论文成果
Suppression of Photoinduced BBO Defects Generation on TiO2(110) by Water
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- 论文类型：期刊论文
- 发表时间：2013-12-01
- 发表刊物：CHINESE JOURNAL OF CHEMICAL PHYSICS
- 收录刊物：SCIE、Scopus
- 文献类型：J
- 卷号：26
- 期号：6
- 页面范围：646-650
- ISSN号：1674-0068
- 关键字：Temperature programmed desorption; Time of flight spectrum;
Photo-stimulated desorption; Oxygen vacancy
- 摘要：We have investigated creation of variable concentrations of defects on TiO2(110)-(1 x 1) surface by 266 nm laser using temperature programmed desorption technique. Oxygen-vacancy defects can be easily induced by ultraviolet light, the defects concentration has a linear dependence on power density higher than 50 mW/cm(2) for 90 s irradiation. No observation of O-2 molecule and Ti atom desorption suggests that UV induced defects creation on TiO2(110)-(1 x 1) is an effective and gentle method. With pre-dosage of thin films of water, the rate of defects creation on TiO2(110)-(1 x 1) is slower at least by two orders of magnitude than bare TiO2(110)-(1 x 1) surface. Further investigations show that water can be more easily desorbed by UV light, and thus desorption of bridging oxygen is depressed.
