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Schenk S, Krahn O, Cockayne E, Meyerheim HL, de Boissieu M, Förster S, Widdra W. 2D honeycomb transformation into dodecagonal quasicrystals driven by electrostatic forces. Nat Commun 2022; 13:7542. [PMID: 36477452 PMCID: PMC9729568 DOI: 10.1038/s41467-022-35308-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 11/25/2022] [Indexed: 12/13/2022] Open
Abstract
Dodecagonal oxide quasicrystals are well established as examples of long-range aperiodic order in two dimensions. However, despite investigations by scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), low-energy electron microscopy (LEEM), photoemission spectroscopy as well as density functional theory (DFT), their structure is still controversial. Furthermore, the principles that guide the formation of quasicrystals (QCs) in oxides are elusive since the principles that are known to drive metallic QCs are expected to fail for oxides. Here we demonstrate the solution of the oxide QC structure by synchrotron-radiation based surface x-ray diffraction (SXRD) refinement of its largest-known approximant. The oxide QC formation is forced by large alkaline earth metal atoms and the reduction of their mutual electrostatic repulsion. It drives the n = 6 structure of the 2D Ti2O3 honeycomb arrangement via Stone-Wales transformations into an ordered structure with empty n = 4, singly occupied n = 7 and doubly occupied n = 10 rings, as supported by DFT.
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Affiliation(s)
- Sebastian Schenk
- grid.9018.00000 0001 0679 2801Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany
| | - Oliver Krahn
- grid.9018.00000 0001 0679 2801Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany
| | - Eric Cockayne
- grid.94225.38000000012158463XMaterial Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 USA
| | - Holger L. Meyerheim
- grid.450270.40000 0004 0491 5558Max Planck Institute of Microstructure Physics, 06120 Halle, Germany
| | - Marc de Boissieu
- grid.462639.c0000 0001 2170 1576Universite Grenoble Alpes, CNRS, SIMaP, St Martin d’Heres, France
| | - Stefan Förster
- grid.9018.00000 0001 0679 2801Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany
| | - Wolf Widdra
- grid.9018.00000 0001 0679 2801Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany
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Wang J, Ma Y, Mahapatra M, Kang J, Senanayake SD, Tong X, Stacchiola DJ, White MG. Surface structure of mass-selected niobium oxide nanoclusters on Au(111). NANOTECHNOLOGY 2021; 32:475601. [PMID: 34380123 DOI: 10.1088/1361-6528/ac1cc0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/10/2021] [Indexed: 06/13/2023]
Abstract
The structures formed by the deposition of mass-selected niobium oxide clusters, Nb3Oy(y = 5, 6, 7), onto Au(111) were studied by scanning tunneling microscopy. The as-deposited Nb3O7clusters assemble into large dendritic structures that grow on the terraces as well as extend from the top and bottom of step edges. The Nb3O6cluster also forms dendritic assemblies but they are generally much smaller in size. The assemblies are composed of smaller discrete structures (<1 nm) which are likely to be single clusters. The dendritic assemblies for both the Nb3O7and Nb3O6clusters have fractal dimensions of about 1.7 which is very close to that expected for simple diffusion limited aggregation. Annealing the Nb3O7,6/Au(111) surfaces up to 550 K results in changes in assembly sizes and increases in heights, while heating to 700 results in the disruption of the assemblies into smaller structures. By contrast, the as-deposited Nb3O5/Au(111) surface at RT exhibits compact cluster structures which become 3D nanoparticles when annealed above 550 K. Differences in the observed surface structures and thermal stability are attributed to differences in metal-oxygen stoichiometry which can influence cluster binding energies, mobility and inter-cluster interactions.
