扫描隧道显微镜
氧化物
分子
氧气
化学物理
空位缺陷
金红石
材料科学
离解(化学)
量子隧道
纳米技术
解吸
氧原子
金属
结晶学
化学
光化学
吸附
物理化学
光电子学
冶金
有机化学
作者
Oier Bikondoa,Chi L. Pang,R. Ithnin,Christopher A. Muryn,Hiroshi Ōnishi,G. Thornton
出处
期刊:Nature Materials
[Springer Nature]
日期:2006-02-19
卷期号:5 (3): 189-192
被引量:576
摘要
The chemistry of metal oxide surfaces has long been thought to be dominated by reactions involving defects1,2. These are minority sites such as oxygen vacancies. Thus far, it has proved difficult to obtain direct experimental evidence to support this idea, although some progress has been made3,4,5. Here, we use the scanning tunnelling microscope (STM) to image the reaction of water molecules with bridging-oxygen vacancies on a model oxide surface, rutile TiO2(110). In a form of single-molecule chemistry, individual oxygen vacancies are observed being transformed into OH species as a water molecule dissociates in the vacancy. We use the STM tip to selectively desorb individual H atoms, whilst leaving the vacancies intact. This allows us to distinguish between vacancies and OH, which have a similar appearance in STM. In a very clear way, these results validate the view that defects can play a key role in oxide surface reactions.
科研通智能强力驱动
Strongly Powered by AbleSci AI