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Abstract
Layered MoS2 is considered as one of the most promising two-dimensional photocatalytic materials for hydrogen evolution and water splitting; however, the electronic structure at the MoS2-liquid interface is so far insufficiently resolved. Measuring and understanding the band offset at the surfaces of MoS2 are crucial for understanding catalytic reactions and to achieve further improvements in performance. Herein, the heterogeneous charge transfer behavior of MoS2 flakes of various layer numbers and sizes is addressed with high spatial resolution in organic solutions using the ferrocene/ferrocenium (Fc/Fc+) redox pair as a probe in near-field scanning electrochemical microscopy, i.e. in close nm probe-sample proximity. Redox mapping reveals an area and layer dependent reactivity for MoS2 with a detailed insight into the local processes as band offset and confinement of the faradaic current obtained. In combination with additional characterization methods, we deduce a band alignment occurring at the liquid-solid interface. Here, high-resolution atomic force microscopy and scanning electrochemical microscopy are used to investigate the electron transfer behaviour of layered MoS2 flakes in organic solutions, offering insights on the electronic band alignment at the solid-liquid interface.
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Janakiram S, Martín Espejo JL, Yu X, Ansaloni L, Deng L. Facilitated transport membranes containing graphene oxide-based nanoplatelets for CO2 separation: Effect of 2D filler properties. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.118626] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Magnabosco G, Pantano MF, Rapino S, Di Giosia M, Valle F, Taxis L, Sparla F, Falini G, Pugno NM, Calvaresi M. A Plant Bioreactor for the Synthesis of Carbon Nanotube Bionic Nanocomposites. Front Bioeng Biotechnol 2020; 8:560349. [PMID: 33251194 PMCID: PMC7676904 DOI: 10.3389/fbioe.2020.560349] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 10/14/2020] [Indexed: 12/15/2022] Open
Abstract
Bionic composites are an emerging class of materials produced exploiting living organisms as reactors to include synthetic functional materials in their native and highly performing structures. In this work, single wall carboxylated carbon nanotubes (SWCNT-COOH) were incorporated within the roots of living plants of Arabidopsis thaliana. This biogenic synthetic route produced a bionic composite material made of root components and SWCNT-COOH. The synthesis was possible exploiting the transport processes existing in the plant roots. Scanning electrochemical microscopy (SECM) measurements showed that SWCNT-COOH entered the vascular bundles of A. thaliana roots localizing within xylem vessels. SWCNT-COOH preserved their electrical properties when embedded inside the root matrix, both at a microscopic level and a macroscopic level, and did not significantly affect the mechanical properties of A. thaliana roots.
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Affiliation(s)
- Giulia Magnabosco
- Dipartimento di Chimica "Giacomo Ciamician," Alma mater Studiorum-Università di Bologna, Bologna, Italy
| | - Maria F Pantano
- Laboratory of Bio-Inspired, Bionic, Nano, Meta Materials and Mechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy
| | - Stefania Rapino
- Dipartimento di Chimica "Giacomo Ciamician," Alma mater Studiorum-Università di Bologna, Bologna, Italy
| | - Matteo Di Giosia
- Dipartimento di Chimica "Giacomo Ciamician," Alma mater Studiorum-Università di Bologna, Bologna, Italy
| | - Francesco Valle
- Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN), Consiglio Nazionale delle Ricerche, Bologna, Italy
| | - Ludovic Taxis
- Laboratory of Bio-Inspired, Bionic, Nano, Meta Materials and Mechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy
| | - Francesca Sparla
- Department of Pharmacy and Biotechnology, Alma mater Studiorum-Università di Bologna, Bologna, Italy
| | - Giuseppe Falini
- Dipartimento di Chimica "Giacomo Ciamician," Alma mater Studiorum-Università di Bologna, Bologna, Italy
| | - Nicola M Pugno
- Laboratory of Bio-Inspired, Bionic, Nano, Meta Materials and Mechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy.,School of Engineering and Materials Science, Queen Mary University of London, London, United Kingdom
| | - Matteo Calvaresi
