ELECTRICAL AND OPTICAL-PROPERTIES OF POROUS NANOCRYSTALLINE TIO2 FILMS

被引：181
作者：
CAO, F
OSKAM, G
SEARSON, PC
STIPKALA, JM
HEIMER, TA
FARZAD, F
MEYER, GJ
机构：
[1] JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218
[2] JOHNS HOPKINS UNIV,DEPT CHEM,BALTIMORE,MD 21218
来源：
JOURNAL OF PHYSICAL CHEMISTRY | 1995年 / 99卷 / 31期
关键词：
D O I：
10.1021/j100031a027
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 optical and electrochemical properties of nanocrystalline TiO2 electrodes in acidic aqueous solution are reported. Cyclic voltammetry, UV/vis/NIR attenuance, EPR, photocurrent spectroscopy, and electrochemical impedance measurements are presented. At negative applied potentials the TiO2 films turn black, and an EPR spectrum appears which we attribute to Ti(III) species. The results are described in terms of a model in which the reduction of TiO2 leads to band edge unpinning.
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页码：11974 / 11980
页数：7
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