掺杂锡离子对纳米二氧化钛薄膜光催化性能的影响  

Effect of Sn^(4+) dopant on photocatalytic performances of nanocrystalline titanium dioxide thin films

作　　者：邸云萍[1] 徐利华[1] 张文丽[2] 张菡[1] 程科[1] 

机构地区：[1]北京科技大学无机非金属材料系,北京100083 [2]河北理工大学,河北唐山063009

出　　处：《云南大学学报（自然科学版）》2005年第S3期452-456,492,共6页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(50332010;50172008);国家科技攻关资助项目(2003BA612-18)

摘　　要：采用溶胶-凝胶法在玻璃上制备了透明锐钛矿型纳米TiO2薄膜和金属锡离子掺杂的锐钛矿与金红石混晶型纳米TiO2薄膜,并利用X射线衍射(XRD)、原子力显微镜(AFM)、紫外-可见分光光度计对合成的薄膜进行表征.研究了掺杂锡离子对TiO2薄膜吸收光谱及光催化活性的影响,结果表明:掺杂锡离子使得TiO2薄膜对入射光的吸收带边发生红移;适量掺杂锡离子能够显著地提高TiO2薄膜的光催化活性.并探讨了镀膜层数对薄膜光催化活性的影响,发现对于掺杂不同浓度锡离子的TiO2薄膜均有其对应的最佳膜层数.The uniform and transparent nanocrystalline thin film photocatalysts of pure and Sn^(4+) doped titanium dioxide were prepared via sol-gel dip-coating process on the glass substrates.The thin films were characterized by X-ray diffraction(XRD),atomic force microscopy(AFM) and ultraviolet-visible(UV-VIS) spectrophotometer.It was noted that pure titanium dioxide thin film only had anatase structure,but Sn^(4+) doped ones had a coexistence of anatase and rutile.The effects of different amount of Sn^(4+) dopant on absorption spectra and photocatalytic activity of TiO_2 thin films were studied.It was showed that doping Sn^(4+) caused the red movement of the optical absorption edge for the incoming light,and the doping of Sn^(4+) could greatly improve the photocatalytic activity of titanium dioxide thin films.Besides,the effect of the number of layers on photocatalytic performance was discussed.It was founded that the different concentrations of Sn^(4+) doped TiO_2 thin films had the optimal layer number,respectively.

关 键 词：纳米TIO2薄膜 掺杂锡离子 光吸收 光催化活性 

分 类 号：TB383.1[一般工业技术—材料科学与工程]