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da Silva MAR, Tarakina NV, Filho JBG, Cunha CS, Rocha GFSR, Diab GAA, Ando RA, Savateev O, Agirrezabal-Telleria I, Silva IF, Stolfi S, Ghigna P, Fagnoni M, Ravelli D, Torelli P, Braglia L, Teixeira IF. Single-Atoms on Crystalline Carbon Nitrides for Selective C─H Photooxidation: A Bridge to Achieve Homogeneous Pathways in Heterogeneous Materials. Adv Mater 2023; 35:e2304152. [PMID: 37986204 DOI: 10.1002/adma.202304152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 09/15/2023] [Indexed: 11/22/2023]
Abstract
Single-atom catalysis is a field of paramount importance in contemporary science due to its exceptional ability to combine the domains of homogeneous and heterogeneous catalysis. Iron and manganese metalloenzymes are known to be effective in C─H oxidation reactions in nature, inspiring scientists to mimic their active sites in artificial catalytic systems. Herein, a simple and versatile cation exchange method is successfully employed to stabilize low-cost iron and manganese single-atoms in poly(heptazine imides) (PHI). The resulting materials are employed as photocatalysts for toluene oxidation, demonstrating remarkable selectivity toward benzaldehyde. The protocol is then extended to the selective oxidation of different substrates, including (substituted) alkylaromatics, benzyl alcohols, and sulfides. Detailed mechanistic investigations revealed that iron- and manganese-containing photocatalysts work through a similar mechanism via the formation of high-valent M═O species. Operando X-ray absorption spectroscopy (XAS) is employed to confirm the formation of high-valent iron- and manganese-oxo species, typically found in metalloenzymes involved in highly selective C─H oxidations.
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Affiliation(s)
- Marcos A R da Silva
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Nadezda V Tarakina
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476, Potsdam, Germany
| | - José B G Filho
- Department of Chemistry, ICEx, Federal University of Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Carla S Cunha
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Guilherme F S R Rocha
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Gabriel A A Diab
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
| | - Rômulo Augusto Ando
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000, Brazil
| | - Oleksandr Savateev
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476, Potsdam, Germany
| | - Iker Agirrezabal-Telleria
- Department of Chemical and Environmental Engineering of the Bilbao Engineering School, University of Basque Country (UPV/EHU), Plaza Torres Quevedo 1, Bilbao, 48013, Spain
| | - Ingrid F Silva
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476, Potsdam, Germany
| | - Sara Stolfi
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Paolo Ghigna
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Maurizio Fagnoni
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Davide Ravelli
- Department of Chemistry, University of Pavia, viale Taramelli 12, Pavia, 27100, Italy
| | - Piero Torelli
- TASC Laboratory, CNR-IOM, Istituto Officina dei Materiali, Trieste, 34149, Italy
| | - Luca Braglia
- TASC Laboratory, CNR-IOM, Istituto Officina dei Materiali, Trieste, 34149, Italy
| | - Ivo F Teixeira
- Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil
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2
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Tavani F, Busato M, Veclani D, Braglia L, Mauri S, Torelli P, D'Angelo P. Investigating the High-Temperature Water/MgCl 2 Interface through Ambient Pressure Soft X-ray Absorption Spectroscopy. ACS Appl Mater Interfaces 2023. [PMID: 37199730 DOI: 10.1021/acsami.3c02985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Magnesium chloride is a prototypical deliquescent material whose surface properties, although central for Ziegler-Natta cataysis, have so far remained elusive to experimental characterization. In this work, we use surface-selective X-ray absorption spectroscopy (XAS) at ambient pressure in combination with multivariate curve resolution, molecular dynamics, and XAS theoretical methods to track in real time and accurately describe the interaction between water vapor and the MgCl2 surface. By exposing MgCl2 to water vapor at temperatures between 595 and 391 K, we show that water is preferentially adsorbed on five-coordinated Mg2+ sites in an octahedral configuration, confirming previous theoretical predictions, and find that MgCl2 is capable of retaining a significant amount of adsorbed water even under prolonged heating to 595 K. As a consequence, our work provides first experimental insights into the unique surface affinity of MgCl2 for atmospheric water. The developed technique is proven highly sensitive to the modifications induced by adsorbates on a given low-Z metal based surface and may be useful in the toolbox required to disentangle the mechanisms of interfacial chemical processes.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Matteo Busato
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Daniele Veclani
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), via P. Gobetti 101, 40129 Bologna, Italy
| | - Luca Braglia
- CNR - Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Silvia Mauri
- CNR - Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
- Dipartimento di Fisica, Università di Trieste, Via A. Valerio 2, 34127 Trieste, Italy
| | - Piero Torelli
- CNR - Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Paola D'Angelo
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy
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3
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Boukhvalov DW, D'Olimpio G, Liu J, Ghica C, Istrate MC, Kuo CN, Politano GG, Lue CS, Torelli P, Zhang L, Politano A. Cost-effective, high-performance Ni 3Sn 4 electrocatalysts for methanol oxidation reaction in acidic environments. Chem Commun (Camb) 2023; 59:6040-6043. [PMID: 37185589 DOI: 10.1039/d3cc01623d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Methanol (CH3OH) oxidation offers a promising avenue for transitioning to clean energy, particularly in the field of direct methanol fuel cells (DMFCs). However, the development of efficient and cost-effective catalysts for the methanol oxidation reaction (MOR) remains a critical challenge. Herein, we report the exceptional electrocatalytic activity and stability of Ni3Sn4 toward MOR in acidic media, achieving a performance comparable to that of commercial Pt/C catalysts. Our catalyst design incorporates Earth-abundant Ni and Sn elements, resulting in a material that is 1800 times more cost-effective than Pt/C. Density functional theory (DFT) modeling substantiates our experimental findings, shedding light on the favorable reaction mechanisms and kinetics on the Ni3Sn4 surface. Additionally, the as-synthesized Ni3Sn4 electrocatalyst demonstrates commendable durability, maintaining its electrocatalytic activity even after prolonged exposure to harsh acidic conditions.
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Affiliation(s)
- Danil W Boukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, P. R. China
- Institute of Physics and Technology, Ural Federal University, Mira Str. 19, 620002 Yekaterinburg, Russia
| | - Gianluca D'Olimpio
- Department of Physical and Chemical Sciences, University of L'Aquila, via Vetoio, 67100 L'Aquila (AQ), Italy.
| | - Junzhe Liu
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, P. R. China.
| | - Corneliu Ghica
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | | | - Chia-Nung Kuo
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Grazia Giuseppina Politano
- Department of Information Engineering, Infrastructures and Sustainable Energy (DIIES), University "Mediterranea" of Reggio Calabria, Loc. Feo di Vito, 89122 Reggio Calabria, Italy
| | - Chin Shan Lue
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Piero Torelli
- CNR-IOM, TASC Laboratory, Area Science Park-Basovizza, 34139 Trieste, Italy
| | - Lixue Zhang
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, P. R. China.
| | - Antonio Politano
- Department of Physical and Chemical Sciences, University of L'Aquila, via Vetoio, 67100 L'Aquila (AQ), Italy.
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4
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Rath M, Mezhoud M, El Khaloufi O, Lebedev O, Cardin J, Labbé C, Gourbilleau F, Polewczyk V, Vinai G, Torelli P, Fouchet A, David A, Prellier W, Lüders U. Artificial Aging of Thin Films of the Indium-Free Transparent Conducting Oxide SrVO 3. ACS Appl Mater Interfaces 2023; 15:20240-20251. [PMID: 37067020 DOI: 10.1021/acsami.3c02421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
SrVO3 (SVO) is a prospective candidate to replace the conventional indium tin oxide (ITO) among the new generation of transparent conducting oxide (TCO) materials. In this study, the structural, electrical, and optical properties of SVO thin films, both epitaxial and polycrystalline, are determined during and after heat treatments in the 150-250 °C range and under ambient environment in order to explore the chemical stability of this material. The use of these relatively low temperatures speeds up the natural aging of the films and allows following the evolution of their related properties. The combination of techniques rather sensitive to the film surface and of techniques sampling the film volume will emphasize the presence of a surface oxidation evolving in time at low annealing temperatures, whereas the perovskite phase is destroyed throughout the film for treatments above 200 °C. The present study is designed to understand the thermal degradation and long-term stability issues of vanadate-based TCOs and to identify technologically viable solutions for the application of this group as new TCOs.
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Affiliation(s)
- Martando Rath
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Moussa Mezhoud
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Oualyd El Khaloufi
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Oleg Lebedev
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Julien Cardin
- CIMAP, CNRS, ENSICAEN, UNICAEN, Normandie Univ, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Christophe Labbé
- CIMAP, CNRS, ENSICAEN, UNICAEN, Normandie Univ, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Fabrice Gourbilleau
- CIMAP, CNRS, ENSICAEN, UNICAEN, Normandie Univ, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Vincent Polewczyk
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Giovanni Vinai
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Piero Torelli
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Arnaud Fouchet
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Adrian David
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Wilfrid Prellier
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
| | - Ulrike Lüders
- Normandie Univ, ENSICAEN, UNICAEN, CNRS, CRISMAT, 6, boulevard du Maréchal Juin, F-14050 Caen, France
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Barreau M, Saluso D, Li J, Zhang J, Borfecchia E, Sobczak K, Braglia L, Gallet JJ, Torelli P, Guo H, Lin S, Zafeiratos S. Ionic nickel embedded in ceria with high specific CO2 methanation activity. Angew Chem Int Ed Engl 2023:e202302087. [PMID: 37062698 DOI: 10.1002/anie.202302087] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 04/18/2023]
Abstract
CO2 hydrogenation to methane is gaining increasing interest as one of the most promising ways to store intermittent renewable energy in the form of chemical fuels. Ni particles supported on CeO2 represents a highly efficient, stable and inexpensive catalyst for this reaction. Herein, Ni-doped CeO2 nanoparticles were tested for CO2 methanation showing an extremely high Ni mass-specific activity and CH4 selectivity. Operando characterization reveals that this performance is tightly associated with ionic Νi and Ce3+ surface sites, while formation of metallic Ni does not seem to considerably promote the reaction. Theoretical calculations confirmed the stability of interstitial ionic Ni sites on ceria surfaces and highlighted the role of Ce-O frustrated Lewis pair (FLP), Ni-O classical Lewis pair (CLP) and Ni-Ce pair sites to the activation of H2 and CO2 molecules. To a large extent, the theoretical predictions were validated by in situ spectroscopy under H2 and CO2:H2 gaseous environments.
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Affiliation(s)
- Mathias Barreau
- ICPEES: Institut de Chimie et Procedes pour l'Energie l'Environnement et la Sante, catalysis and materials, FRANCE
| | - Davide Saluso
- European Synchrotron Radiation Facility: ESRF, n/A, FRANCE
| | - Juan Li
- Fuzhou University, n/a, CHINA
| | - Jinming Zhang
- ICPEES: Institut de Chimie et Procedes pour l'Energie l'Environnement et la Sante, catalysis and materials, FRANCE
| | - Elisa Borfecchia
- Università degli Studi di Torino: Universita degli Studi di Torino, n/a, ITALY
| | - Kamil Sobczak
- Warsaw University of Technology: Politechnika Warszawska, n/a, POLAND
| | | | | | | | - Hua Guo
- New Mexico State University, n/a, UNITED STATES
| | - Sen Lin
- Fuzhou University, n/a, CHINA
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6
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Boukhvalov D, D’Olimpio G, Mazzola F, Kuo CN, Mardanya S, Fujii J, Politano GG, Lue CS, Agarwal A, Vobornik I, Torelli P, Politano A. Unveiling the Catalytic Potential of Topological Nodal-Line Semimetal AuSn 4 for Hydrogen Evolution and CO 2 Reduction. J Phys Chem Lett 2023; 14:3069-3076. [PMID: 36947176 PMCID: PMC10068825 DOI: 10.1021/acs.jpclett.3c00113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 03/16/2023] [Indexed: 06/18/2023]
Abstract
In recent years, the correlation between the existence of topological electronic states in materials and their catalytic activity has gained increasing attention, due to the exceptional electron conductivity and charge carrier mobility exhibited by quantum materials. However, the physicochemical mechanisms ruling catalysis with quantum materials are not fully understood. Here, we investigate the chemical reactivity, ambient stability, and catalytic activity of the topological nodal-line semimetal AuSn4. Our findings reveal that the surface of AuSn4 is prone to oxidation, resulting in the formation of a nanometric SnO2 skin. This surface oxidation significantly enhances the material's performance as a catalyst for the hydrogen evolution reaction in acidic environments. We demonstrate that the peculiar atomic structure of oxidized AuSn4 enables the migration of hydrogen atoms through the Sn-O layer with a minimal energy barrier of only 0.19 eV. Furthermore, the Volmer step becomes exothermic in the presence of Sn vacancies or tin-oxide skin, as opposed to being hindered in the pristine sample, with energy values of -0.62 and -1.66 eV, respectively, compared to the +0.46 eV energy barrier in the pristine sample. Our model also suggests that oxidized AuSn4 can serve as a catalyst for the hydrogen evolution reaction in alkali media. Additionally, we evaluate the material's suitability for the carbon dioxide reduction reaction, finding that the presence of topologically protected electronic states enhances the migration of hydrogen atoms adsorbed on the catalyst to carbon dioxide.
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Affiliation(s)
- Danil
W. Boukhvalov
- College
of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, P. R. China
- Institute
of Physics and Technology, Ural Federal
University, Mira Str.
