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Local Electronic Structure and Density of Edge and Facet Atoms at Rh Nanoclusters Self-Assembled on a Graphene Template (Articolo in rivista)

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Local Electronic Structure and Density of Edge and Facet Atoms at Rh Nanoclusters Self-Assembled on a Graphene Template (Articolo in rivista) (literal)

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Alberto Cavallin (1,2); Monica Pozzo (3); Cristina Africh (4); Alessandro Baraldi (1,4); Erik Vesselli (1,4); Carlo Dri (4); Giovanni Comelli (1,4); Rosanna Larciprete (5); Paolo Lacovig (6); Silvano Lizzi (6); Dario Alfè (3,7) (2012)
Local Electronic Structure and Density of Edge and Facet Atoms at Rh Nanoclusters Self-Assembled on a Graphene Template
in ACS nano; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Alberto Cavallin (1,2); Monica Pozzo (3); Cristina Africh (4); Alessandro Baraldi (1,4); Erik Vesselli (1,4); Carlo Dri (4); Giovanni Comelli (1,4); Rosanna Larciprete (5); Paolo Lacovig (6); Silvano Lizzi (6); Dario Alfè (3,7) (literal)

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1 Physics Department and CENMAT, University of Trieste, Via Valerio 2, I-34127 Trieste, Italy, 2 Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, Station 3, CH-1015 Lausanne, Switzerland, 3 Department of Earth Sciences, Department of Physics and Astronomy, and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom, 4 IOM-CNR Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5,I-34149 Trieste, Italy, 5 CNR-Institute for Complex Systems, Via Fosso del Cavaliere 100, 00133 Roma, Italy, 6 Sincrotrone Trieste S.C.p.A., Area Science Park,S.S. 14 Km 163.5, I-34149 Trieste, Italy, 7 IOM-CNR, DEMOCRITOS National Simulation Centre, I-34100 Trieste, Italy (literal)

Titolo

Local Electronic Structure and Density of Edge and Facet Atoms at Rh Nanoclusters Self-Assembled on a Graphene Template (literal)

Abstract

The chemical and physical properties of nanodusters largely depend on their sizes and shapes. This is partly due to finite size effects influencing the local electronic structure of the nanocluster atoms which are located on the nanofacets and on their edges. Here we present a thorough study on graphene-supported Rh nanocluster assemblies and their geometry-dependent electronic structure obtained by combining high-energy resolution core level photoelectron spectroscopy, scanning tunneling microscopy, and density functional theory. We demonstrate the possibility to finely control the morphology and the degree of structural order of Rh clusters grown in register with the template surface of graphene/Ir(111). By comparing measured and calculated core electron binding energies, we identify edge, facet, and bulk atoms of the nanodusters. We describe how small interatomic distance changes occur while varying the nanoduster size, substantially modifying the properties of surface atoms. The properties of under-coordinated Rh atoms are discussed in view of their importance In heterogeneous catalysis and magnetism. (literal)

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