摘要
通过溶胶 -凝胶方法分别在ITO和玻璃表面制备了纳米TiO2 薄膜 ,研究了纳米TiO2 薄膜在 2 5 4及 3 65nm的紫外光照射下的循环伏安行为和光致超亲水性 .在紫外光的照射下 ,TiO2 薄膜电极可表现出两个光电化学过程 ,纳米TiO2 薄膜的光致超亲水性转变及两个光电化学过程的速率均取决于紫外光的波长 ,原因在于纳米TiO2 薄膜对两种波长的光的吸收率和光子的能量不同 .提出了光电化学过程的机理 ,认为紫外光照射下纳米TiO2 薄膜的超亲水性变化与产生Ti3 +
TiO2 thin films were prepared by a sol-gel method on ITO and glass substrates. The hydrophilicity change under two wavelength UV light was investigated by the determination of the contact angle of water. Cyclic voltammetric behavior of ITO/TiO2 electrode under ultraviolet (UV) illumination with different wavelength was measured in the solution of Na2SO4. Two photoelectrochemical processes for TiO2 thin film electrode under UV illumination can be observed. The conversion rates of hydrophilicity of the TiO2 thin film and the two photoelectrochemical processes were determined by the wavelength of the UV light. The main reason is that ultraviolet light with short wavelength has high energy and absorbance. A mechanism was proposed on the base of these two photoelectrochemical processes. It is assumed that the change of hydrophilicity of the films was related with the changes of surface structure when the film was irradiated by UV light.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2003年第11期1872-1876,共5页
Acta Chimica Sinica
基金
国家自然科学基金 (Nos.2 0 0 730 1 1
2 0 2 730 1 8)
上海市分子催化和功能材料重点实验室资助项目