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Affiliation(s)
- Jason Wang
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
| | - Yilin Ma
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
| | - Mausumi Mahapatra
- Chemistry Division, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Jindong Kang
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
| | - Sanjaya D Senanayake
- Chemistry Division, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Xiao Tong
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Dario J Stacchiola
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Michael G White
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
- Chemistry Division, Brookhaven National Laboratory, Upton 11973 NY, United States of America
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von Boehn B, Imbihl R. Dynamics of Ultrathin Vanadium Oxide Layers on Rh(111) and Rh(110) Surfaces During Catalytic Reactions. Front Chem 2020; 8:707. [PMID: 32974277 PMCID: PMC7472780 DOI: 10.3389/fchem.2020.00707] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 07/09/2020] [Indexed: 11/13/2022] Open
Abstract
Over the past 35 years rate oscillations and chemical wave patterns have been extensively studied on metal surfaces, while little is known about the dynamics of catalytic oxide surfaces under reaction conditions. Here we report on the behavior of ultrathin V oxide layers epitaxially grown on Rh(111) and Rh(110) single crystal surfaces during catalytic methanol oxidation. We use photoemission electron microscopy and low-energy electron microscopy to study the surface dynamics in the 10-6 to 10-2 mbar range. On VO x /Rh(111) we find a ripening mechanism in which VO x islands of macroscopic size move toward each other and coalesce under reaction conditions. A polymerization/depolymerization mechanism of VO x that is sensitive to gradients in the oxygen coverage explains this behavior. The existence of a substructure in VO x islands gives rise to an instability, in which a VO x island shrinks and expands around a critical radius in an oscillatory manner. At 10-2 mbar the VO x islands are no longer stable but they disintegrate, leading to turbulent redistribution dynamics of VO x . On the more open and thermodynamically less stable Rh(110) surface the behavior of VO x is much more complex than on Rh(111), as V can also populate subsurface sites. At low V coverage, one finds traveling interface pulses in the bistable range. A state-dependent anisotropy of the surface is presumably responsible for intriguing chemical wave patterns: wave fragments traveling along certain crystallographic directions, and coexisting different front geometries in the range of dynamic bistability. Annealing to 1000 K causes the formation of macroscopic VO x islands. Under more reducing conditions dendritic growth of a VO x overlayer is observed.
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Affiliation(s)
- Bernhard von Boehn
- Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Hanover, Germany
| | - Ronald Imbihl
- Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Hanover, Germany
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von Boehn B, Penschke C, Li X, Paier J, Sauer J, Krisponeit JO, Flege JI, Falta J, Marchetto H, Franz T, Lilienkamp G, Imbihl R. Reaction dynamics of metal/oxide catalysts: Methanol oxidation at vanadium oxide films on Rh(1 1 1) from UHV to 10−2 mbar. J Catal 2020. [DOI: 10.1016/j.jcat.2020.03.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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von Boehn B, Mehrwald S, Imbihl R. Hole patterns in ultrathin vanadium oxide layers on a Rh(111) surface during catalytic oxidation reactions with NO. CHAOS (WOODBURY, N.Y.) 2018; 28:045117. [PMID: 31906638 DOI: 10.1063/1.5020360] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Various oxidation reactions with NO as oxidant have been investigated on a partially VOx covered Rh(111) surface (θV = 0.3 MLE) in the 10-4 mbar range, using photoelectron emission microscopy (PEEM) as spatially resolving method. The PEEM studies are complemented by rate measurements and by low-energy electron diffraction. In catalytic methanol oxidation with NO and in the NH3 + NO reaction, we observe that starting from a homogeneous surface with increasing temperature first a stripe pattern develops, followed by a pattern in which macroscopic holes of nearly bare metal surface are surrounded by a VOx film. These hole patterns represent just the inverse of the VOx distribution patterns seen if O2 instead of NO is used as oxidant.
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Affiliation(s)
- Bernhard von Boehn
- Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstrasse 3a, D-30167 Hannover, Germany
| | - Sarah Mehrwald
- Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstrasse 3a, D-30167 Hannover, Germany
| | - Ronald Imbihl
- Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstrasse 3a, D-30167 Hannover, Germany
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von Boehn B, Preiss A, Imbihl R. Dynamics of ultrathin V-oxide layers on Rh(111) in catalytic oxidation of ammonia and CO. Phys Chem Chem Phys 2016; 18:19713-21. [PMID: 27380822 DOI: 10.1039/c6cp03637f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic oxidation of ammonia and CO has been studied in the 10−4 mbar range using a catalyst prepared by depositing ultra-thin vanadium oxide layers on Rh(111) (θV ≈ 0.2 MLE).