- Dipartimento di Chimica "Giacomo Ciamician," Alma mater Studiorum-Università di Bologna, Bologna, Italy
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Paschoalino WJ, Payne NA, Pessanha TM, Gateman SM, Kubota LT, Mauzeroll J. Charge Storage in Graphene Oxide: Impact of the Cation on Ion Permeability and Interfacial Capacitance. Anal Chem 2020; 92:10300-10307. [DOI: 10.1021/acs.analchem.0c00218] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Waldemir J. Paschoalino
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
- Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP Brazil
| | - Nicholas A. Payne
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
| | - Tatiana M. Pessanha
- Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP Brazil
| | - Samantha M. Gateman
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
| | - Lauro T. Kubota
- Department of Analytical Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP Brazil
| | - Janine Mauzeroll
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
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Borghese R, Malferrari M, Brucale M, Ortolani L, Franchini M, Rapino S, Borsetti F, Zannoni D. Structural and electrochemical characterization of lawsone-dependent production of tellurium-metal nanoprecipitates by photosynthetic cells of Rhodobacter capsulatus. Bioelectrochemistry 2020; 133:107456. [DOI: 10.1016/j.bioelechem.2020.107456] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 12/19/2019] [Accepted: 01/04/2020] [Indexed: 01/07/2023]
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Abdel Aziz I, Malferrari M, Roggiani F, Tullii G, Rapino S, Antognazza MR. Light-Triggered Electron Transfer between a Conjugated Polymer and Cytochrome C for Optical Modulation of Redox Signaling. iScience 2020; 23:101091. [PMID: 32438318 PMCID: PMC7240120 DOI: 10.1016/j.isci.2020.101091] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 03/02/2020] [Accepted: 04/16/2020] [Indexed: 01/21/2023] Open
Abstract
Protein reduction/oxidation processes trigger and finely regulate a myriad of physiological and pathological cellular functions. Many biochemical and biophysical stimuli have been recently explored to precisely and effectively modulate intracellular redox signaling, due to the considerable therapeutic potential. Here, we propose a first step toward an approach based on visible light excitation of a thiophene-based semiconducting polymer (P3HT), demonstrating the realization of a hybrid interface with the Cytochrome c protein (CytC), in an extracellular environment. By means of scanning electrochemical microscopy and spectro-electrochemistry measurements, we demonstrate that, upon optical stimulation, a functional interaction between P3HT and CytC is established. Polymer optical excitation locally triggers photoelectrochemical reactions, leading to modulation of CytC redox activity, either through an intermediate step, involving reactive oxygen species formation, or via a direct photoreduction process. Both processes are triggered by light, thus allowing excellent spatiotemporal resolution, paving the way to precise modulation of protein redox signaling. Conjugated polymers and light modulate the redox state of cytochrome c protein Phototransduction processes are clarified by electrochemical microscopy The approach opens the way to selective optical triggering of protein redox state
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Affiliation(s)
- Ilaria Abdel Aziz
- Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia, via Pascoli 70/3, 20133 Milano, Italy; Politecnico di Milano, Dipartimento di Fisica, Piazza L. Da Vinci 32, 20133 Milano, Italy
| | - Marco Malferrari
- Università di Bologna, Dipartimento di Chimica "Giacomo Ciamician", via Francesco Selmi 2, 40126 Bologna, Italy
| | - Francesco Roggiani
- Università di Bologna, Dipartimento di Chimica "Giacomo Ciamician", via Francesco Selmi 2, 40126 Bologna, Italy
| | - Gabriele Tullii
- Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia, via Pascoli 70/3, 20133 Milano, Italy; Politecnico di Milano, Dipartimento di Fisica, Piazza L. Da Vinci 32, 20133 Milano, Italy
| | - Stefania Rapino
- Università di Bologna, Dipartimento di Chimica "Giacomo Ciamician", via Francesco Selmi 2, 40126 Bologna, Italy.
| | - Maria Rosa Antognazza
- Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia, via Pascoli 70/3, 20133 Milano, Italy.