19, 620002 Yekaterinburg, Russia
| | - Gianluca D’Olimpio
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy
| | - Federico Mazzola
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Chia-Nung Kuo
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Sougata Mardanya
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Jun Fujii
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Grazia Giuseppina Politano
- Department
of Information Engineering, Infrastructures and Sustainable Energy
(DIIES), University “Mediterranea”
of Reggio Calabria, Loc. Feo di Vito, 89122 Reggio Calabria, Italy
| | - Chin Shan Lue
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Amit Agarwal
- Department
of Physics, Indian Institute of Technology
Kanpur, Kanpur 208016, India
| | - Ivana Vobornik
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Piero Torelli
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Antonio Politano
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy
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7
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Mauri S, D'Olimpio G, Ghica C, Braglia L, Kuo CN, Istrate MC, Lue CS, Ottaviano L, Klimczuk T, Boukhvalov DW, Politano A, Torelli P. Hydrogen Production Mechanism in Low-Temperature Methanol Decomposition Catalyzed by Ni 3Sn 4 Intermetallic Compound: A Combined Operando and Density Functional Theory Investigation. J Phys Chem Lett 2023; 14:1334-1342. [PMID: 36727689 DOI: 10.1021/acs.jpclett.2c03471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Hydrogen production from methanol decomposition to syngas (H2 + CO) is a promising alternative route for clean energy transition. One major challenge is related to the quest for stable, cost-effective, and selective catalysts operating below 400 °C. We illustrate an investigation of the surface reactivity of a Ni3Sn4 catalyst working at 250 °C, by combining density functional theory, operando X-ray absorption spectroscopy, and high-resolution transmission electron microscopy. We discovered that the catalytic reaction is driven by surface tin-oxide phases, which protects the underlying Ni atoms from irreversible chemical modifications, increasing the catalyst durability. Moreover, we found that Sn content plays a key role in enhancing the H2 selectivity, with respect to secondary products such as CO2. These findings open new perspectives for the engineering of scalable and low-cost catalysts for hydrogen production.
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Affiliation(s)
- Silvia Mauri
- CNR─Istituto Officina dei Materiali, TASC, I-34149Trieste, Italy
- Department of Physics, University of Trieste, Via Valerio 2, 34127Trieste, Italy
| | - Gianluca D'Olimpio
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100L'Aquila, Italy
| | - Corneliu Ghica
- National Institute of Materials Physics, Atomistilor 405A, 077125Magurele, Romania
| | - Luca Braglia
- CNR─Istituto Officina dei Materiali, TASC, I-34149Trieste, Italy
| | - Chia-Nung Kuo
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan70101, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei10601, Taiwan
| | | | - Chin Shan Lue
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan70101, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei10601, Taiwan
| | - Luca Ottaviano
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100L'Aquila, Italy
| | - Tomasz Klimczuk
- Department of Solid-State Physics, Gdansk University of Technology, 80-233Gdansk, Poland
| | - Danil W Boukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing210037, People's Republic of China
| | - Antonio Politano
- Department of Physical and Chemical Sciences, University of L'Aquila, Via Vetoio, 67100L'Aquila, Italy
| | - Piero Torelli
- CNR─Istituto Officina dei Materiali, TASC, I-34149Trieste, Italy
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8
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Altamura C, Ornello R, Ahmed F, Negro A, Miscio AM, Santoro A, Alpuente A, Russo A, Silvestro M, Cevoli S, Brunelli N, Grazzi L, Baraldi C, Guerzoni S, Andreou AP, Lambru G, Frattale I, Kamm K, Ruscheweyh R, Russo M, Torelli P, Filatova E, Latysheva N, Gryglas-Dworak A, Straburzynski M, Butera C, Colombo B, Filippi M, Pozo-Rosich P, Martelletti P, Sacco S, Vernieri F. OnabotulinumtoxinA in elderly patients with chronic migraine: insights from a real-life European multicenter study. J Neurol 2023; 270:986-994. [PMID: 36326890 DOI: 10.1007/s00415-022-11457-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 10/17/2022] [Accepted: 10/25/2022] [Indexed: 11/06/2022]
Abstract
INTRODUCTION Although migraine prevalence decreases with aging, some older patients still suffer from chronic migraine (CM). This study aimed to investigate the outcome of OnabotulinumtoxinA (OBT-A) as preventative therapy in elderly CM patients. METHODS This is a post hoc analysis of real-life prospectively collected data at 16 European headache centers on CM patients treated with OBT-A over the first three treatment cycles (i.e., Cy1-3). We defined: OLD patients aged ≥ 65 years and nonOLD those < 65-year-old. The primary endpoint was the changes in monthly headache days (MHDs) from baseline to Cy 1-3 in OLD compared with nonOLD participants. The secondary endpoints were the responder rate (RR) ≥ 50%, conversion to episodic migraine (EM) and the changes in days with acute medication use (DAMs). RESULTS In a cohort of 2831 CM patients, 235 were OLD (8.3%, 73.2% females, 69.6 years SD 4.7). MHDs decreased from baseline (24.8 SD 6.2) to Cy-1 (17.5 SD 9.1, p < 0.000001), from Cy-1 to Cy-2 (14.8 SD 9.2, p < 0.0001), and from Cy-2 to Cy-3 (11.9 SD 7.9, p = 0.001). DAMs progressively reduced from baseline (19.2 SD 9.8) to Cy-1 (11.9 SD 8.8, p < 0.00001), to Cy-2 (10.9 SD 8.6, p = 0.012), to Cy-3 (9.6 SD 7.4, p = 0.049). The 50%RR increased from 30.7% (Cy-1) to 34.5% (Cy-2), to 38.7% (Cy-3). The above outcome measures did not differ in OLD compared with nonOLD patients. CONCLUSION In a population of elderly CM patients with a long history of migraine OBT-A provided a significant benefit, over the first three treatment cycles, as good as in non-old patients.
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Affiliation(s)
- Claudia Altamura
- Unit of Headache and Neurosonology, Department of Medicine and Surgery, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo, 21, 00128, Rome, Italy.
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 200, 00128, Rome, Italy.
| | - R Ornello
- Neuroscience Section, Department of Applied Clinical Sciences and Biotechnology, University of L'Aquila, Via Vetoio 1 Coppito, 67100, L'Aquila, Italy
| | - F Ahmed
- Department of Neurosciences, Hull University Teaching Hospitals, Hull, UK
| | - A Negro
- Department of Clinical and Molecular Medicine, Faculty of Medicine and Psychology, Sant'Andrea Hospital, Sapienza University, 00189, Rome, RM, Italy
| | - A M Miscio
- Unit of Neurology, Headache Center, Fondazione IRCCS "Casa Sollievo Della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - A Santoro
- Unit of Neurology, Headache Center, Fondazione IRCCS "Casa Sollievo Della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - A Alpuente
- Headache Unit, Department of Neurology, Vall d'Hebron University, Barcelona, Spain
- Headache and Neurological Pain Research Group, Department of Medicine, Vall d'Hebron Institute of Research (VHIR), Universitat Autonoma de Barcelona, Barcelona, Spain
| | - A Russo
- Department of Medical, Surgical, Neurological, Metabolic, and Aging Sciences, Headache Center, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - M Silvestro
- Department of Medical, Surgical, Neurological, Metabolic, and Aging Sciences, Headache Center, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - S Cevoli
- IRCCS Istituto delle scienze Neurologiche di Bologna, Bologna, Italy
| | - N Brunelli
- Unit of Headache and Neurosonology, Department of Medicine and Surgery, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo, 21, 00128, Rome, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 200, 00128, Rome, Italy
| | - L Grazzi
- Neurology Department, Headache Center, IRCCS Foundation "Carlo Besta" Neurological Institute, Via Celoria,11, 20133, Milan, Italy
| | - C Baraldi
- Digital and Predictive Medicine, Pharmacology and Clinical Metabolic Toxicology-Headache Center and Drug Abuse, Laboratory of Clinical Pharmacology and Pharmacogenomics, Department of Specialist Medicines, AOU Policlinico Di Modena, Modena, Italy
| | - S Guerzoni
- Digital and Predictive Medicine, Pharmacology and Clinical Metabolic Toxicology-Headache Center and Drug Abuse, Laboratory of Clinical Pharmacology and Pharmacogenomics, Department of Specialist Medicines, AOU Policlinico Di Modena, Modena, Italy
| | - A P Andreou
- Headache Service, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - G Lambru
- Headache Service, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - I Frattale
- Neuroscience Section, Department of Applied Clinical Sciences and Biotechnology, University of L'Aquila, Via Vetoio 1 Coppito, 67100, L'Aquila, Italy
| | - K Kamm
- Department of Neurology, Ludwig Maximilians University München, Munich, Germany
| | - R Ruscheweyh
- Department of Neurology, Ludwig Maximilians University München, Munich, Germany
- Department of Psychosomatic Medicine and Psychotherapy, Technical University of Munich, Munich, Germany
| | - M Russo
- Neurology Unit, Neuromotor and Rehabilitation Department, Headache Center, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - P Torelli
- Headache Center, University of Parma, Parma, Italy
| | - E Filatova
- Department of Neurology, Institute for Postgraduate Education, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | | | | | - M Straburzynski
- Headache Clinic, Terapia Neurologiczna Samodzielni, Maurycego Mochnackiego 10, 02-042, Warsaw, Poland
| | - C Butera
- Neurophysiology Service, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - B Colombo
- Neurology Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - M Filippi
- Neurophysiology Service, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Neurology Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Neurorehabilitation Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - P Pozo-Rosich
- Headache Unit, Department of Neurology, Vall d'Hebron University, Barcelona, Spain
- Headache and Neurological Pain Research Group, Department of Medicine, Vall d'Hebron Institute of Research (VHIR), Universitat Autonoma de Barcelona, Barcelona, Spain
| | - P Martelletti
- Department of Clinical and Molecular Medicine, Faculty of Medicine and Psychology, Sant'Andrea Hospital, Sapienza University, 00189, Rome, RM, Italy
| | - S Sacco
- Neuroscience Section, Department of Applied Clinical Sciences and Biotechnology, University of L'Aquila, Via Vetoio 1 Coppito, 67100, L'Aquila, Italy
| | - F Vernieri
- Unit of Headache and Neurosonology, Department of Medicine and Surgery, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo, 21, 00128, Rome, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 200, 00128, Rome, Italy
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9
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Salusso D, Mauri S, Deplano G, Torelli P, Bordiga S, Rojas-Buzo S. MOF-Derived CeO 2 and CeZrO x Solid Solutions: Exploring Ce Reduction through FTIR and NEXAFS Spectroscopy. Nanomaterials (Basel) 2023; 13:272. [PMID: 36678025 PMCID: PMC9865843 DOI: 10.3390/nano13020272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 12/30/2022] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
The development of Ce-based materials is directly dependent on the catalyst surface defects, which is caused by the calcination steps required to increase structural stability. At the same time, the evaluation of cerium's redox properties under reaction conditions is of increasing relevant importance. The synthesis of Ce-UiO-66 and CeZr-UiO-66 and their subsequent calcination are presented here as a simple and inexpensive approach for achieving homogeneous and stable CeO2 and CeZrOx nanocrystals. The resulting materials constitute an ideal case study to thoroughly understand cerium redox properties. The Ce3+/Ce4+ redox properties are investigated by H2-TPR experiments exploited by in situ FT-IR and Ce M5-edge AP-NEXAFS spectroscopy. In the latter case, Ce3+ formation is quantified using the MCR-ALS protocol. FT-IR is then presented as a high potential/easily accessible technique for extracting valuable information about the cerium oxidation state under operating conditions. The dependence of the OH stretching vibration frequency on temperature and Ce reduction is described, providing a novel tool for qualitative monitoring of surface oxygen vacancy formation. Based on the reported results, the molecular absorption coefficient of the Ce3+ characteristic IR transition is tentatively evaluated, thus providing a basis for future Ce3+ quantification through FT-IR spectroscopy. Finally, the FT-IR limitations for Ce3+ quantification are discussed.
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Affiliation(s)
- Davide Salusso
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
- European Synchrotron Radiation Facility, CS 40220, CEDEX 9, 38043 Grenoble, France
| | - Silvia Mauri
- IOM CNR Laboratorio TASC, AREA Science Park, Basovizza, 34149 Trieste, Italy
- Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
| | - Gabriele Deplano
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
| | - Piero Torelli
- IOM CNR Laboratorio TASC, AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Silvia Bordiga
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
| | - Sergio Rojas-Buzo
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
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10
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Tavani F, Busato M, Braglia L, Mauri S, Torelli P, D’Angelo P. Caught while Dissolving: Revealing the Interfacial Solvation of the Mg 2+ Ions on the MgO Surface. ACS Appl Mater Interfaces 2022; 14:38370-38378. [PMID: 35968677 PMCID: PMC9412945 DOI: 10.1021/acsami.2c10005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Interfaces between water and materials are ubiquitous and are crucial in materials sciences and in biology, where investigating the interaction of water with the surface under ambient conditions is key to shedding light on the main processes occurring at the interface. Magnesium oxide is a popular model system to study the metal oxide-water interface, where, for sufficient water loadings, theoretical models have suggested that reconstructed surfaces involving hydrated Mg2+ metal ions may be energetically favored. In this work, by combining experimental and theoretical surface-selective ambient pressure X-ray absorption spectroscopy with multivariate curve resolution and molecular dynamics, we evidence in real time the occurrence of Mg2+ solvation at the interphase between MgO and solvating media such as water and methanol (MeOH). Further, we show that the Mg2+ surface ions undergo a reversible solvation process, we prove the dissolution/redeposition of the Mg2+ ions belonging to the MgO surface, and we demonstrate the formation of octahedral [Mg(H2O)6]2+ and [Mg(MeOH)6]2+ intermediate solvated species. The unique surface, electronic, and structural sensitivity of the developed technique may be beneficial to access often elusive properties of low-Z metal ion intermediates involved in interfacial processes of chemical and biological interest.
