Issue 35, 2014

Structural and morphological modifications of thermally reduced cerium oxide ultrathin epitaxial films on Pt(111)

Abstract

The modifications of the stoichiometry, morphology and surface structure of cerium oxide ultrathin films induced by thermal treatments under vacuum and oxygen partial pressure were studied using in situ X-ray photoemission spectroscopy, scanning tunnelling microscopy and low energy electron diffraction. The effect of the film nominal thickness, heating temperature and heating time on the degree of reduction of the film was investigated. The reduction is more relevant on the film surface, where different ordered surface structures were observed at different degrees of reduction for very thin films. The obtained results are discussed taking into account the dimensionality of the oxide and the effects of the proximity of the Pt substrate. After reduction it was always possible to re-oxidize the films back to their original oxidation state by thermal treatment under oxygen-rich conditions.

Graphical abstract: Structural and morphological modifications of thermally reduced cerium oxide ultrathin epitaxial films on Pt(111)

Article information

Article type
Paper
Submitted
20 Jun 2014
Accepted
23 Jul 2014
First published
24 Jul 2014

Phys. Chem. Chem. Phys., 2014,16, 18848-18857

Author version available

Structural and morphological modifications of thermally reduced cerium oxide ultrathin epitaxial films on Pt(111)

P. Luches, F. Pagliuca and S. Valeri, Phys. Chem. Chem. Phys., 2014, 16, 18848 DOI: 10.1039/C4CP02723J

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