Imaging gold clusters on TiO2(110) at elevated pressures and temperatures

被引：68

作者：

Kolmakov, A ^{[1
]}

Goodman, DW ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA

来源：

CATALYSIS LETTERS | 2000年 / 70卷 / 3-4期

关键词：

scanning tunneling microscopy; elevated pressures and temperatures; TiO2; Au clusters; catalysts;

D O I：

10.1023/A:1018872931114

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：

Variable temperature scanning tunneling microscopy (STM) has been used to image oxide-supported nanoclusters of Au at temperatures from 300 to 450 K and oxygen pressures from 10(-10) to 4 Torr. Oxygen-induced morphological changes of the TiO2(1 x 2) reconstruction are apparent at room temperature and prolonged exposure (similar to3 x 10(3) L (langmuir)) at 10(-4) Torr oxygen. Gold clusters with diameters smaller than similar to4 nm are unstable toward sintering at ca. 450 K and oxygen pressures >10(-1) Torr. Oxygen at pressures >10(-4) Torr weakens the interaction between the gold cluster and the titania support. Increasing the sample temperature to >300 K facilitates disruption of the duster-support interaction.

引用

页码：93 / 97

页数：5

共 17 条

[1] A scanning tunneling microscopy study of electrostatic and proximity effects in tip-assisted migration and desorption of a DNA base molecule on SrTiO3 [J].