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Affiliation(s)
- Francesco Tavani
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
| | - Matteo Busato
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
| | - Luca Braglia
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Silvia Mauri
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
- Dipartimento
di Fisica, Università di Trieste, Via A. Valerio 2, 34127 Trieste, Italy
| | - Piero Torelli
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Paola D’Angelo
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, P.le A. Moro 5, 00185 Roma, Italy
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11
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Chaluvadi SK, Polewczyk V, Petrov AY, Vinai G, Braglia L, Diez JM, Pierron V, Perna P, Mechin L, Torelli P, Orgiani P. Electronic Properties of Fully Strained La 1-x Sr x MnO 3 Thin Films Grown by Molecular Beam Epitaxy (0.15 ≤ x ≤ 0.45). ACS Omega 2022; 7:14571-14578. [PMID: 35557663 PMCID: PMC9088787 DOI: 10.1021/acsomega.1c06529] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 02/04/2022] [Indexed: 06/15/2023]
Abstract
The structural, electronic, and magnetic properties of Sr-hole-doped epitaxial La1-x Sr x MnO3 (0.15 ≤ x ≤ 0.45) thin films deposited using the molecular beam epitaxy technique on 4° vicinal STO (001) substrates are probed by the combination of X-ray diffraction and various synchrotron-based spectroscopy techniques. The structural characterizations evidence a significant shift in the LSMO (002) peak to the higher diffraction angles owing to the increase in Sr doping concentrations in thin films. The nature of the LSMO Mn mixed-valence state was estimated from X-ray photoemission spectroscopy together with the relative changes in the Mn L2,3 edges observed in X-ray absorption spectroscopy (XAS), both strongly affected by doping. CTM4XAS simulations at the XAS Mn L2,3 edges reveal the combination of epitaxial strain, and different MnO6 crystal field splitting give rise to a peak at ∼641 eV. The observed changes in the occupancy of the eg and the t2g orbitals as well as their binding energy positions toward the Fermi level with hole doping are discussed. The room-temperature magnetic properties were probed at the end by circular dichroism.
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Affiliation(s)
- Sandeep Kumar Chaluvadi
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Vincent Polewczyk
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Aleksandr Yu Petrov
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Giovanni Vinai
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Luca Braglia
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | | | - Victor Pierron
- Normandie
Univ, UNICAEN, ENSICAEN, CNRS, GREYC (UMR 6072), 14000 Caen, France
| | - Paolo Perna
- IMDEA-Nanociencia, Campus de Cantoblanco, 28049 Madrid, Spain
| | - Laurence Mechin
- Normandie
Univ, UNICAEN, ENSICAEN, CNRS, GREYC (UMR 6072), 14000 Caen, France
| | - Piero Torelli
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Pasquale Orgiani
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
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12
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Celeste A, Brescia R, Greco G, Torelli P, Mauri S, Silvestri L, Pellegrini V, Brutti S. Pushing Stoichiometries of Lithium-Rich Layered Oxides Beyond Their Limits. ACS Appl Energy Mater 2022; 5:1905-1913. [PMID: 35252774 PMCID: PMC8889532 DOI: 10.1021/acsaem.1c03396] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
Lithium-rich layered oxides (LRLOs) are opening unexplored frontiers for high-capacity/high-voltage positive electrodes in Li-ion batteries (LIBs) to meet the challenges of green and safe transportation as well as cheap and sustainable stationary energy storage from renewable sources. LRLOs exploit the extra lithiation provided by the Li1.2TM0.8O2 stoichiometries (TM = a blend of transition metals with a moderate cobalt content) achievable by a layered structure to disclose specific capacities beyond 200-250 mA h g-1 and working potentials in the 3.4-3.8 V range versus Li. Here, we demonstrate an innovative paradigm to extend the LRLO concept. We have balanced the substitution of cobalt in the transition-metal layer of the lattice with aluminum and lithium, pushing the composition of LRLO to unexplored stoichiometries, that is, Li1.2+x (Mn,Ni,Co,Al)0.8-x O2-δ. The fine tuning of the composition of the metal blend results in an optimized layered material, that is, Li1.28Mn0.54Ni0.13Co0.02Al0.03O2-δ, with outstanding electrochemical performance in full LIBs, improved environmental benignity, and reduced manufacturing costs compared to the state-of-the-art.
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Affiliation(s)
- Arcangelo Celeste
- Dipartimento
di Chimica e Chimica Industriale, Università
degli Studi di Genova, via Dodecaneso 31, 16146 Genova, Italy
- Graphene
Labs, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
| | - Rosaria Brescia
- Electron
Microscopy Facility, Istituto Italiano di
Tecnologia, via Morego 30, 16163 Genova, Italy
| | - Giorgia Greco
- Dipartimento
di Chimica, Università di Roma La
Sapienza, p.le Aldo Moro
5, 00185 Roma, Italy
| | - Piero Torelli
- Laboratorio
TASC, Istituto Officina dei Materiali (IOM)−CNR, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Silvia Mauri
- Laboratorio
TASC, Istituto Officina dei Materiali (IOM)−CNR, Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
- Dipartimento
di Fisica, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | - Laura Silvestri
- Dipartimento
di Tecnologie Energetiche e Fonti Rinnovabili, ENEA C.R. Casaccia, via Anguillarese 301, 00123 Roma, Italy
| | - Vittorio Pellegrini
- Graphene
Labs, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
- BeDimensional
Spa, via Torrentesecca
3d, 16163 Genova, Italy
| | - Sergio Brutti
- Dipartimento
di Chimica, Università di Roma La
Sapienza, p.le Aldo Moro
5, 00185 Roma, Italy
- GISEL—Centro
di Riferimento Nazionale per i Sistemi di Accumulo Elettrochimico
di Energia, INSTM, via
G. Giusti, 50121 Firenze, Italy
- ISC-CNR OUS Sapienza, Via dei Tarquini, 00185 Roma, Italy
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13
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Tavani F, Fracchia M, Tofoni A, Braglia L, Jouve A, Morandi S, Manzoli M, Torelli P, Ghigna P, D'Angelo P. Structural and mechanistic insights into low-temperature CO oxidation over a prototypical high entropy oxide by Cu L-edge operando soft X-ray absorption spectroscopy. Phys Chem Chem Phys 2021; 23:26575-26584. [PMID: 34812450 DOI: 10.1039/d1cp03946f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High entropy oxides (HEOs) are an emerging class of materials constituted by multicomponent systems that are receiving special interest as candidates for obtaining novel and desirable properties. In this study we present a detailed investigation of the relevant intermediates arising at the surface of the prototypical HEO Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O during low-temperature CO oxidation. By combining Cu L2,3-edge operando soft X-ray absorption spectroscopy (soft-XAS) with density functional theory simulations and in situ FT-IR spectroscopy, we propose that upon HEO exposure to CO at 235 °C reduced Cu(I) sites arise mostly coordinated to activated CO molecules and partly to bidentate carbonate species. When the HEO surface is then exposed to a stoichiometric mixture of CO + 1/2O2 at 250 °C, CO2 is produced while bidentate carbonate moieties remain interacting with the Cu(I) sites. We structurally characterize the carbonate and CO preferential adsorption geometries on the Cu(I) surface metal centers, and find that CO adopts a bent conformation that may energetically favor its subsequent oxidation. The unique surface, structural and electronic sensitivity of soft-XAS coupled with the developed data analysis work-flow and supported by FT-IR spectroscopy may be beneficial to characterize often elusive surface properties of systems of catalytic interest.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Martina Fracchia
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 16, 27100 Pavia, Italy
| | - Alessandro Tofoni
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Luca Braglia
- CNR - Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Andrea Jouve
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via P. Giuria 9, 10125, Torino, Italy
| | - Sara Morandi
- Dipartimento di Chimica, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy
| | - Maela Manzoli
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via P. Giuria 9, 10125, Torino, Italy
| | - Piero Torelli
- CNR - Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Paolo Ghigna
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 16, 27100 Pavia, Italy
| | - Paola D'Angelo
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
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14
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Dmitriyeva A, Mikheev V, Zarubin S, Chouprik A, Vinai G, Polewczyk V, Torelli P, Matveyev Y, Schlueter C, Karateev I, Yang Q, Chen Z, Tao L, Tsymbal EY, Zenkevich A. Magnetoelectric Coupling at the Ni/Hf 0.5Zr 0.5O 2 Interface. ACS Nano 2021; 15:14891-14902. [PMID: 34468129 DOI: 10.1021/acsnano.1c05001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Composite multiferroics containing ferroelectric and ferromagnetic components often have much larger magnetoelectric coupling compared to their single-phase counterparts. Doped or alloyed HfO2-based ferroelectrics may serve as a promising component in composite multiferroic structures potentially feasible for technological applications. Recently, a strong charge-mediated magnetoelectric coupling at the Ni/HfO2 interface has been predicted using density functional theory calculations. Here, we report on the experimental evidence of such magnetoelectric coupling at the Ni/Hf0.5Zr0.5O2(HZO) interface. Using a combination of operando XAS/XMCD and HAXPES/MCDAD techniques, we probe element-selectively the local magnetic properties at the Ni/HZO interface in functional Au/Co/Ni/HZO/W capacitors and demonstrate clear evidence of the ferroelectric polarization effect on the magnetic response of a nanometer-thick Ni marker layer. The observed magnetoelectric effect and the electronic band lineup of the Ni/HZO interface are interpreted based on the results of our theoretical modeling. It elucidates the critical role of an ultrathin NiO interlayer, which controls the sign of the magnetoelectric effect as well as provides a realistic band offset at the Ni/HZO interface, in agreement with the experiment. Our results hold promise for the use of ferroelectric HfO2-based composite multiferroics for the design of multifunctional devices compatible with modern semiconductor technology.
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Affiliation(s)
- Anna Dmitriyeva
- Moscow Institute of Physics and Technology, 9, Institutskiy lane, Dolgoprudny, Moscow Region, 141700, Russia
| | - Vitalii Mikheev
- Moscow Institute of Physics and Technology, 9, Institutskiy lane, Dolgoprudny, Moscow Region, 141700, Russia
| | - Sergei Zarubin
- Moscow Institute of Physics and Technology, 9, Institutskiy lane, Dolgoprudny, Moscow Region, 141700, Russia
| | - Anastasia Chouprik
- Moscow Institute of Physics and Technology, 9, Institutskiy lane, Dolgoprudny, Moscow Region, 141700, Russia
| | - Giovanni Vinai
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, Trieste I-34149, Italy
| | - Vincent Polewczyk
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, Trieste I-34149, Italy
| | - Piero Torelli
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, Trieste I-34149, Italy
| | - Yury Matveyev
- Deutsches Elektronen-Synchrotron, 85 Notkestraße, Hamburg, D-22607, Germany
| | | | - Igor Karateev
- National Research Center "Kurchatov Institute", Moscow, 123182, Russia
| | - Qiong Yang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
| | - Zhaojin Chen
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
| | - Lingling Tao
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Evgeny Y Tsymbal
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Andrei Zenkevich
- Moscow Institute of Physics and Technology, 9, Institutskiy lane, Dolgoprudny, Moscow Region, 141700, Russia
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15
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Braglia L, Tavani F, Mauri S, Edla R, Krizmancic D, Tofoni A, Colombo V, D’Angelo P, Torelli P. Catching the Reversible Formation and Reactivity of Surface Defective Sites in Metal-Organic Frameworks: An Operando Ambient Pressure-NEXAFS Investigation. J Phys Chem Lett 2021; 12:9182-9187. [PMID: 34528795 PMCID: PMC9282676 DOI: 10.1021/acs.jpclett.1c02585] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this work, we apply for the first time ambient pressure operando soft X-ray absorption spectroscopy (XAS) to investigate the location, structural properties, and reactivity of the defective sites present in the prototypical metal-organic framework HKUST-1. We obtained direct evidence that Cu+ defective sites form upon temperature treatment of the powdered form of HKUST-1 at 160 °C and that they are largely distributed on the material surface. Further, a thorough structural characterization of the Cu+/Cu2+ dimeric complexes arising from the temperature-induced dehydration/decarboxylation of the pristine Cu2+/Cu2+ paddlewheel units is reported. In addition to characterizing the surface defects, we demonstrate that CO2 may be reversibly adsorbed and desorbed from the surface defective Cu+/Cu2+ sites. These findings show that ambient pressure soft-XAS, combined with state-of-the-art theoretical calculations, allowed us to shed light on the mechanism involving the decarboxylation of the paddlewheel units on the surface to yield Cu+/Cu2+ complexes and their reversible restoration upon exposure to gaseous CO2.
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Affiliation(s)
- Luca Braglia
- CNR-Istituto
Officina dei Materiali, TASC, 34149 Trieste, Italy
| | - Francesco Tavani
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Silvia Mauri
- CNR-Istituto
Officina dei Materiali, TASC, 34149 Trieste, Italy
| | - Raju Edla
- CNR-Istituto
Officina dei Materiali, TASC, 34149 Trieste, Italy
- Institute
for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344, Eggenstein-Leopoldshafen, Germany
| | | | - Alessandro Tofoni
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Valentina Colombo
- Dipartimento
di Chimica, Università degli Studi
di Milano, Via Golgi 19, 20133 Milan, Italy
| | - Paola D’Angelo
- Dipartimento
di Chimica, Università di Roma “La
Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Piero Torelli
- CNR-Istituto
Officina dei Materiali, TASC, 34149 Trieste, Italy
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16
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Polewczyk V, Magrin Maffei R, Vinai G, Lo Cicero M, Prato S, Capaldo P, Dal Zilio S, di Bona A, Paolicelli G, Mescola A, D’Addato S, Torelli P, Benedetti S. ZnO Thin Films Growth Optimization for Piezoelectric Application. Sensors (Basel) 2021; 21:6114. [PMID: 34577322 PMCID: PMC8472809 DOI: 10.3390/s21186114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/02/2021] [Accepted: 09/08/2021] [Indexed: 01/10/2023]
Abstract
The piezoelectric response of ZnO thin films in heterostructure-based devices is strictly related to their structure and morphology. We optimize the fabrication of piezoelectric ZnO to reduce its surface roughness, improving the crystalline quality, taking into consideration the role of the metal electrode underneath. The role of thermal treatments, as well as sputtering gas composition, is investigated by means of atomic force microscopy and x-ray diffraction. The results show an optimal reduction in surface roughness and at the same time a good crystalline quality when 75% O2 is introduced in the sputtering gas and deposition is performed between room temperature and 573 K. Subsequent annealing at 773 K further improves the film quality. The introduction of Ti or Pt as bottom electrode maintains a good surface and crystalline quality. By means of piezoelectric force microscope, we prove a piezoelectric response of the film in accordance with the literature, in spite of the low ZnO thickness and the reduced grain size, with a unipolar orientation and homogenous displacement when deposited on Ti electrode.
