COLL 188 |
| Titanium dioxide (TiO2) is one of the most important semiconductor film for photocatalytic reactions due to its strong oxidizing power, high photostability and redox selectivity. In this work, nanocrystalline TiO2 thin films were deposited onto glass substrates from TiO2 sols which was prepared from precursor, titanium (IV) n-butoxide, in the presence of acetic acid (CH3COOH), by a simple one pot experiment under the hydrothermal conditions. The glass substrate were dip-coated or spin-coated and annealed at 550 ¢XC to result the TiO2 films. Depending on the coating condition, the TiO2 film thickness varied from 0.06 to 0.3 ƒÝm. The morphology of the TiO2 films was examined by scanning tunneling microscopy. The grain size of TiO2 particulates is ~ 30-50 nm. The X-ray diffraction pattern for the annealed TiO2 powders (no dipping and coating) indicated the formation of all anatase phase TiO2. To examine the photocatalytic activity of the as-prepared TiO2 films, the photodegradation of methylene blue was carried out. The possible correlation between the photocatalytic activity and the TiO2 preparation conditions is discussed. |
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Fundamental Research in Colloid and Surface Chemistry
6:00 PM-8:00 PM, Monday, August 20, 2007 BCEC -- East Registration, Poster
Division of Colloid & Surface Chemistry |