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http://dx.doi.org/10.3740/MRSK.2018.28.11.620

Enhanced Self-Cleaning Performance of Ag-F-Codoped TiO2/SiO2 Thin Films  

Kim, Byeong-Min (Department of Materials Science and Engineering, University of Seoul)
Kim, Jung-Sik (Department of Materials Science and Engineering, University of Seoul)
Publication Information
Korean Journal of Materials Research / v.28, no.11, 2018 , pp. 620-626 More about this Journal
Abstract
Highly self-cleaning thin films of $TiO_2-SiO_2$ co-doped with Ag and F are prepared by the sol-gel method. The asprepared thin films consist of bottom $SiO_2$ and top $TiO_2$ layers which are modified by doping with F, Ag and F-Ag elements. XRD analysis confirms that the prepared thin film is a crystalline anatase phase. UV-vis spectra show that the light absorption of $Ag-F-TiO_2/SiO_2$ thin films is tuned in the visible region. The self-cleaning properties of the prepared films are evaluated by a water contact angle measurement under UV light irradiation. The photocatalytic performances of the thin films are studied using methylene blue dye under both UV and visible light irradiation. The $Ag-F-TiO_2/SiO_2$ thin films exhibit higher photocatalytic activity under both UV and visible light compared with other samples of pure $TiO_2$, Ag-doped $TiO_2$, and F-doped $TiO_2$ films.
Keywords
photocatalyst; titanium dioxide; $Ag-F-TiO_2$ film; self-cleaning; sol-gel process;
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