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Affiliation(s)
- Vincent Polewczyk
- Laboratorio TASC, Istituto Officina dei Materiali (IOM)-CNR, 34149 Trieste, Italy; (G.V.); (P.C.); (S.D.Z.); (P.T.)
| | - Riccardo Magrin Maffei
- Istituto Nanoscienze-CNR, Via Campi 213/a, 41125 Modena, Italy; (R.M.M.); (A.d.B.); (G.P.); (A.M.); (S.D.)
- Dipartimento di Scienze Fisiche Informatiche Matematiche, Università di Modena e Reggio Emilia, Via Campi 213/a, 41125 Modena, Italy
| | - Giovanni Vinai
- Laboratorio TASC, Istituto Officina dei Materiali (IOM)-CNR, 34149 Trieste, Italy; (G.V.); (P.C.); (S.D.Z.); (P.T.)
| | - Matteo Lo Cicero
- A.P.E. Research srl, Area Science Park, Basovizza, ss14 Km 163.5, 34149 Trieste, Italy; (M.L.C.); (S.P.)
| | - Stefano Prato
- A.P.E. Research srl, Area Science Park, Basovizza, ss14 Km 163.5, 34149 Trieste, Italy; (M.L.C.); (S.P.)
| | - Pietro Capaldo
- Laboratorio TASC, Istituto Officina dei Materiali (IOM)-CNR, 34149 Trieste, Italy; (G.V.); (P.C.); (S.D.Z.); (P.T.)
- Dipartimento di Fisica e Astronomia, Università di Padova, Via F Marzolo 8, 35131 Padova, Italy
| | - Simone Dal Zilio
- Laboratorio TASC, Istituto Officina dei Materiali (IOM)-CNR, 34149 Trieste, Italy; (G.V.); (P.C.); (S.D.Z.); (P.T.)
| | - Alessandro di Bona
- Istituto Nanoscienze-CNR, Via Campi 213/a, 41125 Modena, Italy; (R.M.M.); (A.d.B.); (G.P.); (A.M.); (S.D.)
| | - Guido Paolicelli
- Istituto Nanoscienze-CNR, Via Campi 213/a, 41125 Modena, Italy; (R.M.M.); (A.d.B.); (G.P.); (A.M.); (S.D.)
| | - Andrea Mescola
- Istituto Nanoscienze-CNR, Via Campi 213/a, 41125 Modena, Italy; (R.M.M.); (A.d.B.); (G.P.); (A.M.); (S.D.)
| | - Sergio D’Addato
- Istituto Nanoscienze-CNR, Via Campi 213/a, 41125 Modena, Italy; (R.M.M.); (A.d.B.); (G.P.); (A.M.); (S.D.)
- Dipartimento di Scienze Fisiche Informatiche Matematiche, Università di Modena e Reggio Emilia, Via Campi 213/a, 41125 Modena, Italy
| | - Piero Torelli
- Laboratorio TASC, Istituto Officina dei Materiali (IOM)-CNR, 34149 Trieste, Italy; (G.V.); (P.C.); (S.D.Z.); (P.T.)
| | - Stefania Benedetti
- Istituto Nanoscienze-CNR, Via Campi 213/a, 41125 Modena, Italy; (R.M.M.); (A.d.B.); (G.P.); (A.M.); (S.D.)
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17
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Piovano A, Signorile M, Braglia L, Torelli P, Martini A, Wada T, Takasao G, Taniike T, Groppo E. Electronic Properties of Ti Sites in Ziegler–Natta Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01735] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alessandro Piovano
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
| | - Matteo Signorile
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
| | | | | | - Andrea Martini
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russia
| | - Toru Wada
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Gentoku Takasao
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Toshiaki Taniike
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Elena Groppo
- Department of Chemistry, INSTM and NIS Centre, University of Torino, Via Giuria 7, 10125 Torino, Italy
- DPI, P.O.
Box 902, 5600 AX Eindhoven, The Netherlands
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18
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Giaconi N, Sorrentino AL, Poggini L, Lupi M, Polewczyk V, Vinai G, Torelli P, Magnani A, Sessoli R, Menichetti S, Sorace L, Viglianisi C, Mannini M. Stabilization of an Enantiopure Sub-monolayer of Helicene Radical Cations on a Au(111) Surface through Noncovalent Interactions. Angew Chem Int Ed Engl 2021; 60:15276-15280. [PMID: 33904633 PMCID: PMC8362206 DOI: 10.1002/anie.202103710] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/15/2021] [Indexed: 12/16/2022]
Abstract
In the past few years, the chirality and magnetism of molecules have received notable interest for the development of novel molecular devices. Chiral helicenes combine both these properties, and thus their nanostructuration is the first step toward developing new multifunctional devices. Here, we present a novel strategy to deposit a sub‐monolayer of enantiopure thia[4]helicene radical cations on a pre‐functionalized Au(111) substrate. This approach results in both the paramagnetic character and the chemical structure of these molecules being maintained at the nanoscale, as demonstrated by in‐house characterizations. Furthermore, synchrotron‐based X‐ray natural circular dichroism confirmed that the handedness of the thia[4]helicene is preserved on the surface.
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Affiliation(s)
- Niccolò Giaconi
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy.,Department of Industrial Engineering and INSTM Research Unit, University of Florence, Via Santa Marta 3, 50139, Florence, Italy
| | - Andrea Luigi Sorrentino
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy.,Department of Industrial Engineering and INSTM Research Unit, University of Florence, Via Santa Marta 3, 50139, Florence, Italy
| | - Lorenzo Poggini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy.,Istituto di Chimica dei Composti Organometallici (ICCOM), CNR, Via Madonna del Piano, 10, 50019, Sesto Fiorentino, Italy
| | - Michela Lupi
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Vincent Polewczyk
- Istituto Officina dei Materiali (IOM), CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, 34149, Trieste, Italy
| | - Giovanni Vinai
- Istituto Officina dei Materiali (IOM), CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, 34149, Trieste, Italy
| | - Piero Torelli
- Istituto Officina dei Materiali (IOM), CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, 34149, Trieste, Italy
| | - Agnese Magnani
- Department of Biotechnology, Chemistry and Pharmacy and INSTM Research Unit, University of Siena, Via Aldo Moro 2, 53100, Siena, Italy
| | - Roberta Sessoli
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Lorenzo Sorace
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Caterina Viglianisi
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Matteo Mannini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
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19
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Sygletou M, Benedetti S, Ferrera M, Pierantozzi GM, Cucini R, Della Valle G, Carrara P, De Vita A, di Bona A, Torelli P, Catone D, Panaccione G, Canepa M, Bisio F. Quantitative Ultrafast Electron-Temperature Dynamics in Photo-Excited Au Nanoparticles. Small 2021; 17:e2100050. [PMID: 34061425 DOI: 10.1002/smll.202100050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 04/16/2021] [Indexed: 06/12/2023]
Abstract
The femtosecond evolution of the electronic temperature of laser-excited gold nanoparticles is measured, by means of ultrafast time-resolved photoemission spectroscopy induced by extreme-ultraviolet radiation pulses. The temperature of the electron gas is deduced by recording and fitting high-resolution photo emission spectra around the Fermi edge of gold nanoparticles providing a direct, unambiguous picture of the ultrafast electron-gas dynamics. These results will be instrumental to the refinement of existing models of femtosecond processes in laterally-confined and bulk condensed-matter systems, and for understanding more deeply the role of hot electrons in technological applications.
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Affiliation(s)
- Maria Sygletou
- OptMatLab, Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146, Genova, Italy
| | | | - Marzia Ferrera
- OptMatLab, Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146, Genova, Italy
| | - Gian Marco Pierantozzi
- Istituto Officina dei Materiali-CNR, Laboratorio TASC, Area Science Park, S.S. 14, Km 163.5, Trieste, I-34149, Italy
| | - Riccardo Cucini
- Istituto Officina dei Materiali-CNR, Laboratorio TASC, Area Science Park, S.S. 14, Km 163.5, Trieste, I-34149, Italy
| | - Giuseppe Della Valle
- Dipartimento di Fisica, IFN-CNR, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133, Milano, Italy
| | - Pietro Carrara
- Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, Milano, Italy
| | - Alessandro De Vita
- Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, Milano, Italy
| | | | - Piero Torelli
- Istituto Officina dei Materiali-CNR, Laboratorio TASC, Area Science Park, S.S. 14, Km 163.5, Trieste, I-34149, Italy
| | - Daniele Catone
- Istituto di Struttura della Materia - CNR (ISM-CNR), EuroFEL Support Laboratory (EFSL), Via del Fosso del Cavaliere, 100, I-00133, Rome, Italy
| | - Giancarlo Panaccione
- Istituto Officina dei Materiali-CNR, Laboratorio TASC, Area Science Park, S.S. 14, Km 163.5, Trieste, I-34149, Italy
| | - Maurizio Canepa
- OptMatLab, Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146, Genova, Italy
| | - Francesco Bisio
- CNR-SPIN Istituto Superconduttori Materiali Innovativi e Dispositivi, C.so Perrone 24, I-16152, Genova, Italy
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20
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Boukhvalov DW, Kuo CN, Nappini S, Marchionni A, D’Olimpio G, Filippi J, Mauri S, Torelli P, Lue CS, Vizza F, Politano A. Efficient Electrochemical Water Splitting with PdSn 4 Dirac Nodal Arc Semimetal. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01653] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Danil W. Boukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, P. R. China
- Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia
| | - Chia-Nung Kuo
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Silvia Nappini
- Consiglio Nazionale delle Ricerche (CNR)-Istituto Officina dei Materiali (IOM), Laboratorio TASC, Area Science Park S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Andrea Marchionni
- Consiglio Nazionale delle Ricerche (CNR)-Istituto di Chimica dei Composti OrganoMetallici (ICCOM), Area della Ricerca di Firenze, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Gianluca D’Olimpio
- INSTM and Department of Physical and Chemical Sciences, University of L’Aquila, via Vetoio, 67100 L’Aquila, Abruzzo, Italy
| | - Jonathan Filippi
- Consiglio Nazionale delle Ricerche (CNR)-Istituto di Chimica dei Composti OrganoMetallici (ICCOM), Area della Ricerca di Firenze, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Silvia Mauri
- Consiglio Nazionale delle Ricerche (CNR)-Istituto Officina dei Materiali (IOM), Laboratorio TASC, Area Science Park S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Piero Torelli
- Consiglio Nazionale delle Ricerche (CNR)-Istituto Officina dei Materiali (IOM), Laboratorio TASC, Area Science Park S.S. 14 km 163.5, 34149 Trieste, Italy
- Elettra-Sincrotrone S.C.p.A, S.S. 14 km 163.5 in Area Science Park, 34149 Trieste, Italy
| | - Chin Shan Lue
- Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Francesco Vizza
- Consiglio Nazionale delle Ricerche (CNR)-Istituto di Chimica dei Composti OrganoMetallici (ICCOM), Area della Ricerca di Firenze, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Antonio Politano
- INSTM and Department of Physical and Chemical Sciences, University of L’Aquila, via Vetoio, 67100 L’Aquila, Abruzzo, Italy
- CNR-IMM Istituto per la Microelettronica e Microsistemi, VIII strada 5, I-95121 Catania, Italy
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21
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Shi Y, Wang L, Wang Z, Vinai G, Braglia L, Torelli P, Aruta C, Traversa E, Liu W, Yang N. Defect Engineering for Tuning the Photoresponse of Ceria-Based Solid Oxide Photoelectrochemical Cells. ACS Appl Mater Interfaces 2021; 13:541-551. [PMID: 33373206 DOI: 10.1021/acsami.0c17921] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Solid oxide photoelectrochemical cells (SOPECs) with inorganic ion-conducting electrolytes provide an alternative solution for light harvesting and conversion. Exploring potential photoelectrodes for SOPECs and understanding their operation mechanisms are crucial for continuously developing this technology. Here, ceria-based thin films were newly explored as photoelectrodes for SOPEC applications. It was found that the photoresponse of ceria-based thin films can be tuned both by Sm-doping-induced defects and by the heating temperature of SOPECs. The whole process was found to depend on the surface electrochemical redox reactions synergistically with the bulk photoelectric effect. Samarium doping level can selectively switch the open-circuit voltages polarity of SOPECs under illumination, thus shifting the potential of photoelectrodes and changing their photoresponse. The role of defect chemistry engineering in determining such a photoelectrochemical process was discussed. Transient absorption and X-ray photoemission spectroscopies, together with the state-of-the-art in operando X-ray absorption spectroscopy, allowed us to provide a compelling explanation of the experimentally observed switching behavior on the basis of the surface reactions and successive charge balance in the bulk.
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Affiliation(s)
- Yanuo Shi
- Electrochemical Thin Film Group, School of Physical Science and Technology, ShanghaiTech University, Shanghai, P.R. China
| | - Luyao Wang
- Electrochemical Thin Film Group, School of Physical Science and Technology, ShanghaiTech University, Shanghai, P.R. China
| | - Ziyu Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, P.R. China
| | - Giovanni Vinai
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, Trieste I-34149, Italy
| | - Luca Braglia
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, Trieste I-34149, Italy
| | - Piero Torelli
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, Trieste I-34149, Italy
| | - Carmela Aruta
- CNR-SPIN, c/o Università di Roma Tor Vergata, Via del Politecnico, 1 Rome 00133, Italy
| | - Enrico Traversa
- School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Road, Chengdu, Sichuan 611731, P.R. China
| | - Weimin Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, P.R. China
| | - Nan Yang
- Electrochemical Thin Film Group, School of Physical Science and Technology, ShanghaiTech University, Shanghai, P.R. China
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22
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D’Olimpio G, Genuzio F, Menteş TO, Paolucci V, Kuo CN, Al Taleb A, Lue CS, Torelli P, Farías D, Locatelli A, Boukhvalov DW, Cantalini C, Politano A. Charge Redistribution Mechanisms in SnSe 2 Surfaces Exposed to Oxidative and Humid Environments and Their Related Influence on Chemical Sensing. J Phys Chem Lett 2020; 11:9003-9011. [PMID: 33035062 PMCID: PMC8015219 DOI: 10.1021/acs.jpclett.0c02616] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 10/01/2020] [Indexed: 06/11/2023]
Abstract
Tin diselenide (SnSe2) is a van der Waals semiconductor, which spontaneously forms a subnanometric SnO2 skin once exposed to air. Here, by means of surface-science spectroscopies and density functional theory, we have investigated the charge redistribution at the SnO2-SnSe2 heterojunction in both oxidative and humid environments. Explicitly, we find that the work function of the pristine SnSe2 surface increases by 0.23 and 0.40 eV upon exposure to O2 and air, respectively, with a charge transfer reaching 0.56 e-/SnO2 between the underlying SnSe2 and the SnO2 skin. Remarkably, both pristine SnSe2 and defective SnSe2 display chemical inertness toward water, in contrast to other metal chalcogenides. Conversely, the SnO2-SnSe2 interface formed upon surface oxidation is highly reactive toward water, with subsequent implications for SnSe2-based devices working in ambient humidity, including chemical sensors. Our findings also imply that recent reports on humidity sensing with SnSe2 should be reinterpreted, considering the pivotal role of the oxide skin in the interaction with water molecules.
