中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 17 No. 4 August 2007 |
(Key Lab of Automobile Materials, Ministry of Education,
College of Materials Science and Engineering, Jilin University (Nanling Campus), Changchun 130025, China)
Abstract:Titanium dioxide (TiO2) films with anatase structure were prepared on quartz glass substrates by pulse laser ablating titanium (99.99%) target under oxygen pressure of 10 Pa at substrate temperature of 500−800 ℃. The structural properties of the films were characterized by X-ray diffractometry(XRD), X-ray photoelectron spectroscopy(XPS) and field emission scan electron microscopy(FESEM). The results show that, as the substrate temperature is increased from 600 ℃ to 800 ℃, the anatase structure of the films changes from random growth to (211)-oriented growth. The absorption edge tested by UV-Vis Spectrometer has a blue shift. The photocatalytic activity of the films was tested on the degradation of methyl orange. It is found that the film with random growth structure exhibits better photo-degradation efficiency than that with (211)-oriented growth structure.
Key words: TiO2 thin film; pulsed laser deposition; photocatalytic activity; orientation