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Affiliation(s)
- B. von Boehn
- Institut für Physikalische Chemie und Elektrochemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
| | - A. Preiss
- Institut für Physikalische Chemie und Elektrochemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
| | - R. Imbihl
- Institut für Physikalische Chemie und Elektrochemie
- Leibniz Universität Hannover
- D-30167 Hannover
- Germany
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Hesse M, von Boehn B, Locatelli A, Sala A, Menteş TO, Imbihl R. Island Ripening via a Polymerization-Depolymerization Mechanism. PHYSICAL REVIEW LETTERS 2015; 115:136102. [PMID: 26451569 DOI: 10.1103/physrevlett.115.136102] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Indexed: 06/05/2023]
Abstract
In catalytic methanol oxidation on ultrathin vanadium oxide layers on Rh(111) (Θ_{V}≈0.2 monolayer equivalent) we observe a 2D ripening of the VO_{x} islands that is controlled by the catalytic reaction. Neighboring VO_{x} islands move under reaction conditions towards each other and coalesce. The motion and the coalescence of the islands are explained by a polymerization-depolymerization equilibrium that is sensitive to gradients in the adsorbate coverages.
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Affiliation(s)
- Martin Hesse
- Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3-3a, D-30167 Hannover, Germany
| | - Bernhard von Boehn
- Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3-3a, D-30167 Hannover, Germany
| | - Andrea Locatelli
- Elettra-Sincrotrone Trieste, S.C.p.A., S.S. 14, km 163.5 in AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - Alessandro Sala
- Elettra-Sincrotrone Trieste, S.C.p.A., S.S. 14, km 163.5 in AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - Tevfik O Menteş
- Elettra-Sincrotrone Trieste, S.C.p.A., S.S. 14, km 163.5 in AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - Ronald Imbihl
- Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3-3a, D-30167 Hannover, Germany
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Wang LF, Xie L, Fang HL, Li YF, Zhang XB, Wang B, Zhang YF, Huang X. On the structural and electronic properties of hexanuclear vanadium oxide clusters V6On(-/0) (n=12-15): is V6O12 cluster planar or cage-like? SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 131:446-454. [PMID: 24835948 DOI: 10.1016/j.saa.2014.04.094] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 03/24/2014] [Accepted: 04/13/2014] [Indexed: 06/03/2023]
Abstract
Density functional theory (DFT) calculations are carried out to investigate the structural and electronic properties of a series of hexanuclear vanadium oxide clusters V6On(-/0) (n=12-15). Generalized Koopmans' theorem is applied to predict the vertical detachment energies (VDEs) and simulate the photoelectron spectra (PES) for V6On(-) (n=12-15) clusters. Extensive DFT calculations are performed in search of the lowest-energy structures for both the anions and neutrals. All of these clusters appear to prefer the polyhedral cage structures, in contrast to the planar star-like structures observed in prior model surface studies for the V6O12 cluster. Molecular orbitals are performed to analyze the chemical bonding in the hexanuclear vanadium oxide clusters and provide insights into the sequential oxidation of V6On(-) (n=12-15) clusters. The V6On(-) (n=12-15) clusters possess well-defined V(5+) and V(3+) sites, and may serve as molecular models for surface defects. Electron spin density analyses show that the unpaired electrons in V6On(-) (n=12-14) clusters are primarily localized on the V(3+) sites rather than on the V(5+) sites. The difference gas phase versus model surface structures of V6O12 hints the critical roles of cluster-substrate interactions in stabilizing the planar V6O12 cluster on model surfaces.
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Affiliation(s)
- Ling-Fei Wang
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China
| | - Lu Xie
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China
| | - Hong-Ling Fang
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China
| | - Yun-Fei Li
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China
| | - Xiao-Bin Zhang
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China
| | - Bin Wang
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China
| | - Yong-Fan Zhang
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China; Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen, Fujian 361005, PR China.
| | - Xin Huang
- Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, PR China; Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen, Fujian 361005, PR China.