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Ruggeri I, Arbizzani C, Rapino S, Soavi F. Oxygen Redox Reaction in Ionic Liquid and Ionic Liquid-like Based Electrolytes: A Scanning Electrochemical Microscopy Study. J Phys Chem Lett 2019; 10:3333-3338. [PMID: 31141369 DOI: 10.1021/acs.jpclett.9b00774] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Improving the stability of the cathode interface is one of the critical issues for the development of high-performance Li/O2 batteries. The most critical feature to address is the development of electrolytes that mitigate side reactions that bring about cathode passivation. It is well-known that the superoxide anion (O2•-) plays a critical role. Here, we propose scanning electrochemical microscopy (SECM) as an analytical tool to screen the electrolyte of Li/O2 batteries. We demonstrate that by using SECM it is possible to evaluate the stability of O2•- and of the cathode to the passivation process occurring during the oxygen redox reaction. Specifically, we report a study carried out at a glassy carbon electrode in 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and in tetraethylene glycol dimethyl ether with LiTFSI, the latter ranging from the salt-in-solvent to solvent-in-salt regions.
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Affiliation(s)
- Irene Ruggeri
- Department of Chemistry Giacomo Ciamician , Alma Mater Studiorum Bologna University , 40126 Bologna , Italy
| | - Catia Arbizzani
- Department of Chemistry Giacomo Ciamician , Alma Mater Studiorum Bologna University , 40126 Bologna , Italy
| | - Stefania Rapino
- Department of Chemistry Giacomo Ciamician , Alma Mater Studiorum Bologna University , 40126 Bologna , Italy
| | - Francesca Soavi
- Department of Chemistry Giacomo Ciamician , Alma Mater Studiorum Bologna University , 40126 Bologna , Italy
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8
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Electrochemical monitoring of reactive oxygen/nitrogen species and redox balance in living cells. Anal Bioanal Chem 2019; 411:4365-4374. [PMID: 31011787 DOI: 10.1007/s00216-019-01734-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 02/19/2019] [Accepted: 02/27/2019] [Indexed: 10/27/2022]
Abstract
Levels of reactive oxygen species (ROS) and reactive nitrogen species (RNS) in cells and cell redox balance are of great interest in live cells as they are correlated to several pathological and physiological conditions of living cells. ROS and RNS detection is limited due to their spatially restricted abundance: they are usually located in sub-cellular areas (e.g., in specific organelles) at low concentration. In this work, we will review and highlight the electrochemical approach to this bio-analytical issue. Combining electrochemical methods and miniaturization strategies, specific, highly sensitive, time, and spatially resolved measurements of cellular oxidative stress and redox balance analysis are possible. Graphical abstract In this work, we highlight and review the use of electrochemistry for the highly spatial and temporal resolved detection of ROS/RNS levels and of redox balance in living cells. These levels are central in several pathological and physiological conditions and the electrochemical approach is a vibrant bio-analytical trend in this field.
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Alam MK, Rahman MM, Rahman MM, Kim D, Asiri AM, Khan FA. In-situ synthesis of gold nanocrystals anchored graphene oxide and its application in biosensor and chemical sensor. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.01.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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10
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Malferrari M, Ghelli A, Roggiani F, Valenti G, Paolucci F, Rugolo M, Rapino S. Reactive Oxygen Species Produced by Mutated Mitochondrial Respiratory Chains of Entire Cells Monitored Using Modified Microelectrodes. ChemElectroChem 2019. [DOI: 10.1002/celc.201801424] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Marco Malferrari
- Department of Chemistry “Giacomo Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Anna Ghelli
- Department of Pharmacy and BiotechnologiesUniversity of Bologna Via F. Selmi 3 40126 Bologna Italy
| | - Francesco Roggiani
- Department of Chemistry “Giacomo Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Giovanni Valenti
- Department of Chemistry “Giacomo Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Francesco Paolucci
- Department of Chemistry “Giacomo Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Michela Rugolo
- Department of Pharmacy and BiotechnologiesUniversity of Bologna Via F. Selmi 3 40126 Bologna Italy
