The structure of Ag nanoparticles of different size, supported on the cerium oxide (111) surface, was investigated by X-ray absorption fine structure at the Ag K-edge. The results of the data analysis in the near and extended energy range are interpreted with the help of the results obtained by X-ray photoelectron spectroscopy and scanning tunneling microscopy measurements and allow to obtain a detailed atomic scale description of the model system investigated. The Ag nanoparticles have an average size of a few tens of angstroms, which increases with increasing deposited Ag amount. The nanoparticles show a slight tendency to nucleate at the step edges between different cerium oxide layers and they have a face centered cubic structure with an Ag-Ag interatomic distance contracted by 3-4% with respect to the bulk value. The interatomic distance contraction is mainly ascribed to dimensionality induced effects, while epitaxial effects have a minor role. The presence of Ag-O bonds at the interface between the nanoparticles and the supporting oxide is also detected. The Ag-O interatomic distance decreases with decreasing nanoparticle size.
|Data di pubblicazione:||2015|
|Titolo:||Structure and Morphology of Silver Nanoparticles on the (111) Surface of Cerium Oxide|
|Autori:||Benedetti, Francesco; Luches, Paola; Spadaro, Maria Chiara; Gasperi, Gabriele; D'Addato, Sergio; Valeri, Sergio; Boscherini, Federico|
|Digital Object Identifier (DOI):||10.1021/jp510527|
|Appare nelle tipologie:||Articolo su rivista|
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