Photosensitization of TiO2 colloid by hypocrellin B in ethanol

被引：23

作者：

Wu, T ^{[1
]}

Xu, SJ ^{[1
]}

Shen, JQ ^{[1
]}

Chen, S ^{[1
]}

Zhang, MH ^{[1
]}

Shen, T ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2000年 / 137卷 / 2-3期

基金：

中国国家自然科学基金;

关键词：

TiO2; colloid; hypocrellin B; photoinduced electron transfer; excited singlet and triplet states; rate constant; EPR spectra;

D O I：

10.1016/S1010-6030(00)00366-X

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：

Hypocrellin B (HB), a natural pigment, when adsorbed on colloidal TiO2 can participate in the sensitization process by injecting electrons from its excited singlet and triplet states into the conduction band of the semiconductor. Upon excitation in its absorption band, 80% of the fluorescence emission of HB could be quenched by colloidal TiO2. Lifetime measurements and time-resolved absorption spectra gave the rate constant for the electron injection process from the excited singlet and triplet states of HE into the conduction band of the semiconductor as 6 x 10(8) and 1.3 x 10(6) s(-1), respectively. Analysis of the electron paramagnetic resonance spectra confirmed the generation of the cation radical of HE. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：191 / 196

页数：6

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