Materials Transactions Online

Materials Transactions, Vol.53 No.03 (2012) pp.463-468
© 2012 The Japan Institute of Metals

Structure and Photocatalysis of TiO2/ZnO Double-Layer Film Prepared by Pulsed Laser Deposition

Lei Zhao, Maosheng Xia, Yuhua Liu, Biju Zheng, Qing Jiang and Jianshe Lian

Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun, 130025, P. R. China

Nanocrystalline double-layer film of TiO2/ZnO was prepared by pulsed laser deposition on quartz substrate and their microstructure, optical property and photocatalysis were investigated. The first/bottom ZnO layer grew on its [001] direction of the wurtzite structure, while the second/top TiO2 layer consisted of nanorods grown on the [001] direction of its anatase structure. The TiO2/ZnO film showed improved photo-absorption in visible light in the UV-visible absorption spectrum; and showed weaken UV emission and enhanced deep level emission in the photoluminescence spectrum. By the degradation of methyl orange and methylene blue, the TiO2/ZnO film exhibited evident enhanced photo-degradation efficiency in a wide wavelength range. That can be explained by the enhanced wavelength response in visible range, more effective use of irradiation light and the retarded recombination of electron-hole pairs in the double layer films.

(Received 2011/11/08; Accepted 2011/12/14; Published 2012/02/25)

Keywords: thin films, electron microscopy, microstructure, optical properties

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