催化活性的影響
(1. 中國科學(xué)院 廣州能源研究所， 廣州 510070；
2. 廣東省生態(tài)環(huán)境與土壤研究所， 廣州 510650)
摘 要: 采用磁控濺射技術(shù)在浸漬提拉法制得的TiO2薄膜上濺射WO3層， 通過不同制備工藝控制W在TiO2晶體中的分布。 UV-VIS透射光譜表明, 在可見光范圍內(nèi)濺射有WO3層的薄膜有不同程度的吸收光譜紅移現(xiàn)象。并理論計(jì)算出帶隙能， 濺射WO3層使薄膜的帶隙能變小。 甲基橙光催化降解實(shí)驗(yàn)表明， 以焙燒—濺射—熱處理5h工藝制備的WO3/TiO2薄膜可見光活性最佳， W從薄膜表面到內(nèi)層的濃度遞減分布。 討論了不同制備工藝引起的W在薄膜內(nèi)部的不同分布對光催化活性的影響。
關(guān)鍵字: 薄膜; 可見光催化活性; 二氧化鈦;磁控濺射; 氧化鎢
LIANG Yuan-yuan1
（1. Guangzhou Institute of Energy Conversion, Chinese Academy of Science,Guangzhou 510070, China;
2. Guangdong Institute of Eco-Environment and Soil Science,
Guangzhou 510650, China）
Abstract:The TiO2 thin films from dip-coating system were magnetron-sputtered with WO3, in which different tungsten distribution was controlled by different preparation process. On the basis of UV-VIS transmissive spectra, the sputtered films have absorption peaks toward longer wavelength, and the calculation illustrates the lower optical band gap. The photo-oxidation of orange methyl proves that the process of baking—magnetron sputtering—heat treatment for 5h produces WO3/TiO2 film with best visible-light activity. The distribution of tungsten across the film section is decreased from surface to bottom. The effect of tungsten distribution on the photocatalytic activity was discussed.
Key words: film; photocatalytic activity under visible-light; titanium dioxide; magnetron sputtering; tungsten oxide