| | - Stefania Rapino
- Department of Chemistry “Giacomo Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
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11
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Bartolini L, Malferrari M, Lugli F, Zerbetto F, Paolucci F, Pelicci PG, Albonetti C, Rapino S. Interaction of Single Cells with 2D Organic Monolayers: A Scanning Electrochemical Microscopy Study. ChemElectroChem 2018. [DOI: 10.1002/celc.201800731] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Luca Bartolini
- Department of Chemistry “G. Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
- Department of Experimental OncologyEuropean Institute of Oncology (IEO) Via Ripamonti 435 20141 Milan Italy
| | - Marco Malferrari
- Department of Chemistry “G. Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Francesca Lugli
- Department of Chemistry “G. Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Francesco Zerbetto
- Department of Chemistry “G. Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Francesco Paolucci
- Department of Chemistry “G. Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
| | - Pier Giuseppe Pelicci
- Department of Experimental OncologyEuropean Institute of Oncology (IEO) Via Ripamonti 435 20141 Milan Italy
- Department of Oncology and Hemato-OncologyUniversity of Milan Via Santa Sofia 9 20122 Milan Italy
| | - Cristiano Albonetti
- Institute for the Study of Nanostructured Materials (ISMN)National Research Council (CNR) Via P. Gobetti 101 40129 Bologna Italy
| | - Stefania Rapino
- Department of Chemistry “G. Ciamician”University of Bologna Via F. Selmi 2 40126 Bologna Italy
- Department of Experimental OncologyEuropean Institute of Oncology (IEO) Via Ripamonti 435 20141 Milan Italy
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12
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Rahman MM, Lopa NS, Ju MJ, Lee JJ. Highly sensitive and simultaneous detection of dopamine and uric acid at graphene nanoplatelet-modified fluorine-doped tin oxide electrode in the presence of ascorbic acid. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.03.038] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Takahashi Y, Kumatani A, Shiku H, Matsue T. Scanning Probe Microscopy for Nanoscale Electrochemical Imaging. Anal Chem 2016; 89:342-357. [DOI: 10.1021/acs.analchem.6b04355] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yasufumi Takahashi
- Division
of Electrical Engineering and Computer Science, Kanazawa University, Kanazawa 920-1192, Japan
- Precursory
Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Saitama 332-0012, Japan
| | - Akichika Kumatani
- Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- Graduate
School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan
| | - Hitoshi Shiku
- Department
of Applied Chemistry, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Tomokazu Matsue
- Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- Graduate
School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan
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Xia Z, Leonardi F, Gobbi M, Liu Y, Bellani V, Liscio A, Kovtun A, Li R, Feng X, Orgiu E, Samorì P, Treossi E, Palermo V. Electrochemical Functionalization of Graphene at the Nanoscale with Self-Assembling Diazonium Salts. ACS NANO 2016; 10:7125-34. [PMID: 27299370 DOI: 10.1021/acsnano.6b03278] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
We describe a fast and versatile method to functionalize high-quality graphene with organic molecules by exploiting the synergistic effect of supramolecular and covalent chemistry. With this goal, we designed and synthesized molecules comprising a long aliphatic chain and an aryl diazonium salt. Thanks to the long chain, these molecules physisorb from solution onto CVD graphene or bulk graphite, self-assembling in an ordered monolayer. The sample is successively transferred into an aqueous electrolyte, to block any reorganization or desorption of the monolayer. An electrochemical impulse is used to transform the diazonium group into a radical capable of grafting covalently to the substrate and transforming the physisorption into a covalent chemisorption. During covalent grafting in water, the molecules retain the ordered packing formed upon self-assembly. Our two-step approach is characterized by the independent control over the processes of immobilization of molecules on the substrate and their covalent tethering, enabling fast (t < 10 s) covalent functionalization of graphene. This strategy is highly versatile and works with many carbon-based materials including graphene deposited on silicon, plastic, and quartz as well as highly oriented pyrolytic graphite.