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Tang Z, Wang S, Zhang L, Ding D, Chen M, Wan H. Effects of O2 pressure on the oxidation of VOx/Pt(111). Phys Chem Chem Phys 2013; 15:12124-31. [DOI: 10.1039/c3cp50712b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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10
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Surnev S, Fortunelli A, Netzer FP. Structure-property relationship and chemical aspects of oxide-metal hybrid nanostructures. Chem Rev 2012; 113:4314-72. [PMID: 23237602 DOI: 10.1021/cr300307n] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Svetlozar Surnev
- Surface and Interface Physics, Institute of Physics, Karl-Franzens University, Graz A-8010 Graz, Austria
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Wang HQ, Li HF. Probing the structural and electronic properties of small vanadium dioxide clusters by density functional theory and comparison with experimental photoelectron spectroscopy. J Chem Phys 2012; 137:164304. [DOI: 10.1063/1.4760658] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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12
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Zn3(VO4)2 prepared by magnetron sputtering: microstructure and optical property. APPLIED NANOSCIENCE 2012. [DOI: 10.1007/s13204-012-0162-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Pandey M, Pala RGS. Stabilization and growth of non-native nanocrystals at low and atmospheric pressures. J Chem Phys 2012; 136:044703. [DOI: 10.1063/1.3678181] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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Wang HQ, Li HF, Kuang XY. Probing the structural and electronic properties of small vanadium monoxide clusters. Phys Chem Chem Phys 2012; 14:5272-83. [DOI: 10.1039/c2cp40112f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Most metals are oxidized under ambient conditions, and metal oxides show interesting and technologically promising properties. This has motivated much recent research on oxide surfaces. The combination of scanning tunneling microscopy with first-principles density functional theory–based computational techniques provides an atomic-scale view of the properties of metal-oxide materials. Surface polarity is a key concept for predicting the stability of oxide surfaces and is discussed using ZnO as an example. This review also highlights the role of surface defects for surface reactivity, and their interplay with defects in the bulk, for the case of TiO2. Ultrathin metal-oxide films, grown either through reactive evaporation on metal single crystals or through oxidation of metal alloys (such as Al2O3/NiAl), have gained popularity as supports for planar model catalysts. The surface oxides that form upon oxidation on Pt-group metals (e.g., Ru, Rh, Pd, and Pt) are considered as model systems for CO oxidation.
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Affiliation(s)
- Ulrike Diebold
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
| | - Shao-Chun Li
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
| | - Michael Schmid
- Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Vienna, Austria
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Isomura N, Wu X, Watanabe Y. Atomic-resolution imaging of size-selected platinum clusters on TiO2(110) surfaces. J Chem Phys 2009; 131:164707. [DOI: 10.1063/1.3251786] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Wang YQ, Li ZC, Zhang ZJ. Preparation of V2O5 thin film and its optical characteristics. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11706-009-0016-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Jakob P, Anhut K, Schnur S, Gross A. Monodisperse microisland formation on Ni/Ru(0001) monolayers. PHYSICAL REVIEW LETTERS 2008; 101:206101. [PMID: 19113357 DOI: 10.1103/physrevlett.101.206101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2008] [Indexed: 05/27/2023]
Abstract
The creation of identical microislands consisting of Ni trimers and multiples thereof on Ru(0001) induced by oxygen adsorption has been observed using scanning tunnelling microscopy. The island formation is caused by an oxygen induced expulsion of Ni atoms or trimers out of the moiré-distorted (densified) Ni monolayer. The exceptional stability of the Ni trimers is attributed to oxygen attachment, forming Ni-oxygen composites, as verified by detailed density functional theory calculations. The high density, identical structure, and notable thermal stability of these islands open up new perspectives for the study of the properties of nanostructured surfaces.
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Affiliation(s)
- Peter Jakob
- Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften, Philipps-Universität Marburg, D-35032 Marburg, Germany.
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Wang Y, Li Z, Sheng X, Zhang Z. Synthesis and optical properties of V2O5 nanorods. J Chem Phys 2007; 126:164701. [PMID: 17477618 DOI: 10.1063/1.2722746] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A two-step method was proposed in synthesizing V2O5 nanorods on planar substrates, i.e., depositing a V2O3 thin film at approximately 220 degrees C (by heating a pure sheet of vanadium in a rough vacuum) and then heating it in air at approximately 400 degrees C. The V2O5 nanorods produced by this technique are single crystalline and could emit intense visible light at room temperature, possibly due to some defects such as oxygen vacancies which got involved during growth. This study provides a simple and low-substrate-temperature route in fabricating V2O5 nanorods on planar substrates, which might be also applicable to other metal oxides.
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Affiliation(s)
- Yuquan Wang
- Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
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Kim J, Bondarchuk O, Kay BD, White J, Dohnálek Z. Preparation and characterization of monodispersed WO3 nanoclusters on TiO2(110). Catal Today 2007. [DOI: 10.1016/j.cattod.2006.07.050] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Orzali T, Casarin M, Granozzi G, Sambi M, Vittadini A. Bottom-up assembly of single-domain titania nanosheets on (1 x 2)-Pt(110). PHYSICAL REVIEW LETTERS 2006; 97:156101. [PMID: 17155341 DOI: 10.1103/physrevlett.97.156101] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2006] [Indexed: 05/12/2023]
Abstract
A bottom-up route towards the synthesis of titania nanosheets is explored, alternative to the exfoliation of layered titanates. Nanosheets are assembled from the constituent elements and epitaxially matched to a suitable substrate: (1 x 2)-Pt(110). Their basic lepidocrocite structure is modulated at the nanoscale due to coincidence with the substrate. Density functional calculations reveal the structure details of the nanosheet, which is also shown to be in close relationship with a (001)-oriented anatase bilayer.
