【摘要】 TiO2薄膜是解决TiO2回收的有效方法,缺点是TiO2活性低,寻找合适的载体以及提高TiO2薄膜的光催化活性,是TiO2负载薄膜技术需要解决的核心问题。研究了13种离子对负载在釉面瓷砖、玻璃、陶瓷、钛片、铝片和不锈钢片6种载体上TiO2薄膜的掺杂,并从界面材料结构、双电层结构等方面讨论了离子掺杂与载体对TiO2薄膜光催化活性的影响。结果表明,TiO2薄膜的离子掺杂效果不仅和离子掺杂浓度、种类有关,而且还与载体类型有关。TiO2薄膜和非金属载体主要形成复合半导体结构,改善掺杂离子对载流子的捕获能力。金属载体与TiO2薄膜之间主要形成肖特基势垒,有利于电子与空穴的分离。载体与TiO2薄膜之间形成的界面双电层结构能改变离子捕获中心与TiO2半导体费米能级间的相对位置,从而提高或降低离子对载流子的捕获能力。更多还原

【Abstract】 The main disadvantage with TiO₂ thin film,an effective way for recovery of TiO₂ in the photocatalyst,is its low activity.The key to TiO₂ thin film catalysis is to find suitable substrates to enhance photocatalytic activity of TiO₂ thin film.Doping of 13 metal ions into TiO₂ thin film carried on 6 substrates（ceramic tile,glass,ceramic,titanium slice,aluminum slice and stainless steel slice） were studied,and influences of the doping on photocatalytic activity of TiO₂ thin film were discussed from interface structure and double electronic layer between substrate and TiO₂ thin film.The results showed that effects of ion doping were dependent upon not only the ion dopant and its concentration,but also the types of substrates.Composite semiconductor structure formed between TiO₂ thin film and nonmetal substrate,which enhanced the carrier trap capability of metal ion dopants.Schottky barrier formed between metal substrate and TiO₂ thin film favored separation of photogenerated-electrons and photogeneratedvacancies.Double electronic layer structure between substrates and TiO₂ thin film changed the relative position between trap position of metal ions and Femi level of TiO₂ semiconductor,accordingly lowered or enhanced the trapping capability of metal ion to carriers.更多还原