| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Research Abstract |
Metal oxide films (of 10 oxides) were laminated on the photocatalytically active titanium dioxide (TiO_2) thin film, and the activity of photolysis reaction was tested. These thin films were made by sol-gel method using hydrolysis and poly-condensation reaction of metal-alkoxides of them, and the activity was tested for organic compounds (salicylic acid, orange II, bisphenol A, methylene blue) in aqueous solutions. Results obtained so far are as follows ;
1. Two component lamination thin films of TiO_2-SnO_2, TiO_2-In_2O_3 are homogeneous and very transparent, and the photocatalytic activity is larger than that of TiO_2 single thin film.
2. Three component lamination thin films of In_2O_2-TiO_2-SnO_2 are also homogeneous and very transparent, and the photocatalytic activity is larger than that of TiO_2 single thin film, similarly to the two component lamination thin films.
These are supposed to be owing to ; that by laminating SnO_2 or In_2O_3 which has the lower conduction bands than TiO_2, the conduction electrons caused by TiO_2 light absorption move quickly to these bands, so the recombination of electron and positive hole is prevented ; as well as their photocatalyst surface characteristics are different.
Besides, for SnO_2/TiO_2 lamination thin film, decrease in the water droplet contact angle was observed also on the SnO_2 thin film after light irradiation, and the super hydrophilicity was observed similarly to the TiO_2 thin film.
The results obtained so far will soon be presented to academic journals.
In the future, mechanism will be examined in detail.
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