铁、氮共掺杂二氧化钛薄膜的亲水性能

采用溶胶-凝胶法制备了铁掺杂TiO2(Fe-TiO2)薄膜, 将Fe-TiO2薄膜放置氨气气氛中高温处理, 形成铁、氮共掺杂TiO2(Fe/N-TiO2)薄膜. 通过XRD、XPS、SEM、UV-Vis法进行吸收光谱分析及薄膜表面亲水接触角分析, 研究了铁、氮掺杂浓度, 热处理温度, 膜厚等因素对薄膜亲水性能的影响. 结果表明, Fe/N-TiO2(0.5%Fe, 摩尔百分数)显示出更佳的亲水性能, 在可见光下优势尤为明显. 铁掺杂主要作用是降低电子和空穴的复合几率, 氮掺杂可以增强TiO2薄膜在可见光区的吸收, 两种效应相互结合, 共同提高了薄膜在可见光下的亲水性能.

Hydrophilicity of TiO2 Thin Films Codoped with Iron and Nitrogen

TiO2 doped with iron (Fe-TiO2) thin films were synthesized using sol-gel method. TiO2 codoped with iron and nitrogen (Fe/N-TiO2) thin films were prepared by calcining Fe-TiO2 thin films in ammonia atmosphere. The influence of iron and nitrogen doping concentration, heat-treatment temperature and film thickness on the hydrophilicity of the films were studied by XRD, XPS, SEM, UV-Vis spectra and measured water contact angle. The results indicated that Fe/N-TiO2 (0.5%Fe,molar percent) films were optimumin hydrophilicity, especially under visible-light irradiation. Doping iron mostly reduced the recombination of electrons and holes, and doping nitrogen in TiO2 enhances photoresponse in visible-light region. The hydrophilicity benefited fromboth effects.