氮掺杂TiO_2薄膜的溶胶凝胶法制备及其光催化性能和亲水性的影响研究

The preparation of TiO_(2-x)N_x(0<x<1) thin films by sol-gel method and its photocatalysis and hydrophilic properties

应用溶胶凝胶方法制备了TiO2薄膜,对其在氨气气氛下热处理,通过EDS表征,成功将氮掺入薄膜中,制得了TiO2-xNx(0<x<1)薄膜。在制备TiO2薄膜过程中,选用180、400、500℃3种不同的干燥温度,在每种干燥温度条件下对薄膜进行氨气气氛下热处理,热处理温度选用400、500、600℃3种。为比较薄膜样品对可见光的利用率,将卤灯光源450nm以下的光滤掉,对薄膜进行光催化降解实验,得到TiO2薄膜的光催化效率是随着氮的掺入量的增加而呈现出先增加再减少的趋势。并发现经过500℃干燥,氨气气氛下热处理温度为600℃的条件下制得的薄膜光催化性能最优,薄膜对甲基橙的降解率可达4.3%,此时掺入的N不是以取代O的位置形式存在,且紫外光照射后薄膜的接触角达到0°,表现为超亲水性。

TiO2-xNx（O〈x〈1） thin films are fabricated in NH3 atmosphere via TiO2 annealing which is prepared by sol-gel method. The TiO2 thin films were prepared at 180,400 and 500℃ ,and then annealed in NH3 atmosphere at 400,500 and 600℃ separately. In order to evaluate the utilization ratio of the TiO2-xNx thin films, the photocatalysed degradation of the samples by filtering the visible light that wavelength less than 450nm. With the increasing concentration of N,the photocatalysis efficiency of the samples increases firstly and then decreases. It was found that the optimal photocatalysed properties were obtained by presimtering at 500℃ and annealing at 600℃ in NH3 while the degradation rate is 4.3 percent, and shown as ultra-hydrophilic material in which O is not replace with N and angle of contact is O.