Size-Dependent Stability of Supported Gold Nanostructures onto Ceria: an HRTEM Study

Gold nanoparticles of various sizes, supported onto ceria, were synthesized using both deposition−precipitation and coprecipitation methods. Whatever the size, the study of the Au/CeO2 interface confirms the existence of two preferential orientation relationships with a dislocation network which com...

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Bibliographic Details
Published inJournal of physical chemistry. C Vol. 113; no. 21; pp. 9275 - 9283
Main Authors Majimel, J, Lamirand-Majimel, M, Moog, I, Feral-Martin, C, Tréguer-Delapierre, M
Format Journal Article
LanguageEnglish
Published American Chemical Society 28.05.2009
Subjects
C: Surfaces, Interfaces, Catalysis
Chemical Sciences
Material chemistry
Nanoparticles
Gold
Size
HRTEM
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Summary:Gold nanoparticles of various sizes, supported onto ceria, were synthesized using both deposition−precipitation and coprecipitation methods. Whatever the size, the study of the Au/CeO2 interface confirms the existence of two preferential orientation relationships with a dislocation network which compensates the 25% interfacial lattice mismatch. Behaviors of supported gold nanostructures under the electron beam were examined by high-resolution transmission electron microscopy (HRTEM). The thermal stability of the gold nanostructures was found to be strongly affected by the particle size. For small nanostructures (<5 nm), reversible shrinkage of gold layer by layer onto ceria surface was observed. For larger ones, a progressive and irreversible encapsulation by a CeO2−x layer was found and a four-step process was experimentally underlined.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp9001115