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Crystal Structure and Photocatalytic Characteristics of Nanoscale Sb-doped TiO2 Thin Films
Da-sen Ren,Zhuang-jian Zhang
Author NameAffiliation
Da-sen Ren Department of Materials Science, Fudan University, Shanghai 200433, China; Computer Center,Guizhou University for Ethnic Minorities, Guiyang 550025, China 
Zhuang-jian Zhang Department of Materials Science, Fudan University, Shanghai 200433, China; 
Abstract:
Nanoscale Sb doped titanium dioxide thin films photocatalyst (Ti1-xSbO2) were obtained from dip-coating sol-gel method. The influence of dopant Sb density on the crystal structure and the phase transformation of the thin films were characterized by X-ray diffraction (XRD) and Raman spectra. The results of XRD showed that as-prepared films were not only in anatase state but also in brookite. The crystalline size was estimated to be around 13.3-20 nm. Raman spectra indicated there coexisted other phases and a transformation from brookite to anatase in the samples doped with 0.2% Sb. After doping a proper amount of Sb, the crystallization rate and the content of the anatase Ti1?xSbO2 in the thin films was clearly enhanced because Sb replaced part of the Ti of TiO2 in the thin films. The anode current density (photocurrent density) and the first order reaction speed constant (k) of thin films doped with 0.2% Sb reached 42.49 1A/cm2 and 0.171 h/cm2 under 254 nm UV illumination, respectively, which is about 11 times and 2 times that of the non-doped TiO2 anode prepared by the same method respectively.
Key words:  Crystal structure, XRD pattern, Raman spectra, Anatase, Dopant, Anode current density
FundProject:
Sb掺杂纳米TiO2光催化剂的晶体结构与光催化性能
任达森 ,章壮健
摘要:
用溶胶-凝胶法将纳米TiO2:Sb薄膜沉积在玻璃基板上. 通 过XRD、Raman光谱研究了Sb掺杂量对薄膜的晶体结构和晶相转 变的影响. 结果表明:纯TiO2薄膜中,TiO2不仅以无定型态存在, 而且还以板钛矿和锐钛矿的形式存在. 掺入适量的Sb后,由于Sb替 代了TiO2的部分Ti形成Sb-O-Ti结构,改变了TiO2的晶格结构,改 善了薄膜的结晶效率,使锐钛矿结构的TiO2:Sb含量明显提高. 掺 杂0.2% Sb时,薄膜的结晶效率最高. 254 nm光源照射时,掺杂0.2% Sb的电极的阳极光电流
关键词:  薄膜结构,XRD,Raman谱,锐钛矿,掺杂,光电流密度
DOI:10.1360/cjcp2006.19(6).549.6
分类号: