机构地区: 海南师范大学化学与化工学院
出 处: 《海南师范大学学报(自然科学版)》 2009年第4期418-424,共7页
摘 要: 分别用硝酸铁溶液浸渍法和反胶束溶胶制备法中添加硝酸铁的掺铁方式,制备铁元素掺杂TiO2(Fe-TiO2)纳米薄膜.对Fe元素掺杂二氧化钛纳米薄膜和未掺铁二氧化钛薄膜的紫外可见光谱进行研究,发现硝酸铁浸渍法制备的掺铁二氧化钛薄膜吸收光谱发生红移,在可见光区表现出一定的光学活性,而反胶束制备过程中掺杂的二氧化钛薄膜吸收光谱发生蓝移.膜的半导体禁带宽研究表明,与纯二氧化钛薄膜相比,浸渍法制备的膜禁带宽变小了,而反胶束制备过程中掺杂的二氧化钛薄膜其禁带宽变大了,表明不同的掺方式对膜的电子结构产生了不同的影响,从而影响了膜的光催化反应活性. Fe doped titanium dioxide thin films were made by using two different methods, (a) dipping the TiO2 films in nitric acid iron solution and (b) adding nitric acid iron to the TiO2 reverse micelles during the preparation of nano- TiO2 film. By analyzing the UV spectrum of the TiO2 thin films and Fe doped TiO2 thin films, we found that the UV spectrum of Fe doped TiO2 thin films by method (a) is red shift but the UV spectrum of Fe doped TiO2 thin films by method (b) is blue shift. The result also present that the bandgap of Fe doped TiO2 thin films by method (a) is narrow and bandgap of Fe doped TiO2 thin films by method (b) is wider. It may be due to different effect on electronic structure of TiO2 films by different doping method.