氮掺杂二氧化钛薄膜的制备与光催化性能

采用溶胶-凝胶法制备了氮掺杂改性的TiO2薄膜,用表面形貌仪、扫描电镜和光电子能谱仪等分析薄膜的厚度、表面形貌和成分,研究了薄膜对亚甲基蓝的光催化降解速率.结果表明,通过加入尿素实现了氮离子在TiO2晶格间的间隙掺杂和替位掺杂.薄膜厚度在50～200 nm之间,表面平整.氮离子掺杂使TiO2薄膜的光催化活性大大提高,当氮掺杂TiO2薄膜中N/Ti原子比为0.015时,单层氮掺杂TiO2薄膜降解亚甲基蓝一半所需要的时间为2.5 h.

Preparation and Photocatalysis Property of N-Doped TiO2 Film

Nitrogen-doped modified TiO2 films were prepared through sol-gel method. The thickness, surface microstructure and composition were analyzed by nano indenter, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of N-doped TiO2 films was researched through the degradation experiment of methylene blue under UV light. Results showed that nitrogen ions are doped into TiO2 films by adding urea and they are between TiO2 crystal lattices and mainly in interstitial configuration and substitution configuration. The films are very flat with the thickness of between 50-200 nm. Nitrogen ions doping improves the photocatalytic activity of TiO2 films. When N/Ti=0.015 (atom ratio) in TiO2 films, it takes single N-doped TiO2 film 2.5 h to decompose the methylene blue solution.