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Relationship Between Photocatalytic Activity and Structure of TiO2 Thin Film
Wen-zhen Zhang ,Tao Zhang ,Wen Yin ,Geng-yu Cao*
Author NameAffiliation
Wen-zhen Zhang Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Tao Zhang Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Wen Yin Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Geng-yu Cao* Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Abstract:
TiO2 thin films with different crystalline structures were prepared by the CVD method. The relationship between photocatalytic activity of a TiO2 thin film and its crystalline type was investigated. These films were characterized by XRD and AFM. Their photocatalytic properties were tested by the degradation of NO2-. The results showed that the crystalline structures of TiO2 thin films are primary anatase and/or rutile when the preparation temperatures were less than 573 K and higher than 773 K respectively. When the preparation temperature was around 623 K, the structures of TiO2 thin films were mixed crystalline structure, which showed the highest catalytic activity. When the ratio of rutile to anatase in TiO2 thin films fell between 0.5 and 0.7, the highest catalytic activity for the degradation of NO2- was found.
Key words:  CVD method, TiO2, Photocatalytic activity, Rutile, Anatase
FundProject:
二氧化钛薄膜的结构和光催化活性关系
张文真,张涛,尹文,曹更玉*
摘要:
用化学气相沉积法合成了具有不同晶体结构的二氧化钛薄膜,研究了二氧化钛薄膜的结构和光催化活性的关系.用XRD、AFM研究了薄膜的晶体组成和形貌,用亚硝酸根研究了薄膜的光催化活性.结果表明在制备温度低于573 K或高于773 K时,薄膜的结构分别为锐钛矿型或金红石型.而在上述温度之间生成的薄膜具有混合的晶型结构,特别是在623 K附近,制备的薄膜具有最高的光催化活性.进一步研究表明,当金红石与锐钛矿微晶体的比例在0.5?0.7时,催化剂薄膜具有高活性.
关键词:  化学气相沉积法,TiO2,光催化,金红石,锐钛矿
DOI:10.1360/cjcp2007.20(1).95.4
分类号: