物理化学学报2012，Vol.28Issue(7)：1764-1770,7.DOI:10.3866/PKU.WHXB201205112
聚乙二醇对TiO2薄膜光致亲水性的促进作用
Promoted Effect of Polyethylene Glycol on the Photo-Induced Hydrophilicity of TiO2 Films
摘要
Abstract
To investigate the photo-induced hydrophilicity of TiO2 films and its durability, a series of TiO2 films containing polyethylene glycol (PEG) 2000 with different contents are prepared. The photo-induced hydrophilicity of the films is investigated by recording the water-droplet contact angle on the films' surface under UV irradiation, and the hydrophilicity durability is monitored under dark storage conditions. The photo-induced hydrophilicity of TiO2 films and its hydrophilicity durability are enhanced by introducing 2.0% (w) of PEG into the TiO2 sol. From Fourier transform infrared (FTIR) spectra and ultraviolet-visible diffuse reflection spectra (UV-Vis DRS), we infer that PEG acts as an electron donor to scavenge the photo-generated holes in TiO2 and promotes the formation of Ti3+ sites, which are induced by the TV4+ sites accepting the photo-generated electrons of TiO2. This promotes the formation of hydrophilic sites (the surface hydroxyl species). Compared with the pure TiO2 film, the Ti3+ sites in the Ti O2/PEG films are more stable, which prolongs the hydrophilicity of TiO2 films under dark conditions. This study is significant for the application of TiO2 as a self-cleaning material, and is also a facile approach to investigate the transient behaviors of TiO2 under UV irradiation.关键词
光致亲水性/亲水持久性/空穴捕获剂/TiO2薄膜/Ti3+物种/聚乙二醇Key words
Photo-induced hydrophilicity/ Durability of hydrophilicity/ Hole scavenger/ TiO2 film/ TP3+ species/ Polyethylene glycol分类
化学化工引用本文复制引用
郑华荣,王晓韡,林霞晖,耿强,陈旬,戴文新,王绪绪..聚乙二醇对TiO2薄膜光致亲水性的促进作用[J].物理化学学报,2012,28(7):1764-1770,7.基金项目
国家自然科学基金(21073037)和国家重点基础研究发展规划项目(973) (2010CB234604)资助 （21073037）
