Oxygen-induced morphological changes of Ag nanoclusters supported on TiO2(110)

被引：73

作者：

Lai, XF ^{[1
]}

St Clair, TP ^{[1
]}

Goodman, DW ^{[1
]}

机构：

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

来源：

FARADAY DISCUSSIONS | 1999年 / 114卷

关键词：

D O I：

10.1039/a902795e

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 effect of in situ O-2 exposure on TiO2(110)-supported Ag nanoclusters was investigated using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). An oxygen-induced cluster ripening was observed by STM after Ag/TiO2(110) was exposed to 10.00 Torr O-2 for 2 h in an elevated-pressure reactor. The Ag clusters exhibit a clear bimodal size distribution after O-2 exposure due to Ostwald ripening: some clusters increase in size while other clusters decrease in size. The cluster density also increased 5-15% after O-2 exposure, indicating redispersion simultaneously occurs with ripening. It is shown that intercluster transport is likely accomplished through the formation of Ag2O.

引用

页码：279 / 284

页数：6

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