掺杂钒和硅对TiO2薄膜超亲水性的影响

0引言 TiO2薄膜是众多氧化物半导体薄膜中研究最为广泛的一种材料．其表面的超亲水性和表面自清洁效应开辟了光催化薄膜功能材料的新的研究领域，已成为众多研究者研究的对象。但是如果薄膜仅由TiO2组成，当光照停止，水在TiO2薄膜表面的润湿角逐渐升高．并恢复原始状态。TiO2的禁带较宽，普通光线如太阳光等都不能将其激发．限制了其实际应用。因此如何使TiO2材料的光谱响应范围由紫外光反扩展到可见．光区一日如何更长时间地保持薄膜良好的亲水性是目前研究的重点。

Effect of Vanadium and Sillicon Dopant on Super-hydrophilicity of TiO2 Thin Films

V₂O₅-TiO₂, SiO₂-TiO₂ , SiO₂-V2O5-TiO₂ composite nanometer thin film and TiO₂ single thin film on glass substrates were prepared by sol-gel method and dip-coating technique, respectively. The films were characterized by X-ray diffraction (XRD), high-resolution scanning electron microscopy (HRSEM). The hydrophilicity of the films was determined by water contact angles on the films. The results show that the addition of V₂O₅ to TiO₂ thin films could keep good hydrophilicity under sunlight on the TiO₂ thin films and make surface morphology of thin films dense and crystalline size decrease. The addition of SiO₂ could suppress crystal growth of TiO₂ crystal and improve super-hydrophilicity of TiO₂ thin films. The contact angle in SiO₂-V₂O₅-TiO₂ thin composite films declined with the increase in V₂O₅ content, declined firstly and then increased with SiO₂ content. The dopant of V₂O₅ on TiO₂ thin films could produce a visible-light response to the films, but the addition of SiO₂ could not do much help in improving the hydrophilicity.