ELECTRICAL AND OPTICAL-PROPERTIES OF POROUS NANOCRYSTALLINE TIO2 FILMS

Authors
CAO F OSKAM G SEARSON PC STIPKALA JM HEIMER TA FARZAD F MEYER GJ
Citation
F. Cao et al., ELECTRICAL AND OPTICAL-PROPERTIES OF POROUS NANOCRYSTALLINE TIO2 FILMS, Journal of physical chemistry, 99(31), 1995, pp. 11974-11980
Citations number
71
Categorie Soggetti
Chemistry Physical
Journal title
Journal of physical chemistry → ACNP
ISSN journal
00223654
Volume
99
Issue
31
Year of publication
1995
Pages
11974 - 11980
Database
ISI
SICI code
0022-3654(1995)99:31<11974:EAOOPN>2.0.ZU;2-R
Abstract
The optical and electrochemical properties of nanocrystalline TiO2 ele ctrodes in acidic aqueous solution are reported. Cyclic voltammetry, U V/vis/NIR attenuance, EPR, photocurrent spectroscopy, and electrochemi cal impedance measurements are presented. At negative applied potentia ls the TiO2 films turn black, and an EPR spectrum appears which we att ribute to Ti(III) species. The results are described in terms of a mod el in which the reduction of TiO2 leads to band edge unpinning.