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Affiliation(s)
- Gianluca D’Olimpio
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via Vetoio, 67100 L’Aquila, AQ, Italy
| | - Francesca Genuzio
- Elettra-Sincrotrone
S.C.p.A., S.S. 14-km 163.5 in AREA Science Park, 34149 Trieste, Italy
| | - Tevfik Onur Menteş
- Elettra-Sincrotrone
S.C.p.A., S.S. 14-km 163.5 in AREA Science Park, 34149 Trieste, Italy
| | - Valentina Paolucci
- Department
of Industrial and Information Engineering and Economics, University of L’Aquila, Via G. Gronchi 18, I-67100 L’Aquila, Italy
| | - Chia-Nung Kuo
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Amjad Al Taleb
- Departamento
de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Chin Shan Lue
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Piero Torelli
- Elettra-Sincrotrone
S.C.p.A., S.S. 14-km 163.5 in AREA Science Park, 34149 Trieste, Italy
- Consiglio
Nazionale delle Ricerche (CNR)-Istituto Officina dei Materiali (IOM), Laboratorio TASC in Area Science
Park S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Daniel Farías
- Departamento
de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Instituto
‘Nicolás Cabrera’, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Condensed
Matter Physics Center (IFIMAC), Universidad
Autónoma de Madrid, 28049 Madrid, Spain
| | - Andrea Locatelli
- Elettra-Sincrotrone
S.C.p.A., S.S. 14-km 163.5 in AREA Science Park, 34149 Trieste, Italy
| | - Danil W. Boukhvalov
- College
of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, P. R. China
- Theoretical
Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia
| | - Carlo Cantalini
- Department
of Industrial and Information Engineering and Economics, University of L’Aquila, Via G. Gronchi 18, I-67100 L’Aquila, Italy
| | - Antonio Politano
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via Vetoio, 67100 L’Aquila, AQ, Italy
- CNR-IMM
Istituto per la Microelettronica e Microsistemi, VIII strada 5, I-95121 Catania, Italy
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23
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Simonne DH, Martini A, Signorile M, Piovano A, Braglia L, Torelli P, Borfecchia E, Ricchiardi G. THORONDOR: a software for fast treatment and analysis of low-energy XAS data. J Synchrotron Radiat 2020; 27:1741-1752. [PMID: 33147203 DOI: 10.1107/s1600577520011388] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
THORONDOR is a data treatment software with a graphical user interface (GUI) accessible via the browser-based Jupyter notebook framework. It aims to provide an interactive and user-friendly tool for the analysis of NEXAFS spectra collected during in situ experiments. The program allows on-the-fly representation and quick correction of large datasets from single or multiple experiments. In particular, it provides the possibility to align in energy several spectral profiles on the basis of user-defined references. Various techniques to calculate background subtraction and signal normalization have been made available. In this context, an innovation of this GUI involves the usage of a slider-based approach that provides the ability to instantly manipulate and visualize processed data for the user. Finally, the program is characterized by an advanced fitting toolbox based on the lmfit package. It offers a large selection of fitting routines as well as different peak distributions and empirical ionization potential step edges, which can be used for the fit of the NEXAFS rising-edge peaks. Statistical parameters describing the goodness of a fit such as χ2 or the R-factor together with the parameter uncertainty distributions and the related correlations can be extracted for each chosen model.
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Affiliation(s)
- David Horst Simonne
- Department of Chemistry, INSTM Reference Center and NIS and CrisDi Interdepartmental Centers, University of Torino, Via P. Giuria 7, Torino 10125, Italy
| | - Andrea Martini
- Department of Chemistry, INSTM Reference Center and NIS and CrisDi Interdepartmental Centers, University of Torino, Via P. Giuria 7, Torino 10125, Italy
| | - Matteo Signorile
- Department of Chemistry, INSTM Reference Center and NIS and CrisDi Interdepartmental Centers, University of Torino, Via P. Giuria 7, Torino 10125, Italy
| | - Alessandro Piovano
- Department of Chemistry, INSTM Reference Center and NIS and CrisDi Interdepartmental Centers, University of Torino, Via P. Giuria 7, Torino 10125, Italy
| | - Luca Braglia
- CNR-IOM, TASC Laboratory, SS 14 km 163.5, Trieste 34149, Italy
| | - Piero Torelli
- CNR-IOM, TASC Laboratory, SS 14 km 163.5, Trieste 34149, Italy
| | - Elisa Borfecchia
- Department of Chemistry, INSTM Reference Center and NIS and CrisDi Interdepartmental Centers, University of Torino, Via P. Giuria 7, Torino 10125, Italy
| | - Gabriele Ricchiardi
- Department of Chemistry, INSTM Reference Center and NIS and CrisDi Interdepartmental Centers, University of Torino, Via P. Giuria 7, Torino 10125, Italy
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24
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Yang N, Knez D, Vinai G, Torelli P, Ciancio R, Orgiani P, Aruta C. Improved Structural Properties in Homogeneously Doped Sm 0.4Ce 0.6O 2-δ Epitaxial Thin Films: High Doping Effect on the Electronic Bands. ACS Appl Mater Interfaces 2020; 12:47556-47563. [PMID: 32985188 DOI: 10.1021/acsami.0c13495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The study of ionic materials on nanometer scale is of great relevance for efficient miniaturized devices for energy applications. The epitaxial growth of thin films can be a valid route to tune the properties of the materials and thus obtain new degrees of freedom in materials design. High crystal quality SmxCe1-xO2-δ films are here reported at a high doping level up to x = 0.4, thanks to the good lattice matching with the (110) oriented NdGaO3 substrate. X-ray diffraction and transmission electron microscopy demonstrate the ordered structural quality and absence of Sm segregation at the macroscopic and atomic level, respectively. Therefore, in epitaxial thin films, the homogeneous doping can be obtained even with the high dopant content not always approachable in bulk form, getting even an improvement of the structural properties. In situ spectroscopic measurements by X-ray photoemission and X-ray absorption show the O 2p band shift toward the Fermi level, which can favor the oxygen exchange and vacancy formation on the surface when the Sm doping is increased to x = 0.4. X-ray absorption spectroscopy also confirms the absence of ordered oxygen vacancy clusters and further reveals that the 5d eg and t2g states are well separated by the crystal field in the undistorted local structure even in the case of a high doping level up to x = 0.4.
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Affiliation(s)
- Nan Yang
- School of Physical Science and Technology, ShanghaiTech University, 201210 Shanghai, China
| | - Daniel Knez
- CNR-IOM, TASC National Laboratory, I-34149 Trieste, Italy
| | - Giovanni Vinai
- CNR-IOM, TASC National Laboratory, I-34149 Trieste, Italy
| | - Piero Torelli
- CNR-IOM, TASC National Laboratory, I-34149 Trieste, Italy
| | - Regina Ciancio
- CNR-IOM, TASC National Laboratory, I-34149 Trieste, Italy
| | - Pasquale Orgiani
- CNR-IOM, TASC National Laboratory, I-34149 Trieste, Italy
- CNR-SPIN c/o University of Salerno, I-84084 Fisciano, Italy
| | - Carmela Aruta
- CNR-SPIN c/o University of Roma Tor Vergata, I-00133 Rome, Italy
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25
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Signorile M, Braglia L, Crocellà V, Torelli P, Groppo E, Ricchiardi G, Bordiga S, Bonino F. Titanium Defective Sites in TS‐1: Structural Insights by Combining Spectroscopy and Simulation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Matteo Signorile
- Department of Chemistry, NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 10125 Torino Italy
| | - Luca Braglia
- TASC Laboratory, IOM-CNR S.S. 14 km 163.5 Basovizza 34149 Trieste Italy
| | - Valentina Crocellà
- Department of Chemistry, NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 10125 Torino Italy
| | - Piero Torelli
- TASC Laboratory, IOM-CNR S.S. 14 km 163.5 Basovizza 34149 Trieste Italy
| | - Elena Groppo
- Department of Chemistry, NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 10125 Torino Italy
| | - Gabriele Ricchiardi
- Department of Chemistry, NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 10125 Torino Italy
| | - Silvia Bordiga
- Department of Chemistry, NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 10125 Torino Italy
- Center for Materials Science and Nanotechnology (SMN), Department of Chemistry University of Oslo 1033 Blindern 0315 Oslo Norway
| | - Francesca Bonino
- Department of Chemistry, NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 10125 Torino Italy
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26
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Signorile M, Braglia L, Crocellà V, Torelli P, Groppo E, Ricchiardi G, Bordiga S, Bonino F. Titanium Defective Sites in TS-1: Structural Insights by Combining Spectroscopy and Simulation. Angew Chem Int Ed Engl 2020; 59:18145-18150. [PMID: 32648335 DOI: 10.1002/anie.202005841] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 06/29/2020] [Indexed: 11/07/2022]
Abstract
Ti silicates, and in particular, titanium silicalite-1 (TS-1), are nowadays important catalysts for several partial oxidation reactions in the presence of aqueous H2 O2 as an oxidant. Despite the numerous studies dealing with this material, some fundamental aspects are still unclear. In particular, the structure and the catalytic role of defective Ti sites, other than perfect tetrahedral sites recognized as the main active species, has not been quantitatively discussed in the literature. We assess the structural features of defective Ti sites on the basis of outcomes of electronic spectroscopies, as interpreted through quantum mechanical simulation. Strong evidence is disclosed to support the fact that the most common defective Ti sites, often reported in the TS-1 literature, are monomeric Ti centers that are embedded in the zeolite framework, and which have a distorted octahedral local symmetry.
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Affiliation(s)
- Matteo Signorile
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, 10125, Torino, Italy
| | - Luca Braglia
- TASC Laboratory, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - Valentina Crocellà
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, 10125, Torino, Italy
| | - Piero Torelli
- TASC Laboratory, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - Elena Groppo
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, 10125, Torino, Italy
| | - Gabriele Ricchiardi
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, 10125, Torino, Italy
| | - Silvia Bordiga
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, 10125, Torino, Italy.,Center for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo, 1033 Blindern, 0315, Oslo, Norway
| | - Francesca Bonino
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, 10125, Torino, Italy
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27
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Zhang L, Yang T, He X, Zhang W, Vinai G, Tang CS, Yin X, Torelli P, Feng YP, Wong PKJ, Wee ATS. Molecular Beam Epitaxy of Two-Dimensional Vanadium-Molybdenum Diselenide Alloys. ACS Nano 2020; 14:11140-11149. [PMID: 32794699 DOI: 10.1021/acsnano.0c02124] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Two-dimensional (2D) alloys represent a versatile platform that extends the properties of atomically thin transition-metal dichalcogenides. Here, using molecular beam epitaxy, we investigate the growth of 2D vanadium-molybdenum diselenide alloys, VxMo1-xSe2, on highly oriented pyrolytic graphite and unveil their structural, chemical, and electronic integrities via measurements by scanning tunneling microscopy/spectroscopy, synchrotron X-ray photoemission, and X-ray absorption spectroscopy (XAS). Essentially, we found a critical value of x = ∼0.44, below which phase separation occurs and above which a homogeneous metallic phase is favored. Another observation is an effective increase in the density of mirror twin boundaries of constituting MoSe2 in the low V concentration regime (x ≤ 0.05). Density functional theory calculations support our experimental results on the thermal stability of 2D VxMo1-xSe2 alloys and suggest an H phase of the homogeneous alloys with alternating parallel V and Mo strips randomly in-plane stacked. Element-specific XAS of the 2D alloys, which clearly indicates quenched atomic multiplets similar to the case of 2H-VSe2, provides strong evidence for the H phase of the 2D alloys. This work provides a comprehensive understanding of the thermal stability, chemical state, and electronic structure of 2D VxMo1-xSe2 alloys, useful for the future design of 2D electronic devices.
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Affiliation(s)
- Lei Zhang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
| | - Tong Yang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| | - Xiaoyue He
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- Songshan Lake Materials Laboratory, Dongguan 523808, China
| | - Wen Zhang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, P.R. China
| | - Giovanni Vinai
- Instituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. km 163.5, Trieste I-34149, Italy
| | - Chi Sin Tang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456, Singapore
| | - Xinmao Yin
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, Singapore 117603, Singapore
| | - Piero Torelli
- Instituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. km 163.5, Trieste I-34149, Italy
| | - Yuan Ping Feng
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| | - Ping Kwan Johnny Wong
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
- School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, P.R. China
| | - Andrew T S Wee
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
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28
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Vinai G, Motti F, Petrov AY, Polewczyk V, Bonanni V, Edla R, Gobaut B, Fujii J, Suran F, Benedetti D, Salvador F, Fondacaro A, Rossi G, Panaccione G, Davidson BA, Torelli P. An integrated ultra-high vacuum apparatus for growth and in situ characterization of complex materials. Rev Sci Instrum 2020; 91:085109. [PMID: 32872955 DOI: 10.1063/5.0005302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 07/29/2020] [Indexed: 06/11/2023]
Abstract
Here, we present an integrated ultra-high vacuum apparatus-named MBE-Cluster -dedicated to the growth and in situ structural, spectroscopic, and magnetic characterization of complex materials. Molecular Beam Epitaxy (MBE) growth of metal oxides, e.g., manganites, and deposition of the patterned metallic layers can be fabricated and in situ characterized by reflection high-energy electron diffraction, low-energy electron diffraction, Auger electron spectroscopy, x-ray photoemission spectroscopy, and azimuthal longitudinal magneto-optic Kerr effect. The temperature can be controlled in the range from 5 K to 580 K, with the possibility of application of magnetic fields H up to ±7 kOe and electric fields E for voltages up to ±500 V. The MBE-Cluster operates for in-house research as well as user facility in combination with the APE beamlines at Sincrotrone-Trieste and the high harmonic generator facility for time-resolved spectroscopy.
