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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

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.