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Affiliation(s)
- Zhenyuan Xia
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche , via Gobetti 101, 40129 Bologna, Italy
| | - Francesca Leonardi
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche , via Gobetti 101, 40129 Bologna, Italy
| | - Marco Gobbi
- ISIS and icFRC Université de Strasbourg and CNRS , 8 Allée Monge, 67000 Strasbourg, France
| | - Yi Liu
- Max Planck Institute for Polymer Research , Ackermannweg 10, Mainz 55128, Germany
| | - Vittorio Bellani
- Dipartimento di Fisica, Università degli Studi di Pavia , via Bassi 6, 27100 Pavia, Italy
| | - Andrea Liscio
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche , via Gobetti 101, 40129 Bologna, Italy
| | - Alessandro Kovtun
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche , via Gobetti 101, 40129 Bologna, Italy
| | - Rongjin Li
- Max Planck Institute for Polymer Research , Ackermannweg 10, Mainz 55128, Germany
| | - Xinliang Feng
- Max Planck Institute for Polymer Research , Ackermannweg 10, Mainz 55128, Germany
| | - Emanuele Orgiu
- ISIS and icFRC Université de Strasbourg and CNRS , 8 Allée Monge, 67000 Strasbourg, France
| | - Paolo Samorì
- ISIS and icFRC Université de Strasbourg and CNRS , 8 Allée Monge, 67000 Strasbourg, France
| | - Emanuele Treossi
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche , via Gobetti 101, 40129 Bologna, Italy
| | - Vincenzo Palermo
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche , via Gobetti 101, 40129 Bologna, Italy
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15
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Functionalization of indium tin oxide electrode with both of dendrimer-encapsulated Pt nanoparticles and chemically converted graphenes for enhanced electrochemiluminescence of luminol/H2O2. Anal Bioanal Chem 2016; 408:7165-72. [DOI: 10.1007/s00216-016-9680-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 05/13/2016] [Accepted: 06/01/2016] [Indexed: 10/21/2022]
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16
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Fiorani A, Rapino S, Fioravanti G, Valenti G, Marcaccio M, Paolucci F. Local desorption of thiols by scanning electrochemical microscopy: patterning and tuning the reactivity of self-assembled monolayers. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-015-3020-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Molina J, Fernández J, García C, del Río A, Bonastre J, Cases F. Electrochemical characterization of electrochemically reduced graphene coatings on platinum. Electrochemical study of dye adsorption. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.03.054] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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18
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Bourgeteau T, Le Vot S, Bertucchi M, Derycke V, Jousselme B, Campidelli S, Cornut R. New Insights into the Electronic Transport of Reduced Graphene Oxide Using Scanning Electrochemical Microscopy. J Phys Chem Lett 2014; 5:4162-4166. [PMID: 26278948 DOI: 10.1021/jz502224f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The present work investigates the electronic conduction of reduced graphene oxide flakes and the coupling between flakes through a combined SECM (scanning electrochemical microscopy), AFM, and SEM analysis. Images of individual and interconnected flakes directly reveal the signature of the contact resistance between flakes in a noncontact and substrate-independent way. Quantitative evaluation of the parameters is achieved with the support of numerical simulations to interpret the experimental results. The interflakes contact resistance importantly impacts the transport of electrons, which can be anticipated as a key parameter in r-GO-based materials used in fuel cells, lithium batteries, supercapacitors, and organic electronic devices.
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Affiliation(s)
- Tiphaine Bourgeteau
- CEA Saclay, IRAMIS, NIMBE, LICSEN, Bat. 466, Gif-sur-Yvette, Cedex F-91191, France
| | - Steven Le Vot
- CEA Saclay, IRAMIS, NIMBE, LICSEN, Bat. 466, Gif-sur-Yvette, Cedex F-91191, France
| | - Michael Bertucchi
- CEA Saclay, IRAMIS, NIMBE, LICSEN, Bat. 466, Gif-sur-Yvette, Cedex F-91191, France
| | - Vincent Derycke
- CEA Saclay, IRAMIS, NIMBE, LICSEN, Bat. 466, Gif-sur-Yvette, Cedex F-91191, France
| | - Bruno Jousselme
- CEA Saclay, IRAMIS, NIMBE, LICSEN, Bat. 466, Gif-sur-Yvette, Cedex F-91191, France
| | - Stéphane Campidelli
- CEA Saclay, IRAMIS, NIMBE, LICSEN, Bat. 466, Gif-sur-Yvette, Cedex F-91191, France
| | - Renaud Cornut
- CEA Saclay, IRAMIS, NIMBE, LICSEN, Bat. 466, Gif-sur-Yvette, Cedex F-91191, France
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