Size-dependent stability of supported gold nanostructures onto ceria : an HRTEM study
Langue
en
Article de revue
Ce document a été publié dans
Journal of Physical Chemistry C. 2009, vol. 113, n° 21, p. 9275-9283
American Chemical Society
Résumé en anglais
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/CeO<sub>2</sub> interface confirms the ...Lire la suite >
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/CeO<sub>2</sub> 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 CeO<sub>2−<i>x</i></sub> layer was found and a four-step process was experimentally underlined.< Réduire
Mots clés en anglais
Gold
Nanoparticles
HRTEM
Size
Origine
Importé de halUnités de recherche