Cluster size dependence of Pt core-level shifts for mass-selected Pt clusters on TiO2(110) surfaces

被引：21

作者：

Isomura, Noritake ^{[1
]}

Wu, Xingyang ^{[2
]}

Hirata, Hirohito ^{[3
]}

Watanabe, Yoshihide ^{[1
]}

机构：

[1] Toyota Cent Res & Dev Labs Inc, Aichi 4801192, Japan

[2] Shanghai Univ, Sch Mechatron Engn & Automat, Shanghai 200072, Peoples R China

[3] Toyota Motor Co Ltd, Shizuoka 4101193, Japan

来源：

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A | 2010年 / 28卷 / 05期

关键词：

SMALL METAL-CLUSTERS; ELECTRONIC-STRUCTURE; EXPERIMENTAL SETUP; THIN-FILMS; PHOTOEMISSION; TIO2; CATALYSTS; GROWTH; REACTIVITY; DEFECTS;

D O I：

10.1116/1.3467033

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In order to examine cluster size dependence, mass-selected platinum clusters, Pt-n (n=2-5, 7, 8, 10, 15), were deposited on TiO2(110) surfaces at room temperature under soft landing conditions, and their core levels were investigated by x-ray photoelectron spectroscopy. Pt core-level shifts with cluster size are observed. The binding energies of Pt 4f(7/2) decrease steeply with increasing cluster size up to n=7 for Pt-n and decrease gradually for n >= 8. This inflection point (n=8) agrees well with the cluster size at a geometric transition (planar-to-three-dimensional) seen with scanning tunneling microscopy (STM) [N. Isomura, X. Wu, and Y. Watanabe, J. Chem. Phys. 131, 164707 (2009)]. It was found that the core-level shifts of mass-selected Pt clusters deposited on TiO2 are closely correlated with cluster geometries determined directly by atomic-resolution STM imaging. (C) 2010 American Vacuum Society. [DOI: 10.1116/1.3467033]

引用

页码：1141 / 1144

页数：4

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