Photochromism of peroxotungstic acid/PVP nanocomposite obtained by sol-gel method

被引：10
|
作者：
Chen, XC [1 ]
Lin, YX [1 ]
机构：
[1] Chinese Acad Sci, Key Lab Mat Phys, Inst Solid State Phys, Hefei 230031, Peoples R China
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2005年 / 36卷 / 02期
关键词：
nanocomposite; photochromism; sol-gel; peroxotungstic acid;
D O I：
10.1007/s10971-005-3611-3
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Peroxotungstic acid (PTA)/PVP composite film was prepared via sol-gel method. TEM revealed that the composite films consist of peroxotungstic acid nano-grains embedded in amorphous PVP matrix. The samples were observed to exhibit reversible photochromic effect when irradiated with solar light. The iodometric titration and FT-IR spectra indicated the presence of peroxo groups (W-O-O-W) incorporated into PTA structure. EPR measurement revealed the presence of unpaired paramagnetic electrons in PTA/PVP nanocomposite gel. The UV-Vis-Nir transmittance spectra and EPR spectroscopy of sample indicate that the photochromic behaviour is due to the photo-excitation of the unpaired electrons at W-O octahedral sites of peroxotungstic acid.
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收藏
页码：197 / 201
页数：5
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