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Affiliation(s)
- G Vinai
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - F Motti
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - A Yu Petrov
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - V Polewczyk
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - V Bonanni
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - R Edla
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - B Gobaut
- Elettra-Sincrotrone Trieste S.C.p.A, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - J Fujii
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - F Suran
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - D Benedetti
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - F Salvador
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - A Fondacaro
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - G Rossi
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - G Panaccione
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - B A Davidson
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
| | - P Torelli
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste I-34149, Italy
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29
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Braglia L, Fracchia M, Ghigna P, Minguzzi A, Meroni D, Edla R, Vandichel M, Ahlberg E, Cerrato G, Torelli P. Understanding Solid-Gas Reaction Mechanisms by Operando Soft X-Ray Absorption Spectroscopy at Ambient Pressure. J Phys Chem C Nanomater Interfaces 2020; 124:14202-14212. [PMID: 33815647 PMCID: PMC8008446 DOI: 10.1021/acs.jpcc.0c02546] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/07/2020] [Indexed: 06/12/2023]
Abstract
Ambient-pressure operando soft X-ray absorption spectroscopy (soft-XAS) was applied to study the reactivity of hydroxylated SnO2 nanoparticles toward reducing gases. H2 was first used as a test case, showing that the gas phase and surface states can be simultaneously probed: Soft-XAS at the O K-edge gains sensitivity toward the gas phase, while at the Sn M4,5-edges, tin surface states are explicitly probed. Results obtained by flowing hydrocarbons (CH4 and CH3CHCH2) unequivocally show that these gases react with surface hydroxyl groups to produce water without producing carbon oxides and release electrons that localize on Sn to eventually form SnO. The partially reduced SnO2 - x layer at the surface of SnO2 is readily reoxidized to SnO2 by treating the sample with O2 at mild temperatures (>200 °C), revealing the nature of "electron sponge" of tin oxide. The experiments, combined with DFT calculations, allowed devising of a mechanism for dissociative hydrocarbon adsorption on SnO2, involving direct reduction of Sn sites at the surface via cleavage of C-H bonds and the formation of methoxy- and/or methyl-tin species at the surface.
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Affiliation(s)
- Luca Braglia
- CNR-
Istituto Officina dei Materiali, TASC, 34149 Trieste, Italia
| | - Martina Fracchia
- Dipartimento
di Chimica, Università di Pavia, V.le Taramelli 13, I-27100 Pavia, Italy
| | - Paolo Ghigna
- Dipartimento
di Chimica, Università di Pavia, V.le Taramelli 13, I-27100 Pavia, Italy
- INSTM,
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Via Giusti 9, 50121 Firenze, Italy
| | - Alessandro Minguzzi
- Dipartimento
di Chimica, Università degli Studi
di Milano, Via Golgi 19, 20133 Milan, Italy
- INSTM,
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Via Giusti 9, 50121 Firenze, Italy
| | - Daniela Meroni
- Dipartimento
di Chimica, Università degli Studi
di Milano, Via Golgi 19, 20133 Milan, Italy
- INSTM,
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Via Giusti 9, 50121 Firenze, Italy
| | - Raju Edla
- CNR-
Istituto Officina dei Materiali, TASC, 34149 Trieste, Italia
| | - Matthias Vandichel
- Department
of Chemical Sciences and Bernal Institute, Limerick University, V94
T9PX Limerick, Ireland
| | - Elisabet Ahlberg
- Department
of Chemistry and Molecular Biology, University
of Gothenburg, Kemigården 4, SE-412 96 Gothenburg, Sweden
| | - Giuseppina Cerrato
- INSTM,
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Via Giusti 9, 50121 Firenze, Italy
- Department
of Chemistry and NIST Interdipartimental Center, Università degli Studi di Torino, via P. Giuria, 7, 10125 Torino Italy
| | - Piero Torelli
- CNR-
Istituto Officina dei Materiali, TASC, 34149 Trieste, Italia
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30
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Fracchia M, Ghigna P, Pozzi T, Anselmi Tamburini U, Colombo V, Braglia L, Torelli P. Stabilization by Configurational Entropy of the Cu(II) Active Site during CO Oxidation on Mg 0.2Co 0.2Ni 0.2Cu 0.2Zn 0.2O. J Phys Chem Lett 2020; 11:3589-3593. [PMID: 32309955 PMCID: PMC8007101 DOI: 10.1021/acs.jpclett.0c00602] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 04/20/2020] [Indexed: 05/28/2023]
Abstract
The mechanisms of CO oxidation on the Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O high-entropy oxide were studied by means of operando soft X-ray absorption spectroscopy. We found that Cu is the active metal and that Cu(II) can be rapidly reduced to Cu(I) by CO when the temperature is higher than 130 °C. Co and Ni do not have any role in this respect. The Cu(II) oxidation state can be easily but slowly recovered by treatment of the sample with O2 at ca. 250 °C. However, it should be noted that CuO is readily and irreversibly reduced to Cu(I) when it is treated with CO at T > 100 °C. Thus, the main conclusion of this work is that the high configurational entropy of Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O stabilizes the rock-salt structure and permits the oxidation/reduction of Cu to be reversible, thus permitting the catalytic cycle to take place.
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Affiliation(s)
- Martina Fracchia
- Dipartimento
di Chimica, Università di Pavia, V. le Taramelli 13, I-27100, Pavia, Italy
| | - Paolo Ghigna
- Dipartimento
di Chimica, Università di Pavia, V. le Taramelli 13, I-27100, Pavia, Italy
- INSTM,
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Via Giusti 9, I-50121 Firenze, Italy
| | - Tommaso Pozzi
- Dipartimento
di Chimica, Università di Pavia, V. le Taramelli 13, I-27100, Pavia, Italy
| | - Umberto Anselmi Tamburini
- Dipartimento
di Chimica, Università di Pavia, V. le Taramelli 13, I-27100, Pavia, Italy
- INSTM,
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Via Giusti 9, I-50121 Firenze, Italy
| | - Valentina Colombo
- INSTM,
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Via Giusti 9, I-50121 Firenze, Italy
- Dipartimento
di Chimica, Università degli Studi
di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Luca Braglia
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
| | - Piero Torelli
- CNR
- Istituto Officina dei Materiali, TASC, I-34149 Trieste, Italy
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31
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Zhang W, Zhang L, Wong PKJ, Yuan J, Vinai G, Torelli P, van der Laan G, Feng YP, Wee ATS. Magnetic Transition in Monolayer VSe 2 via Interface Hybridization. ACS Nano 2019; 13:8997-9004. [PMID: 31306576 DOI: 10.1021/acsnano.9b02996] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Magnetism in monolayer (ML) VSe2 has attracted broad interest in spintronics, while existing reports have not reached consensus. Using element-specific X-ray magnetic circular dichroism, a magnetic transition in ML VSe2 has been demonstrated at the contamination-free interface between Co and VSe2. Through interfacial hybridization with a Co atomic overlayer, a magnetic moment of about 0.4 μB per V atom in ML VSe2 is revealed, approaching values predicted by previous theoretical calculations. Promotion of the ferromagnetism in ML VSe2 is accompanied by its antiferromagnetic coupling to Co and a reduction in the spin moment of Co. In comparison to the absence of this interface-induced ferromagnetism at the Fe/ML MoSe2 interface, these findings at the Co/ML VSe2 interface provide clear proof that the ML VSe2, initially with magnetic disorder, is on the verge of magnetic transition.
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Affiliation(s)
- Wen Zhang
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542
| | - Lei Zhang
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542
| | - Ping Kwan Johnny Wong
- Centre for Advanced 2D Materials and Graphene Research Centre , National University of Singapore , 6 Science Drive 2 , Singapore 117546
| | - Jiaren Yuan
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542
| | - Giovanni Vinai
- Laboratorio TASC , IOM-CNR , S.S. 14 km 163.5, Basovizza , 34149 Trieste , Italy
| | - Piero Torelli
- Laboratorio TASC , IOM-CNR , S.S. 14 km 163.5, Basovizza , 34149 Trieste , Italy
| | - Gerrit van der Laan
- Magnetic Spectroscopy Group , Diamond Light Source , Didcot OX11 0DE , United Kingdom
| | - Yuan Ping Feng
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542
| | - Andrew T S Wee
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542
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32
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Wong PKJ, Zhang W, Bussolotti F, Yin X, Herng TS, Zhang L, Huang YL, Vinai G, Krishnamurthi S, Bukhvalov DW, Zheng YJ, Chua R, N'Diaye AT, Morton SA, Yang CY, Ou Yang KH, Torelli P, Chen W, Goh KEJ, Ding J, Lin MT, Brocks G, de Jong MP, Castro Neto AH, Wee ATS. Evidence of Spin Frustration in a Vanadium Diselenide Monolayer Magnet. Adv Mater 2019; 31:e1901185. [PMID: 30997712 DOI: 10.1002/adma.201901185] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 03/30/2019] [Indexed: 06/09/2023]
Abstract
Monolayer VSe2 , featuring both charge density wave and magnetism phenomena, represents a unique van der Waals magnet in the family of metallic 2D transition-metal dichalcogenides (2D-TMDs). Herein, by means of in situ microscopy and spectroscopic techniques, including scanning tunneling microscopy/spectroscopy, synchrotron X-ray and angle-resolved photoemission, and X-ray absorption, direct spectroscopic signatures are established, that identify the metallic 1T-phase and vanadium 3d1 electronic configuration in monolayer VSe2 grown on graphite by molecular-beam epitaxy. Element-specific X-ray magnetic circular dichroism, complemented with magnetic susceptibility measurements, further reveals monolayer VSe2 as a frustrated magnet, with its spins exhibiting subtle correlations, albeit in the absence of a long-range magnetic order down to 2 K and up to a 7 T magnetic field. This observation is attributed to the relative stability of the ferromagnetic and antiferromagnetic ground states, arising from its atomic-scale structural features, such as rotational disorders and edges. The results of this study extend the current understanding of metallic 2D-TMDs in the search for exotic low-dimensional quantum phenomena, and stimulate further theoretical and experimental studies on van der Waals monolayer magnets.
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Affiliation(s)
- Ping Kwan Johnny Wong
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
| | - Wen Zhang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Fabio Bussolotti
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*Star), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Xinmao Yin
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Tun Seng Herng
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore
| | - Lei Zhang
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Yu Li Huang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Giovanni Vinai
- Instituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. Km 163.5, Trieste, I-34149, Italy
| | - Sridevi Krishnamurthi
- Computational Materials Science, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500, AE, Enschede, The Netherlands
| | - Danil W Bukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing, 210037, P. R. China
- Institute of Physics and Technology, Ural Federal University, Mira Street 19, 620002, Yekaterinburg, Russia
| | - Yu Jie Zheng
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Rebekah Chua
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Alpha T N'Diaye
- Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Simon A Morton
- Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Chao-Yao Yang
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Kui-Hon Ou Yang
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Piero Torelli
- Instituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S. Km 163.5, Trieste, I-34149, Italy
| | - Wei Chen
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
- Department of Chemistry, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Kuan Eng Johnson Goh
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*Star), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Jun Ding
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore
| | - Minn-Tsong Lin
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Geert Brocks
- Computational Materials Science, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500, AE, Enschede, The Netherlands
| | - Michel P de Jong
- NanoElectronics Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500, AE, Enschede, The Netherlands
| | - Antonio H Castro Neto
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
| | - Andrew Thye Shen Wee
- Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC), National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore
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Brambilla A, Picone A, Giannotti D, Calloni A, Berti G, Bussetti G, Achilli S, Fratesi G, Trioni MI, Vinai G, Torelli P, Panaccione G, Duò L, Finazzi M, Ciccacci F. Correction to "Enhanced Magnetic Hybridization of a Spinterface through Insertion of a Two-Dimensional Magnetic Oxide Layer". Nano Lett 2019; 19:2186. [PMID: 30758211 DOI: 10.1021/acs.nanolett.9b00190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
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Castán-Guerrero C, Krizmancic D, Bonanni V, Edla R, Deluisa A, Salvador F, Rossi G, Panaccione G, Torelli P. A reaction cell for ambient pressure soft x-ray absorption spectroscopy. Rev Sci Instrum 2018; 89:054101. [PMID: 29864817 DOI: 10.1063/1.5019333] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We present a new experimental setup for performing X-ray Absorption Spectroscopy (XAS) in the soft X-ray range at ambient pressure. The ambient pressure XAS setup is fully compatible with the ultra high vacuum environment of a synchrotron radiation spectroscopy beamline end station by means of ultrathin Si3N4 membranes acting as windows for the X-ray beam and seal of the atmospheric sample environment. The XAS detection is performed in total electron yield (TEY) mode by probing the drain current from the sample with a picoammeter. The high signal/noise ratio achievable in the TEY mode, combined with a continuous scanning of the X-ray energies, makes it possible recording XAS spectra in a few seconds. The first results show the performance of this setup to record fast XAS spectra from sample surfaces exposed at atmospheric pressure, even in the case of highly insulating samples. The use of a permanent magnet inside the reaction cell enables the measurement of X-ray magnetic circular dichroism at ambient pressure.
