Carbon coating of anatase-type TiO2 through their precipitation in PVA aqueous solution
✍ Scribed by Michio Inagaki; Yumiko Hirose; Takafumi Matsunaga; Tomoki Tsumura; Masahiro Toyoda
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 498 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Fine particles of photocatalytic anatase-type TiO prepared through hydrolysis of titanium-tetraisopropoxide were coated 2 by carbon through their precipitation in poly(vinyl alcohol) (PVA) aqueous solution, followed by heat treatment at high temperatures of 400-1000 8C in a flow of high purity Ar. Without carbon coating, the phase transformation from anatase to rutile started above 600 8C, but it was suppressed up to 800 8C with carbon coating. Suppression of the phase transformation depended on the amount of carbon coated, apparent suppression being observed with carbon content above 5 mass%. The amount of carbon coated on anatase was controlled by changing the concentration of PVA in the solution. In order to have a carbon content of about 5 mass%, a PVA solution with more than 2 mass% had to be used.