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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (11): 1872-1876. 上一篇    下一篇

研究论文

不同波长紫外光照下纳米TiO2薄膜的光致亲水性与循环伏安行为

崔晓莉;沃松涛;任达森;沈杰;杨锡良;章壮健   

  1. 复旦大学材料科学系
  • 发布日期:2003-11-15

Photo-induced Hydrophilicity and Cyclic Voltammetric Behavior of TiO_2 Thin Film under Ultraviolet Illumination with Different Wavelengths

Cui Xiaoli;Wo Songtao;Ren Dasen;Shen Jie;Yang Xiliang;Zhang Zhuangjian   

  1. Department of Material Science, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University
  • Published:2003-11-15

PDF

769

被引次数

59 | 8

通过溶胶-凝胶方法分别在ITO和玻璃表面制备了纳米TiO_2薄膜，研究了纳米 TiO_2薄膜在254及365nm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，TiO_2薄膜电极可表现出两个光电化学过程，纳米TiO_2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 TiO_2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TiO_2薄膜的超亲水性变化与产生Ti~(3+)的过程引起的 表面微观结构变化存在的一定的内在联系。

关键词: 氧化钛, 薄膜, 循环伏安法, 亲水性, 微观结构

TiO_2 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/TiOj electrode under ultraviolet (UV) illumination with different wavelength was measured in the solution of Na2SO4. Two photoelectrochemical processes for TiO2 thin firm 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 stmcture when the film was irradiated by UV light.

Key words: TITANIUM OXIDE, THIN FILMS, CYCLOVOLTAMGRAPH, HYDROPHILICITY, MICRO-STRUCTURE

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