Influence of TiCl4 treatment on surface defect photoluminescence in pure and mixed-phase nanocrystalline TiO2

被引：118

作者：

Knorr, Fritz J. ^{[1
]}

Zhang, Dongshe ^{[1
]}

McHale, Jeanne L. ^{[1
]}

机构：

[1] Washington State Univ, Dept Chem, Pullman, WA 99164 USA

来源：

LANGMUIR | 2007年 / 23卷 / 17期

关键词：

D O I：

10.1021/la700274k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Room-temperature UV-excited photoluminescence spectra are reported for nanocrystalline films of anatase, rutile, and mixed-phase TiO2 (Degussa P25) before and after treatment with TiCl4 solution. The surface defect luminescence of anatase in the visible region is suppressed by TiCl4 treatment, indicating a decrease in surface traps. A similar anatase surface-defect emission is observed in the mixed-phase nanciparticles but is completely quenched following TiCl4 treatment and replaced by emission characteristic of rutile. Our results suggest that TiCl4 treatment of mixed-phase TiO2 may result in a surface layer of rutile and that radiative recombination of electron-hole pairs formed in the bulk anatase region of nanocrystallites occurs after electrons migrate to newly formed rutile surfaces.

引用

页码：8686 / 8690

页数：5

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