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Strain Field in Ultrasmall Gold Nanoparticles Supported on Cerium-Based Mixed Oxides. Key Influence of the Support Redox State

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Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica. Facultad Ciencias. Universidad de Cádiz. Campus Rio San Pedro, Puerto Real, 11510 Cádiz, Spain
Université Grenoble Alpes, F-38000 Grenoble, France CEA-INAC/UJF-Grenoble 1 UMR-E, SP2M, LEMMA, Minatec Grenoble, F-38054, France
§ Departments of Chemistry and Physics, University of York, The York JEOL Nanocentre, Heslington, York YO10 5DD, United Kingdom
Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
*E-mail: [email protected]. FAX: +34-956-016288.
Cite this: Langmuir 2016, 32, 17, 4313–4322
Publication Date (Web):April 8, 2016
Copyright © 2016 American Chemical Society
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Using a method that combines experimental and simulated Aberration-Corrected High Resolution Electron Microscopy images with digital image processing and structure modeling, strain distribution maps within gold nanoparticles relevant to real powder type catalysts, i.e., smaller than 3 nm, and supported on a ceria-based mixed oxide have been determined. The influence of the reduction state of the support and particle size has been examined. In this respect, it has been proven that reduction even at low temperatures induces a much larger compressive strain on the first {111} planes at the interface. This increase in compression fully explains, in accordance with previous DFT calculations, the loss of CO adsorption capacity of the interface area previously reported for Au supported on ceria-based oxides.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.langmuir.6b00758.

  • Particle size distribution, digital diffraction pattern, characteristics of the modeled gold nanoparticles, peak intensity analysis, index of the atomic columns, strain map for simulated images, and study of the influence of Poisson noise on strain determination (PDF)

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