Effect of the preparation method on the band gap of titania and platinum-titania sol-gel materials

被引：131

作者：

Sanchez, E ^{[1
]}

Lopez, T ^{[1
]}

机构：

[1] UNIV AUTONOMA METROPOLITANA IZTAPALAPA,DEPT CHEM,MEXICO CITY 0934,DF,MEXICO

来源：

MATERIALS LETTERS | 1995年 / 25卷 / 5-6期

关键词：

D O I：

10.1016/0167-577X(95)00190-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

TiO2 and Pt/TiO2 sol-gel materials were synthesized at pH 3 and 9 by the sol-gel process using titanium alkoxide as reactant. The resultant solids were studied by UV-Vis (diffuse reflectance) spectroscopy. An evaluation of the band gap (E(g)) was done in samples thermally treated at different temperatures. V-O2-(+) vacancies are formed in titania and platinum-titania samples by dehydroxylation when the samples are prepared at pH 3 and by oxygen lattice desorption if the samples are prepared at pH 9. Platinum metal acts as an electron trap.

引用

页码：271 / 275

页数：5

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