期刊
SURFACE SCIENCE
卷 532, 期 -, 页码 456-460出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(03)00154-7
关键词
titanium oxide; polycrystalline thin films; surface electronic phenomena (work function; surface potential, surface states, etc.); surface photovoltage; chemisorption; interface states
Nanocrystalline TiO2 films used for gas sensors have been studied by means of surface photovoltage spectroscopy and other analytical tools to investigate the oxygen chemisorption effect on the electrical properties of the films. The results show that the surface (and intergranular interface) band bending increases with oxygen exposure due to electron trapping at midgap states induced by chemisorption. The surface electronic structure is revealed by. the measurements, allowing determination of the sensing mechanism of these important films. In addition, a photoinduced chemisorption of oxygen at room temperature is observed. This has important implications for low-temperature g as sensors. (C) 2003 Elsevier Science B.V. All rights reserved.
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