GROWTH, STRUCTURE AND CHEMICAL-PROPERTIES OF FEO OVERLAYERS ON PT(100) AND PT(111)

被引：84

作者：

VURENS, GH

MAURICE, V

SALMERON, M

SOMORJAI, GA

机构：

[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

[2] UNIV PARIS 06,ECOLE NATL SUPER CHIM PARIS,PHYSICOCHIM SURFACES LAB,UA 425,F-75231 PARIS 05,FRANCE

来源：

SURFACE SCIENCE | 1992年 / 268卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0039-6028(92)90960-E

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：

Iron oxide was deposited on Pt(111) and Pt(100). In both cases the growth mode appears to be layer-by-layer for the first few layers, as indicated by Auger and ion scattering spectroscopies. Ordered structures were formed after annealing as indicated by LEED with (10 x 10) and c(2 x 10) expitaxial relationships, respectively. The Fe/Pt atomic ratio was the same for both substrates and the stoichiometry was approximately Fe:O = 1:1, with the (100) substrate containing less O relative to Fe than the (111) substrate. The oxidation state of Fe is 2 according to XPS. A model is proposed for both overlayers consisting of an FeO(111) bilayer of Fe2 and O2-. The chemical properties of these two oxide monolayers were found to be similar in regard to H2O adsorption, but very different toward CO chemisorption. Their stability towards alkali metal deposition was found to be different also.

引用

页码：170 / 178

页数：9

共 22 条

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