以氟化铵为氟源,采用水热法制得氟掺杂TiO_2(FTO)溶胶,并通过浸渍提拉法在低温下制备了FTO薄膜.其中在120℃下水热处理10h所得的TiO_2溶胶制备的薄膜均匀透明,具有较高的光催化活性.氟掺杂后的TiO_2晶粒尺寸并未发生明显变化,但薄膜的光催化活性显著升高.F/Ti摩尔比为0.01时,FTO薄膜的光催化活性最高,比TiO_2薄膜的活性升高了23%.X射线光电子能谱结果表明,氟掺杂TiO_2中的氟离子存在晶格取代掺杂和表面化学吸附两种形式.这两种氟离子的共同作用是FTO薄膜光催化活性升高的主要原因.
F-doped TiO_2 (FTO) sol was prepared using NH4F as the fluorine precursor by a hydrothermal method. FTO thin film was then prepared via dip-coating. The TiO_2 thin film prepared from the TiO_2 sol that was hydrotherrnally treated at 120 ℃ for 10 h had preferable transparence and high photocatalytic activity. F doping did not significantly change the grain size of TiO_2 but greatly enhanced the photo-catalytic activity of the TiO_2 film. The optimal doping concentration of F corresponded to F/Ti molar ratio of 0.01. The photocatalytic activ-ity of the FTO thin film was 23% higher than that of TiO_2 thin film. X-ray photoelectron spectroscopy results showed that there were two forms of F element in the FTO thin film: surface chemically adsorbed F and substituent lattice F. Both surface adsorbed F and substituent lattice F played a role in the photocatalytic activity enhancement of the FTO thin film.
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