Photochromism and size effect of WO3 and WO3-TiO2 aqueous sol

被引：165

作者：

He, YP ^{[1
]}

Wu, ZY ^{[1
]}

Fu, LM ^{[1
]}

Li, CR ^{[1
]}

Miao, YM ^{[1
]}

Cao, L ^{[1
]}

Fan, HM ^{[1
]}

Zou, BS ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Nanoscale Phys & Device Lab, Beijing 100080, Peoples R China

来源：

CHEMISTRY OF MATERIALS | 2003年 / 15卷 / 21期

关键词：

D O I：

10.1021/cm034116g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The chromism of tungsten oxides has been investigated for a long time because of its academic and application importance. In this article the photochromism and its dynamics for a WO3 aqueous sol and WO3-TiO2 mixed sols are studied in detail. The chromic performance of the WO3 aqueous sol is improved significantly by adding TiO2 aqueous sol, and shows a clear size effect. The intrinsic absorption peak at around 777 run from W5+ in WO3 nanocluster, which generally appears at around 1000 nm in a WO3 film, shifts with cluster size because of the quantum confinement effect of delocalized carriers in WO3 nanoclusters. Besides the 777 nm band from W5+ in WO3, a new extrinsic 640 nm band, due to the transient formation of WOClx species in a WO3 sol in the presence of Cl- and TiO2 nanoclusters, appears after adding TiO2 sol. These results are helpful to the understanding of the chromism of tungsten oxides.

引用

页码：4039 / 4045

页数：7

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