MAJIMEL, Jérôme; MAJIMEL, Mélanie; MOOG, Iona; FÉRAL-MARTIN, Cédric; TRÉGUER-DELAPIERRE, Mona

doi:10.1021/jp9001115

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MAJIMEL, Jérôme
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MAJIMEL, Mélanie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MOOG, Iona
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Physical Chemistry C. 2009, vol. 113, n° 21, p. 9275-9283

American Chemical Society

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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.< Leer menos

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Gold

Nanoparticles

HRTEM

Size

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Size-dependent stability of supported gold nanostructures onto ceria : an HRTEM study

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