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

被引：39

作者：

Luches, P. ^{[1
]}

Pagliuca, F. ^{[1
,2
]}

Valeri, S. ^{[1
,2
]}

机构：

[1] CNR, Ist Nanosci, I-41125 Modena, Italy

[2] Dipartimento Sci Fis Informat & Matemat, I-41125 Modena, Italy

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 35期

关键词：

DEFECT STRUCTURE; THIN-FILMS; SINGLE-CRYSTAL; CEO2(111); SURFACES; REDUCTION; RU(0001); GROWTH; XPS;

D O I：

10.1039/c4cp02723j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：18848 / 18857

页数：10

共 46 条

[1] Cerium oxides and cerium-platinum surface alloys on Pt(111) single-crystal surfaces studied by scanning tunneling microscopy [J].