Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received September 5, 2001
Accepted October 13, 2001
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.
All issues
Thickness Effect in the Photocatalytic Activity of TiO2 Thin Films Derived from Sol-Gel Process
Department of Chemistry and Center for Chemical Dynamics, Inha University, Inchon 402-751, Korea
wanin@inha.ac.kr
Korean Journal of Chemical Engineering, November 2001, 18(6), 903-907(5), 10.1007/BF02705616
Download PDF
Abstract
TiO2 films in various thicknesses were prepared by sol-gel method, and their photocatalytic activities in the decomposition of gaseous 2-propanol were evaluated. It was found that the photocatalytic activities of transparent TiO2 films increase with the increase of film thickness: The photocatalytic activity of TiO2 films in 670 nm-thickness was 3.7 times that of films in 70 nm-thickness. We proposed that the higher photocatalytic activities for the thicker TiO2 films originate from the greater amount of photogenerated electron and hole pairs, which are transferred from the inside to the surface of TiO2 films. We also provided some experimental evidences supporting this mechanism.
References
Anpo M, Matsuoka M, Hano K, Mishima H, Ono T, Yamashita H, Korean J. Chem. Eng., 14(6), 498 (1997)
Chai YS, Lee JC, Kim BW, Korean J. Chem. Eng., 17(6), 633 (2000)
Cui H, Shen HS, Gao YM, Dwight K, Wold A, Mater. Res. Bull., 28, 195 (1993)
Hoffmann MR, Martin ST, Choi WY, Bahnemann DW, Chem. Rev., 95(1), 69 (1995)
Jung KT, Shul YG, Anpo M, Yamashita H, Korean J. Chem. Eng., 14(3), 213 (1997)
Kwon YT, Song KY, Lee WI, Choi GJ, Do YR, J. Catal., 191(1), 192 (2000)
Matthews RW, J. Catal., 111, 264 (1988)
Nozik AJ, Annu. Rev. Phys. Chem., 29, 189 (1978)
Ohko Y, Hashimoto K, Fujishima A, J. Phys. Chem. A, 101(43), 8057 (1997)
Song KY, Park MK, Kwon YT, Lee HW, Chung WJ, Lee WI, Chem. Mater., 13, 2349 (2001)
Wang R, Hashimoto K, Fujishima A, Chikuni M, Kojima E, Kitamura A, Shimohigoshi M, Watanabe T, Nature, 388(6641), 431 (1997)
Wang R, Hashimoto K, Fujishima A, Chikuni M, Kojima E, Kitamura A, Shimohigoshi M, Watanabe T, Adv. Mater., 10, 135 (1998)
Yu JG, Zhao XJ, Zhao QN, J. Mater. Sci. Lett., 19(12), 1015 (2000)
Chai YS, Lee JC, Kim BW, Korean J. Chem. Eng., 17(6), 633 (2000)
Cui H, Shen HS, Gao YM, Dwight K, Wold A, Mater. Res. Bull., 28, 195 (1993)
Hoffmann MR, Martin ST, Choi WY, Bahnemann DW, Chem. Rev., 95(1), 69 (1995)
Jung KT, Shul YG, Anpo M, Yamashita H, Korean J. Chem. Eng., 14(3), 213 (1997)
Kwon YT, Song KY, Lee WI, Choi GJ, Do YR, J. Catal., 191(1), 192 (2000)
Matthews RW, J. Catal., 111, 264 (1988)
Nozik AJ, Annu. Rev. Phys. Chem., 29, 189 (1978)
Ohko Y, Hashimoto K, Fujishima A, J. Phys. Chem. A, 101(43), 8057 (1997)
Song KY, Park MK, Kwon YT, Lee HW, Chung WJ, Lee WI, Chem. Mater., 13, 2349 (2001)
Wang R, Hashimoto K, Fujishima A, Chikuni M, Kojima E, Kitamura A, Shimohigoshi M, Watanabe T, Nature, 388(6641), 431 (1997)
Wang R, Hashimoto K, Fujishima A, Chikuni M, Kojima E, Kitamura A, Shimohigoshi M, Watanabe T, Adv. Mater., 10, 135 (1998)
Yu JG, Zhao XJ, Zhao QN, J. Mater. Sci. Lett., 19(12), 1015 (2000)