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Affiliation(s)
- C Castán-Guerrero
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - D Krizmancic
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - V Bonanni
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - R Edla
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - A Deluisa
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - F Salvador
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - G Rossi
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - G Panaccione
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
| | - P Torelli
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza 34149, Trieste, Italy
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35
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Borgatti F, Torelli P, Brucale M, Gentili D, Panaccione G, Castan Guerrero C, Schäfer B, Ruben M, Cavallini M. Opposite Surface and Bulk Solvatochromic Effects in a Molecular Spin-Crossover Compound Revealed by Ambient Pressure X-ray Absorption Spectroscopy. Langmuir 2018; 34:3604-3609. [PMID: 29510051 DOI: 10.1021/acs.langmuir.8b00028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigate the solvatochromic effect of a Fe-based spin-crossover (SCO) compound via ambient pressure soft X-ray absorption spectroscopy (AP-XAS) and atomic force microscopy (AFM). AP-XAS provides the direct evidence of the spin configuration for the Fe(II) 3d states of the SCO material upon in situ exposure to specific gas or vapor mixtures; concurrent changes in nanoscale topography and mechanical characteristics are revealed via AFM imaging and AFM-based force spectroscopy, respectively. We find that exposing the SCO material to gaseous helium promotes an effective decrease of the transition temperature of its surface layers, while the exposure to methanol vapor causes opposite surfacial and bulk solvatochromic effects. Surfacial solvatochromism is accompanied by a dramatic reduction of the surface layers stiffness. We propose a rationalization of the observed effects based on interfacial dehydration and solvation phenomena.
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Affiliation(s)
- Francesco Borgatti
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Piero Torelli
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Marco Brucale
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Denis Gentili
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Giancarlo Panaccione
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Celia Castan Guerrero
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Bernhard Schäfer
- Institute of Nanotechnology , Karlsruhe Institute of Technology , Eggenstein-Leopoldshafen D-76344 , Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) , CNRS-Université de Strasbourg , 23, rue du Loess, BP 43 , Strasbourg Cedex 2 67034 , France
| | - Mario Ruben
- Institute of Nanotechnology , Karlsruhe Institute of Technology , Eggenstein-Leopoldshafen D-76344 , Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) , CNRS-Université de Strasbourg , 23, rue du Loess, BP 43 , Strasbourg Cedex 2 67034 , France
| | - Massimiliano Cavallini
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
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36
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Vinai G, Ressel B, Torelli P, Loi F, Gobaut B, Ciancio R, Casarin B, Caretta A, Capasso L, Parmigiani F, Cugini F, Solzi M, Malvestuto M, Ciprian R. Giant magneto-electric coupling in 100 nm thick Co capped by ZnO nanorods. Nanoscale 2018; 10:1326-1336. [PMID: 29296985 DOI: 10.1039/c7nr09233d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Here we report a giant, completely reversible magneto-electric coupling of 100 nm polycrystalline Co layer in contact with ZnO nanorods. When the sample is under an applied bias of ±2 V, the Co magnetic coercivity is reduced by a factor 5 from the un-poled case, with additionally a reduction of total magnetic moment in Co. Taking into account the chemical properties of ZnO nanorods measured by X-rays absorption near edge spectroscopy under bias, we conclude that these macroscopic effects on the magnetic response of the Co layer are due to the microstructure and the strong strain-driven magneto-electric coupling induced by the ZnO nanorods, whose nanostructuration maximizes the piezoelectric response under bias.
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Affiliation(s)
- Giovanni Vinai
- CNR-Istituto Officina dei Materiali IOM, s.s. 14 km 163.5, 34149, Trieste, Italy
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37
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Brambilla A, Picone A, Giannotti D, Calloni A, Berti G, Bussetti G, Achilli S, Fratesi G, Trioni MI, Vinai G, Torelli P, Panaccione G, Duò L, Finazzi M, Ciccacci F. Enhanced Magnetic Hybridization of a Spinterface through Insertion of a Two-Dimensional Magnetic Oxide Layer. Nano Lett 2017; 17:7440-7446. [PMID: 29149565 DOI: 10.1021/acs.nanolett.7b03314] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Interfaces between organic semiconductors and ferromagnetic metals offer intriguing opportunities in the rapidly developing field of organic spintronics. Understanding and controlling the spin-polarized electronic states at the interface is the key toward a reliable exploitation of this kind of systems. Here we propose an approach consisting in the insertion of a two-dimensional magnetic oxide layer at the interface with the aim of both increasing the reproducibility of the interface preparation and offering a way for a further fine control over the electronic and magnetic properties. We have inserted a two-dimensional Cr4O5 layer at the C60/Fe(001) interface and have characterized the corresponding morphological, electronic, and magnetic properties. Scanning tunneling microscopy and electron diffraction show that the film grows well-ordered both in the monolayer and multilayer regimes. Electron spectroscopies confirm that hybridization of the electronic states occurs at the interface. Finally, magnetic dichroism in X-ray absorption shows an unprecedented spin-polarization of the hybridized fullerene states. The latter result is discussed also in light of an ab initio theoretical analysis.
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Affiliation(s)
- Alberto Brambilla
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Andrea Picone
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Dario Giannotti
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Alberto Calloni
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Giulia Berti
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Gianlorenzo Bussetti
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Simona Achilli
- Dipartimento di Fisica, Università degli Studi di Milano , Via Celoria, 16, 20133 Milano, Italy
| | - Guido Fratesi
- Dipartimento di Fisica, Università degli Studi di Milano , Via Celoria, 16, 20133 Milano, Italy
| | - Mario I Trioni
- CNR - National Research Council of Italy, ISTM , via Golgi 19, 20133 Milano, Italy
| | - Giovanni Vinai
- Laboratorio TASC, IOM-CNR , S.S. 14 km 163.5, Basovizza, I, 34149 Trieste, Italy
| | - Piero Torelli
- Laboratorio TASC, IOM-CNR , S.S. 14 km 163.5, Basovizza, I, 34149 Trieste, Italy
| | - Giancarlo Panaccione
- Laboratorio TASC, IOM-CNR , S.S. 14 km 163.5, Basovizza, I, 34149 Trieste, Italy
| | - Lamberto Duò
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Marco Finazzi
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
| | - Franco Ciccacci
- Dipartimento di Fisica, Politecnico di Milano , piazza Leonardo da Vinci, 32, 20133 Milano, Italy
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Gobaut B, Orgiani P, Sambri A, di Gennaro E, Aruta C, Borgatti F, Lollobrigida V, Céolin D, Rueff JP, Ciancio R, Bigi C, Das PK, Fujii J, Krizmancic D, Torelli P, Vobornik I, Rossi G, Miletto Granozio F, Scotti di Uccio U, Panaccione G. Role of Oxygen Deposition Pressure in the Formation of Ti Defect States in TiO 2(001) Anatase Thin Films. ACS Appl Mater Interfaces 2017; 9:23099-23106. [PMID: 28613812 DOI: 10.1021/acsami.7b03181] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the study of anatase TiO2(001)-oriented thin films grown by pulsed laser deposition on LaAlO3(001). A combination of in situ and ex situ methods has been used to address both the origin of the Ti3+-localized states and their relationship with the structural and electronic properties on the surface and the subsurface. Localized in-gap states are analyzed using resonant X-ray photoelectron spectroscopy and are related to the Ti3+ electronic configuration, homogeneously distributed over the entire film thickness. We find that an increase in the oxygen pressure corresponds to an increase in Ti3+ only in a well-defined range of deposition pressure; outside this range, Ti3+ and the strength of the in-gap states are reduced.
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Affiliation(s)
- Benoit Gobaut
- Elettra Sincrotrone Trieste S.c.p.A. , Basovizza, I-34012 Trieste, Italy
| | | | - Alessia Sambri
- CNR-SPIN, UOS Napoli , I-80126 Napoli, Italy
- Department of Physics, University of Napoli Federico II , I-80126 Napoli, Italy
| | - Emiliano di Gennaro
- CNR-SPIN, UOS Napoli , I-80126 Napoli, Italy
- Department of Physics, University of Napoli Federico II , I-80126 Napoli, Italy
| | - Carmela Aruta
- CNR-SPIN, UOS Napoli , I-80126 Napoli, Italy
- Department of Physics, University of Napoli Federico II , I-80126 Napoli, Italy
| | | | | | - Denis Céolin
- Synchrotron SOLEIL , L'Orme des Merisiers, BP 48, Saint Aubin, 91192 Gif sur Yvette, France
| | - Jean-Pascal Rueff
- Synchrotron SOLEIL , L'Orme des Merisiers, BP 48, Saint Aubin, 91192 Gif sur Yvette, France
- Laboratoire de Chimie Physique-Matière et Rayonnement, UPMC Université; Paris 06, CNRS, UMR 7614 , F-75005 Paris, France
| | | | - Chiara Bigi
- CNR-IOM, Laboratorio TASC , I-34149 Trieste, Italy
- Department of Physics, University of Milano , I-20133 Milano, Italy
| | - Pranab Kumar Das
- CNR-IOM, Laboratorio TASC , I-34149 Trieste, Italy
- International Centre for Theoretical Physics (ICTP) , I-34100 Trieste, Italy
| | - Jun Fujii
- CNR-IOM, Laboratorio TASC , I-34149 Trieste, Italy
| | | | | | | | - Giorgio Rossi
- CNR-IOM, Laboratorio TASC , I-34149 Trieste, Italy
- Department of Physics, University of Milano , I-20133 Milano, Italy
| | - Fabio Miletto Granozio
- CNR-SPIN, UOS Napoli , I-80126 Napoli, Italy
- Department of Physics, University of Napoli Federico II , I-80126 Napoli, Italy
| | - Umberto Scotti di Uccio
- CNR-SPIN, UOS Napoli , I-80126 Napoli, Italy
- Department of Physics, University of Napoli Federico II , I-80126 Napoli, Italy
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39
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Lazzarini A, Pellegrini R, Piovano A, Rudić S, Castan-Guerrero C, Torelli P, Chierotti MR, Gobetto R, Lamberti C, Groppo E. The effect of surface chemistry on the performances of Pd-based catalysts supported on activated carbons. Catal Sci Technol 2017. [DOI: 10.1039/c7cy01005b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work we investigated in detail the effects of nitric acid on the surface chemistry of two carbons, activated by steam and by phosphoric acid, meant to identify the nature and the concentration of the oxidized surface species.
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Affiliation(s)
- A. Lazzarini
- Department of Chemistry
- NIS Centre and INSTM
- University of Turin
- Turin
- Italy
| | - R. Pellegrini
- Chimet SpA – Catalyst Division
- Viciomaggio Arezzo
- Italy
| | - A. Piovano
- Institut Laue-Langevin (ILL)
- 38000 Grenoble
- France
| | - S. Rudić
- ISIS Facility
- Rutherford Appleton Laboratory
- Didcot
- UK
| | - C. Castan-Guerrero
- CNR-Istituto Officina dei Materiali
- Laboratorio TASC in Area Science Park
- 34149 Trieste
- Italy
| | - P. Torelli
- CNR-Istituto Officina dei Materiali
- Laboratorio TASC in Area Science Park
- 34149 Trieste
- Italy
| | - M. R. Chierotti
- Department of Chemistry
- NIS Centre and INSTM
- University of Turin
- Turin
- Italy
| | - R. Gobetto
- Department of Chemistry
- NIS Centre and INSTM
- University of Turin
- Turin
- Italy
| | - C. Lamberti
- Department of Chemistry
- NIS Centre and INSTM
- University of Turin
- Turin
- Italy
| | - E. Groppo
- Department of Chemistry
- NIS Centre and INSTM
- University of Turin
- Turin
- Italy
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40
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Benedetti S, Valenti I, di Bona A, Vinai G, Castan-Guerrero C, Valeri S, Catellani A, Ruini A, Torelli P, Calzolari A. Spectroscopic identification of the chemical interplay between defects and dopants in Al-doped ZnO. Phys Chem Chem Phys 2017; 19:29364-29371. [DOI: 10.1039/c7cp05864k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Contributions to the spectroscopic response of defects and dopants in Al-doped ZnO films are determined combining X-ray spectroscopies and DFT.
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41
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Pincelli T, Grasselli F, Petrov VN, Torelli P, Rossi G. Performance of photoelectron spin polarimeters with continuous and pulsed sources: from storage rings to free electron lasers. J Synchrotron Radiat 2017; 24:175-187. [PMID: 28009557 DOI: 10.1107/s1600577516017513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Accepted: 11/01/2016] [Indexed: 06/06/2023]
Abstract
In this work the experimental uncertainties concerning electron spin polarization (SP) under various realistic measurement conditions are theoretically derived. The accuracy of the evaluation of the SP of the photoelectron current is analysed as a function of the detector parameters and specifications, as well as of the characteristics of the photoexcitation sources. In particular, the different behaviour of single counter or twin counter detectors when the intensity fluctuations of the source are considered have been addressed, leading to a new definition of the SP detector performance. The widely used parameter called the figure of merit is shown to be inadequate for describing the efficiency of SP polarimeters, especially when they are operated with time-structured excitation sources such as free-electron lasers. Numerical simulations have been performed and yield strong implications in the choice of the detecting instruments in spin-polarization experiments, that are constrained in a limited measurement time. Our results are therefore applied to the characteristics of a wide set of state-of-the-art spectroscopy facilities all over the world, and an efficiency diagram for SP experiments is derived. These results also define new mathematical instruments for handling the correct statistics of SP measurements in the presence of source intensity fluctuations.
