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Journal of Nanomaterials
Volume 2012, Article ID 310514, 7 pages
Research Article

Influence of Annealing and UV Irradiation on Hydrophilicity of Ag- T i O 𝟐 Nanostructured Thin Films

1School of Physics and Materials Science, Anhui University, Hefei 230039, China
2Anhui Key Laboratory of Information Materials and Devices, Anhui University, Hefei 230039, China
3Key Laboratory of Materials Surface Modification by Laser, Ion, and Electronic Beams, Dalian University of Technology, Ministry of Education, Dalian 116024, China

Received 3 June 2012; Revised 20 July 2012; Accepted 22 July 2012

Academic Editor: Huogen Yu

Copyright © 2012 Fanming Meng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Ag-TiO2 nanostructured thin films with silver content of 5 vol% have been deposited on silicon, glass, and quartz substrates by RF magnetron sputtering and annealed in ambient air at 900°C for 15, 30, 60, 90, and 120 min. Their crystal structure, surface morphology, and hydrophilicity have been characterized by X-ray diffractometer, atomic force microscope, and water contact angle apparatus, respectively. The influence of annealing time and UV irradiation time on hydrophilic property of Ag-TiO2 thin films have been studied in detail. It is shown that annealing time influences crystal structure of Ag-TiO2 thin films. The unannealed film is amorphous and shows poor hydrophilicity. With the increase of annealing time from 15 to 120 min, the grain-size slowly increases and tends to uniformity. A suitable annealing time can significantly enhance the hydrophilic behavior of Ag-TiO2 films. Water contact angle decreases with the increase of irradiation time. The mechanism of hydrophilicity has been proposed and can be attributed to the increase of oxygen anion radicals O 2 βˆ’ and reactive center of surface T i 3 + .