The influence of surface topography on the photocatalytic activity of electrophoretically deposited titanium dioxide thin films |
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| Authors: | Alicia Guek Geok Toh Ruxiong Cai David Lee Butler |
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| Affiliation: | 1. School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore;2. Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075 Singapore, Singapore;1. V. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences (NAS) of Ukraine, 41 Pr. Nauky, 03028 Kyiv, Ukraine;2. Instituto Politécnico Nacional—ESFM, Av. IPN, Ed.9 U.P.A.L.M., 07738 Mexico D.F., Mexico;3. L. Pysarzhevsky Institute of Physical Chemistry of NAS of Ukraine, 31 Pr. Nauky, 03028 Kyiv, Ukraine;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, CAS, Fuzhou, Fujian 350002, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;1. Univ. Grenoble Alpes, F-38000 Grenoble, France;2. CEA, LETI, MINATEC Campus, 17 rue des Martyrs, F-38054 Grenoble, France;3. CEA, INES, 50 avenue du Lac Léman, F-73377 Le-Bourget-du-Lac, France |
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| Abstract: | Recently, titanium dioxide thin film coatings have received considerable attention due to their wide self-cleaning abilities with applications ranging from photocatalytic building cladding to vehicle anti-fogging mirrors. Traditionally, the photocatalytic coatings are deposited by dip, spin, spray and CVD methods which are suitable for flat substrates. For irregular conductive surfaces electrochemical means such as electrophoretic deposition (EPD) can be used. In this paper, we present the use of an EPD route to alter the surface morphology of nanocrystalline TiO2 thin films. By modifying the initial particle sizes within the colloidal suspensions used during EPD, it was possible to produce particulate coatings with differing grains sizes and surface roughness. The influence of the surface topography on the photocatalytic activity of the film was investigated through ATR-FTIR analysis of the decomposition of stearic acid under ultraviolet irradiation. It was determined that surface topography such as grain size and roughness had a key impact in the film photocatalytic properties. |
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