TiO_2及其掺Fe材料的制备和EPR谱的研究  

Preparation and EPR Spectra of Titanium Dioxide and Fe-Doped Titanium Dioxide Materilals

作　　者：神干[1] 殷春浩[1] 朱姗姗[1] 李富强[1] 侯磊田[1] 

机构地区：[1]中国矿业大学理学院,江苏徐州221116

出　　处：《波谱学杂志》2011年第4期454-463,共10页Chinese Journal of Magnetic Resonance

基　　金：国家教育部留学回国人员实验室建设科研基金资助项目(2003.18);中国矿业大学优秀创新团队基金资助项目(2004ZCX012)

摘　　要：以钛酸四丁酯、无水乙醇、冰醋酸为原料,在室温下用溶胶-凝胶法制备得到二氧化钛及其掺Fe样品的湿凝胶,室温放置2天后,100℃干燥得到干凝胶,在500℃下焙烧得到二氧化钛及其掺Fe的粉末状样品.利用X射线衍射、电子顺磁共振等测试手段对样品进行分析,结果显示所得样品均为锐钛矿,Fe被引入了二氧化钛晶格中,Ti 3+氧化中心信号强度随Fe掺杂量的增加而增强,峰值向磁场减小方向小幅偏移.在不同测试温度下,含Fe量为0.1%的Fe-TiO2样品中Ti 3+氧化中心信号强度随温度升高而增强,峰值也向磁场减小方向小幅偏移.根据电子顺磁共振理论以及二氧化钛在空气中与O2的反应解释了这些现象.TiO2 and TiO2 doped with Fe were synthetized by the sol-gel method with tetrabutyl titanate,absolute ethyl and alcoholglacial acetic acid as the raw materials at room temperature.Xerogel was collected after reaction for two days under room temperature and dried at 100 ℃.TiO2 and Fe-doper powder samples were prepared by heating the xerogel at 500 ℃.The sampels were analyzed by X-ray diffraction and EPR techniques.The results showed that all samples made in this way were anatase,and Fe had been doped into the crystal lattice of TiO2.With the increase of the dose of Fe doping,the signal intensity of Ti3＋ oxidation center increased,and its peak moved towards the magnetic reducing direction.The signal intensity of Ti3＋ oxidation center in Fe-doped 0.1% of Fe-TiO2 samples also increased with temperatures,and its peak also moved towards the magnetic reducing direction.The results were explaned according to the theory of EPR and the reaction of TiO2 and O2.

关 键 词：电子顺磁共振(EPR) 二氧化钛 溶胶-凝胶法 

分 类 号：O482.53[理学—固体物理]