A mechanism for enhanced photocatalytic activity of nano-size silver particle modified titanium dioxide thin films

作     者：MENG FanMing LU Fei SUN ZhaoQi LüJianGuo 

作者机构：School of Physics and Materials ScienceAnhui UniversityHefei 230039China Key Laboratory of Materials Modification by LaserIon and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024China Anhui Key Laboratory of Information Materials and DevicesAnhui UniversityHefei 230039China Department of Physics and Electronic EngineeringHefei Normal UniversityHefei 230061China 

出 版 物：《Science China(Technological Sciences)》 (中国科学(技术科学英文版))

年 卷 期：2010年第53卷第11期

页      面：3027-3032页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant No 50872001) the Scientific Research Foundation of Edu-cation Commission of Anhui Province of China (Grant Nos KJ2009A006Z and KJ2007B132) the Doctor Scientific Research Starting Foundation of Anhui University of China, and the Foundation of Construction of Quality Project of Anhui University of China (Grant No XJ200907) 

主　　题：silver nanoparticle TiO2 thin film photocatalytic activity RF magnetron sputtering methyl orange 

摘      要：Ag-TiO2 nanostructured thin films with silver volume fraction of 0–20% were deposited on silicon and quartz substrates by RF magnetron sputtering and annealed in ambient air at 950°C for 1 h. The phase structure and surface topography of the films were characterized by X-ray diffractometer and transmission electron microscope. Photocatalytic activity of the films was evaluated by light induced degradation of methyl orange (C14H14N3NaO3S) solution using a high pressure mercury lamp as lamp-house. The relation of photocatalytic activity and silver content was studied in detail. It was found that silver content influences phase structure of TiO2 thin films, and silver in the films is metallic Ag (Ag0). With increasing silver content from 0 to 20 vol%, photocatalytic activity of the films increases first and then decreases. A suitable amount (2.5–5 vol%) silver addition can significantly enhance the photocatalytic activity of TiO2 films. The enhanced photocatalytic activity was mainly attributed to the extension of visible light absorption region of the films, the presence of anatase phase, the increase of oxy-gen anion radicals O2? and reactive center of surface Ti3+, and the better separation between electrons and holes on the films surface.