Surface modification and photosensitisation of TiO2 nanocrystalline films with ascorbic acid

被引：88

作者：

Xagas, AP

Bernard, MC

Hugot-Le Goff, A

Spyrellis, N

Loizos, Z

Falaras, P ^{[1
]}

机构：

[1] NCSR Demokritos, Inst Phys Chem, Athens 15310, Greece

[2] Univ Paris 06, CNRS, UPR 15, F-75252 Paris 05, France

[3] Natl Tech Univ Athens, Dept Chem Engn, Athens 15780, Greece

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2000年 / 132卷 / 1-2期

关键词：

ascorbic acid; TiO2; films; photosensitisation; AFM; sol-gel;

D O I：

10.1016/S1010-6030(00)00202-1

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：

Semi-transparent microporous TiO2 films on SnO2-coated conductive glass were prepared by applying a sol-gel process. Surface topography analysis was conducted with atomic force microscopy, which revealed a highly textured and rough surface, possessing a high capacity for adsorption of a diverse variety of compounds. Surface modification of the films with ascorbic acid results in the formation of a stable, coloured surface complex which red shifts the absorption threshold of TiO2, enhancing utilisation of the solar spectrum. Upon illumination in a liquid electrochemical cell, ascorbic acid injects electrons into the conduction band of the semiconductor, giving rise to electrical current. The incident-photon-to-current efficiency presents a maximum at 415nm (5.29%). (C) 2000 Elsevier Science S.A. All rights reserved.

引用

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页码：115 / 120

页数：6

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