掺氮光敏化纳米晶TiO_2的研制

Photosensitizing Nano-Crystalline Titania by Doping Nitrogen

以四氯化钛、氨气或氨水为原料,醇为溶剂制备了掺杂氮的可见光敏化纳米晶TiO2,通过紫外可见吸收光谱验证了它具有良好的可见光吸收性能,吸收阈值最大可以达到830nm。XRD分析表明这种方法制备的TiO2为纳米金红石型或锐钛矿与金红石的混晶,制得的样品经350℃热处理后比文献报道的在600℃处理的TiO2具有更好的可见光吸收。通过TG-DTA曲线、FT-IR、紫外-可见光谱图分析了氮的掺杂过程,指出前躯体中氮的存在形式以及氧化钛晶格中掺杂氮的存在状态对氧化钛的可见光敏化有重要影响。

Nitrogen-doped nano-crystalline titania was prepared by the reaction of titanic chloride and ammonia gas or ammonia water using methonal or isopropanol as solvent. Excellent visible light absorption was detected by the UV-Vis spectrophotometer. The absorption threshold value was transferred to 830 nm. Because the nitrogen element was introduced in the precursor of TiO2, the stronger visible light absorption was obtained at a low calcining temperature 350°C comparing to the ammonia gas treating method at 600°C reported in the literature. The state of nitrogen existing in the precursor and in the TiO2 lattice exerted important influence on the result of visible light sensitization.