Imaging Nanostructural Modifications Induced by Electronic Metal−Support Interaction Effects at Au||Cerium-Based Oxide Nanointerfaces

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Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro, E-11510 Puerto Real (Cádiz), Spain
CEA-INAC/UJF-Grenoble1 UMR-E, SP2M, LEMMA, Minatec Grenoble F-38054, France
§ Laboratoire de Physique des Solides, UMR 850 University Paris Sud, 91405 Orsay, France
Departments of Chemistry and Physics, University of York, JEOL Nanocentre, Heslington, York YO10 5DD, United Kingdom
*Address correspondence [email protected]
Cite this: ACS Nano 2012, 6, 8, 6812–6820
Publication Date (Web):July 12, 2012
https://doi.org/10.1021/nn301557u
Copyright © 2012 American Chemical Society
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Abstract

A variety of advanced (scanning) transmission electron microscopy experiments, carried out in aberration-corrected equipment, provide direct evidence about subtle structural changes taking place at nanometer-sized Au||ceria oxide interfaces, which agrees with the occurrence of charge transfer effects between the reduced support and supported gold nanoparticles suggested by macroscopic techniques. Tighter binding of the gold nanoparticles onto the ceria oxide support when this is reduced is revealed by the structural analysis. This structural modification is accompanied by parallel deactivation of the CO chemisorption capacity of the gold nanoparticles, which is interpreted in exact quantitative terms as due to deactivation of the gold atoms at the perimeter of the Au||cerium oxide interface.

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