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Affiliation(s)
- Tommaso Orzali
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
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Bondarchuk O, Huang X, Kim J, Kay BD, Wang LS, White JM, Dohnálek Z. Formation of Monodisperse (WO3)3 Clusters on TiO2(110). Angew Chem Int Ed Engl 2006; 45:4786-9. [PMID: 16795101 DOI: 10.1002/anie.200600837] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Oleksandr Bondarchuk
- Center for Materials Chemistry, Texas Materials Institute, University of Texas, Austin, TX 78712, USA
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Bondarchuk O, Huang X, Kim J, Kay BD, Wang LS, White JM, Dohnálek Z. Formation of Monodisperse (WO3)3 Clusters on TiO2(110). Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600837] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sedona F, Agnoli S, Granozzi G. Ultrathin Wagon-Wheel-like TiOx Phases on Pt(111): A Combined Low-Energy Electron Diffraction and Scanning Tunneling Microscopy Investigation. J Phys Chem B 2006; 110:15359-67. [PMID: 16884256 DOI: 10.1021/jp062180q] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ultrathin ordered titanium oxide films on a Pt(111) surface have been prepared by reactive deposition and characterized by low-energy electron diffraction and scanning tunneling microscopy (STM). According to the postdeposition annealing condition, three different phases have been prepared which show a wagon-wheel-like (hereafter ww) morphological pattern. Two of them can be prepared as single phases (w- and w'-TiO(x)) and one (w(int)-TiO(x)) as a mixed phase which always coexists with at least one of the other two phases. All of them are formed by a Ti-O bilayer, where the Ti atoms are located at the interface with the substrate, but they show a rather distinct STM ww pattern. The experimental STM contrast has been discussed on the basis of a Moiré-like model, i.e., as deriving from a modulation of the Ti occupancy of the different substrate sites (i.e., hollow, bridge and on-top sites). The major part of the STM data can be easily interpreted on the basis of this simplified model.
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Affiliation(s)
- Francesco Sedona
- Dipartimento di Scienze Chimiche and Unità di Ricerca INFM-CNR and INSTM, Università di Padova, Via Marzolo, I-35131 Padova, Italy
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Asmis KR, Santambrogio G, Brümmer M, Sauer J. Polyhedral Vanadium Oxide Cages: Infrared Spectra of Cluster Anions and Size-Induced d Electron Localization. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462894] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Asmis KR, Santambrogio G, Brümmer M, Sauer J. Polyhedral Vanadium Oxide Cages: Infrared Spectra of Cluster Anions and Size-Induced d Electron Localization. Angew Chem Int Ed Engl 2005; 44:3122-5. [PMID: 15827946 DOI: 10.1002/anie.200462894] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Knut R Asmis
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
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Schoiswohl J, Surnev S, Sock M, Ramsey MG, Kresse G, Netzer FP. Thermodynamically Controlled Self-Assembly of Two-Dimensional Oxide Nanostructures. Angew Chem Int Ed Engl 2004; 43:5546-9. [PMID: 15484231 DOI: 10.1002/anie.200460150] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Johannes Schoiswohl
- Institut für Experimentalphysik, Karl-Franzens-Universität Graz, 8010 Graz, Austria
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30
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Schoiswohl J, Surnev S, Sock M, Ramsey MG, Kresse G, Netzer FP. Thermodynamisch kontrollierte Selbstorganisation von zweidimensionalen Oxid-Nanostrukturen. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200460150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fernández-García M, Martínez-Arias A, Hanson JC, Rodriguez JA. Nanostructured Oxides in Chemistry: Characterization and Properties. Chem Rev 2004; 104:4063-104. [PMID: 15352786 DOI: 10.1021/cr030032f] [Citation(s) in RCA: 803] [Impact Index Per Article: 40.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M Fernández-García
- Instituto de Catálisis y Petroleoquímica, CSIC, C/ Marie Curie s/n, Campus Cantoblanco, 28049-Madrid, Spain
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