Dynamic visualization of a metal-oxide-surface/gas-phase reaction: Time-resolved observation by scanning tunneling microscopy at 800 K

被引：234

作者：

Onishi, H

Iwasawa, Y

机构：

[1] Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo, 113, Hongo, Bunkyo-ku

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.76.791

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A surface/gas-phase reaction on TiO2(110) was visualized in situ by scanning tunneling microscopy. When a vacuum annealed (1 x 1) surface heated at 800 K was exposed to an O-2 ambient of 1 x 10(-5) Pa, hill-like structures were randomly nucleated over terraces. Then they were transformed into new terraces, with added rows comprising double strands. We proposed a reoxidation scheme to interpret the dynamics; partially reduced Ti-n+ ions (n less than or equal to 3), which had been accumulated at interstitial positions in the vacuum annealed crystal, were oxidized at the surface to form the hills, added rows, and new terraces.

引用

页码：791 / 794

页数：4

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