Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-12-01

Journal: CHINESE JOURNAL OF CHEMICAL PHYSICS

Included Journals: Scopus、SCIE

Volume: 26

Issue: 6

Page Number: 646-650

ISSN: 1674-0068

Key Words: Temperature programmed desorption; Time of flight spectrum; Photo-stimulated desorption; Oxygen vacancy

Abstract: 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.