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Affiliation(s)
- T Pincelli
- Dipartimento di Fisica, Università degli studi di Milano, Via Celoria 16, 20133 Milano, Italy
| | - F Grasselli
- Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/a, Modena, Italy
| | - V N Petrov
- Saint Petersburg State Polytechnical University, Politechnicheskaya Street 29, 195251, Russian Federation
| | - P Torelli
- Laboratorio TASC, IOM-CNR, SS 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - G Rossi
- Dipartimento di Fisica, Università degli studi di Milano, Via Celoria 16, 20133 Milano, Italy
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Abstract
The role of non-pharmacological therapies in the preventive treatment of tension-type headache (TTH) is still an object of debate. The primary aim of this study was therefore to investigate the therapeutic effect of physiotherapy in properly classified patients with TTH in a controlled trial. Fifty patients with TTH, 26 with episodic, frequent (ETTH) and 24 with chronic TTH (CTTH) fulfilling the International Headache Society classification criteria were included in the study. After a 4-week run-in period, they were randomized to either an 8-week period of standardized physiotherapy (group 1) or to an 8-week observation period followed by an identical course of physiotherapy (group 2); after the physiotherapy all patients were followed for a 12-week follow-up period. We then evaluated the number of days with headache, severity and duration of the headache attacks, and drug consumption for symptomatic treatment before and after the course of physiotherapy. Forty-eight patients completed the study. The average number of days with headache per 4-week period was reduced from 16.3 days at baseline to 12.3 days in the last 4 weeks of treatment [from 14.5 days to 10.5 days ( P < 0.001) in group 1 and from 18.1 days to 14.1 days ( P < 0.001) in group 2]. Severity and duration of headache as well as drug consumption were unchanged throughout the study. Analysing the response to treatment separately in the various subgroups, we found that the number of responders was significantly higher among patients with CTTH vs. patients with ETTH ( P < 0.002) and in females vs. males ( P < 0.02). No differences were found between patients with and without disorder of pericranial muscles. We conclude that a standardized physiotherapy programme has a good therapeutic effect, albeit on a restricted group of patients.
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Affiliation(s)
- P Torelli
- Headache Centre, Unit of Neurology, Department of Neuroscience, University of Parma, Strada del Quartiere 4, 43100 Parma, Italy.
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43
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Pincelli T, Petrov VN, Brajnik G, Ciprian R, Lollobrigida V, Torelli P, Krizmancic D, Salvador F, De Luisa A, Sergo R, Gubertini A, Cautero G, Carrato S, Rossi G, Panaccione G. Design and optimization of a modular setup for measurements of three-dimensional spin polarization with ultrafast pulsed sources. Rev Sci Instrum 2016; 87:035111. [PMID: 27036823 DOI: 10.1063/1.4943255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
ULTRASPIN is an apparatus devoted to the measurement of the spin polarization (SP) of electrons ejected from solid surfaces in a UHV environment. It is designed to exploit ultrafast light sources (free electron laser or laser high harmonic generation) and to perform (photo)electron spin analysis by an arrangement of Mott scattering polarimeters that measure the full SP vector. The system consists of two interconnected UHV vessels: one for surface science sample cleaning treatments, e-beam deposition of ultrathin films, and low energy electron diffraction/AES characterization. The sample environment in the polarimeter allows for cryogenic cooling and in-operando application of electric and magnetic fields. The photoelectrons are collected by an electrostatic accelerator and transport lens that form a periaxial beam that is subsequently directed by a Y-shaped electrostatic deflector to either one of the two orthogonal Mott polarimeters. The apparatus has been designed to operate in the extreme conditions of ultraintense single-X-ray pulses as originated by free electron lasers (up to 1 kHz), but it allows also for the single electron counting mode suitable when using statistical sources such as synchrotron radiation, cw-laser, or e-gun beams (up to 150 kcps).
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Affiliation(s)
- T Pincelli
- Dipartimento di Fisica, Università degli studi di Milano, Via Celoria 16, 20133 Milano, Italy
| | - V N Petrov
- Saint Petersburg State Polytechnical University, Politechnicheskaya Street 29, 195251 Saint Petersburg, Russia
| | - G Brajnik
- Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy
| | - R Ciprian
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - V Lollobrigida
- Dipartimento di Matematica e Fisica, Università Roma Tre, I-00146 Rome, Italy
| | - P Torelli
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - D Krizmancic
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - F Salvador
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - A De Luisa
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - R Sergo
- Sincrotrone Trieste S.C.p.A, Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - A Gubertini
- Sincrotrone Trieste S.C.p.A, Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - G Cautero
- Sincrotrone Trieste S.C.p.A, Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - S Carrato
- Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy
| | - G Rossi
- Dipartimento di Fisica, Università degli studi di Milano, Via Celoria 16, 20133 Milano, Italy
| | - G Panaccione
- Laboratorio TASC, IOM-CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste, Italy
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Abstract
The International Classification of Headache Disorders, 3rd edition (beta version) has significantly improved the categorization of chronic headaches. From a clinical standpoint, however, it still has a few limitations, both general and specific. Among the former is the fact that international headache classifications are aimed less at defining the disease than at characterizing the features of attacks, meaning that their structure is ill suited to dealing with chronic headaches where the patient must be the focus of the discussion. Among the latter is the fact that the diagnostic criteria for chronic migraine do not distinguish between cases differing widely in severity and that the issue of whether medication overuse headache can be considered an autonomous entity is still unsolved. We propose that changes be made in the systematizations of chronic migraine and medication overuse headache to make them more consistent with clinical practice.
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Affiliation(s)
- G C Manzoni
- Department of Clinical and Experimental Medicine, Headache Centre, University of Parma, Parma, Italy,
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45
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Vasconcelos HMDN, Eddrief M, Zheng Y, Demaille D, Hidki S, Fonda E, Novikova A, Fujii J, Torelli P, Salles BR, Vobornik I, Panaccione G, de Oliveira AJA, Marangolo M, Vidal F. Magnetically Hard Fe3Se4 Embedded in Bi2Se3 Topological Insulator Thin Films Grown by Molecular Beam Epitaxy. ACS Nano 2016; 10:1132-1138. [PMID: 26653134 DOI: 10.1021/acsnano.5b06430] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We investigated the structural, magnetic, and electronic properties of Bi2Se3 epilayers containing Fe grown on GaAs(111) by molecular beam epitaxy. It is shown that, in the window of growth parameters leading to Bi2Se3 epilayers with optimized quality, Fe atom clustering leads to the formation of FexSey inclusions. These objects have platelet shape and are embedded within Bi2Se3. Monoclinic Fe3Se4 is identified as the main secondary phase through detailed structural measurements. Due to the presence of the hard ferrimagnetic Fe3Se4 inclusions, the system exhibits a very large coercive field at low temperature and room temperature magnetic ordering. Despite this composite structure and the proximity of a magnetic phase, the surface electronic structure of Bi2Se3 is preserved, as shown by the persistence of a gapless Dirac cone at Γ.
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Affiliation(s)
- Hugo Menezes do Nascimento Vasconcelos
- Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
- Departamento de Física, Universidade Federal de São Carlos , CP 676, 13565-905 São Carlos, SP, Brazil
| | - Mahmoud Eddrief
- Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Yunlin Zheng
- Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Dominique Demaille
- Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Sarah Hidki
- Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Emiliano Fonda
- Synchrotron Soleil , L'Orme des Merisiers Saint-Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Anastasiia Novikova
- Synchrotron Soleil , L'Orme des Merisiers Saint-Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Jun Fujii
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
| | - Piero Torelli
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
| | - Benjamin Rache Salles
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
- Instituto de Física, Universidade Federal do Rio de Janeiro , 21941-972 Rio de Janeiro, RJ, Brazil
| | - Ivana Vobornik
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
| | - Giancarlo Panaccione
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy
| | | | - Massimiliano Marangolo
- Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
| | - Franck Vidal
- Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
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Gentili D, Liscio F, Demitri N, Schäfer B, Borgatti F, Torelli P, Gobaut B, Panaccione G, Rossi G, Degli Esposti A, Gazzano M, Milita S, Bergenti I, Ruani G, Šalitroš I, Ruben M, Cavallini M. Surface induces different crystal structures in a room temperature switchable spin crossover compound. Dalton Trans 2016; 45:134-43. [PMID: 26575005 DOI: 10.1039/c5dt03712c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We investigated the influence of surfaces in the formation of different crystal structures of a spin crossover compound, namely [Fe(L)2] (LH: (2-(pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine), which is a neutral compound thermally switchable around room temperature. We observed that the surface induces the formation of two different crystal structures, which exhibit opposite spin transitions, i.e. on heating them up to the transition temperature, one polymorph switches from high spin to low spin and the second polymorph switches irreversibly from low spin to high spin. We attributed this inversion to the presence of water molecules H-bonded to the complex tetrazolyl moieties in the crystals. Thin deposits were investigated by means of polarized optical microscopy, atomic force microscopy, X-ray diffraction, X-ray absorption spectroscopy and micro Raman spectroscopy; moreover the analysis of the Raman spectra and the interpretation of spin inversion were supported by DFT calculations.
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Affiliation(s)
- Denis Gentili
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Fabiola Liscio
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Nicola Demitri
- Elettra - Sincrotrone Trieste, S.S. 14 Km 163.5 in Area Science Park, 34149 Basovizza - Trieste, Italy
| | - Bernhard Schäfer
- Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Denmark
| | - Francesco Borgatti
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Piero Torelli
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, Area Science Park, I-34149 Trieste, Italy
| | - Benoit Gobaut
- Elettra - Sincrotrone Trieste, S.S. 14 Km 163.5 in Area Science Park, 34149 Basovizza - Trieste, Italy
| | - Giancarlo Panaccione
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, Area Science Park, I-34149 Trieste, Italy
| | - Giorgio Rossi
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, Area Science Park, I-34149 Trieste, Italy and Universita` di Milano, Dipartimento di Fisica, via Celoria 16, 20133 Milano, Italy
| | - Alessandra Degli Esposti
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività (CNR-ISOF) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Massimo Gazzano
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività (CNR-ISOF) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Silvia Milita
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Ilaria Bergenti
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Giampiero Ruani
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Ivan Šalitroš
- Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava, 81237, Slovakia
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Denmark and Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23, rue du Loess, BP 43, 67034, Strasbourg Cedex 2, France
| | - Massimiliano Cavallini
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
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47
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Ciprian R, Torelli P, Giglia A, Gobaut B, Ressel B, Vinai G, Stupar M, Caretta A, De Ninno G, Pincelli T, Casarin B, Adhikary G, Sberveglieri G, Baratto C, Malvestuto M. New strategy for magnetic gas sensing. RSC Adv 2016. [DOI: 10.1039/c6ra18213e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
New strategy for room temperature magnetic gas sensing based on magnetoelectrically-coupled hybrids. The sensor is sensitive, fast and cost-effective. The sensing is allowed thanks to the magneto-electric coupling at the interface.
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Affiliation(s)
- R. Ciprian
- Elettra Sincrotrone di Trieste
- Trieste
- Italy
| | - P. Torelli
- CNR-Istituto Officina dei Materiali IOM
- Trieste
- Italy
| | - A. Giglia
- CNR-Istituto Officina dei Materiali IOM
- Trieste
- Italy
| | - B. Gobaut
- Elettra Sincrotrone di Trieste
- Trieste
- Italy
| | | | - G. Vinai
- CNR-Istituto Officina dei Materiali IOM
- Trieste
- Italy
| | | | - A. Caretta
- Elettra Sincrotrone di Trieste
- Trieste
- Italy
| | - G. De Ninno
- Elettra Sincrotrone di Trieste
- Trieste
- Italy
- University of Nova Gorica
- Slovenia
| | - T. Pincelli
- CNR-Istituto Officina dei Materiali IOM
- Trieste
- Italy
- Physics Department
- University of Milano
| | - B. Casarin
- Elettra Sincrotrone di Trieste
- Trieste
- Italy
- Physics Department
- University of Trieste
| | | | - G. Sberveglieri
- CNR-INO and Department of Information Engineering
- University of Brescia
- 25133 Brescia
- Italy
| | - C. Baratto
- CNR-INO and Department of Information Engineering
- University of Brescia
- 25133 Brescia
- Italy
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48
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Rösner B, Milek M, Witt A, Gobaut B, Torelli P, Fink RH, Khusniyarov MM. Reversible Photoswitching of a Spin‐Crossover Molecular Complex in the Solid State at Room Temperature. Angew Chem Int Ed Engl 2015; 54:12976-80. [DOI: 10.1002/anie.201504192] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 08/11/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Benedikt Rösner
- Department of Chemistry and Pharmacy, Friedrich‐Alexander University of Erlangen‐Nuremberg, Egerlandstrasse 1–3, 91058 Erlangen (Germany) http://chemie.fau.de/khusniyarov
| | - Magdalena Milek
- Department of Chemistry and Pharmacy, Friedrich‐Alexander University of Erlangen‐Nuremberg, Egerlandstrasse 1–3, 91058 Erlangen (Germany) http://chemie.fau.de/khusniyarov
| | - Alexander Witt
- Department of Chemistry and Pharmacy, Friedrich‐Alexander University of Erlangen‐Nuremberg, Egerlandstrasse 1–3, 91058 Erlangen (Germany) http://chemie.fau.de/khusniyarov
| | - Benoît Gobaut
- Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, Area Science Park, 34149 Trieste (Italy)
| | - Piero Torelli
- Laboratorio TASC, IOM‐CNR, S.S. 14 km 163.5, Basovizza, 34149 Trieste (Italy)
| | - Rainer H. Fink
- Department of Chemistry and Pharmacy, Friedrich‐Alexander University of Erlangen‐Nuremberg, Egerlandstrasse 1–3, 91058 Erlangen (Germany) http://chemie.fau.de/khusniyarov
| | - Marat M. Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich‐Alexander University of Erlangen‐Nuremberg, Egerlandstrasse 1–3, 91058 Erlangen (Germany) http://chemie.fau.de/khusniyarov
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49
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Rösner B, Milek M, Witt A, Gobaut B, Torelli P, Fink RH, Khusniyarov MM. Reversible Photoswitching of a Spin-Crossover Molecular Complex in the Solid State at Room Temperature. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504192] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Perrini S, Guidi B, Torelli P, Forte A. Parvovirus B19 associated acute cholestatic hepatitis. Pediatr Med Chir 2014; 36:102. [DOI: 10.4081/pmc.2014.102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 02/09/2015] [Indexed: 11/23/2022] Open
Abstract
There are few reports in the literature of hepatitis as a manifestation of Parvovirus B19 infection. We describe a case of Parvovirus B19 associated acute cholestatic hepatitis diagnosed based on a positive serologic test (IgM) and molecular detection of parvovirus B19 DNA in peripheral blood. Parvovirus B19 infection should be considered in the differential diagnosis of patient presenting with acute hepatitis of unknown etiology.
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