Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received August 30, 2001
Accepted October 15, 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
Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO2
Deparment of Ceramics Engineering, Changwon National University, 9 Sarim-Dong, Changwon, Gyungnam 641-773, Korea 1School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea 2School of Material Science and Engineering, Seoul National University, Seoul 151-742, Korea 3School of mechatronics, Changwon National University, 9 Sarim-Dong, Changwon, Gyungnam 641-773, Korea
mjkim@sarim.changwon.ac.kr
Korean Journal of Chemical Engineering, November 2001, 18(6), 873-878(6), 10.1007/BF02705611
Download PDF
Abstract
The electrical conductivity (σ), photoconductivity and photocatalytic reactivity in doped crystalline TiO2 were measured as a function of the oxygen partial pressure (Po2), temperature, doping type and UV irradiation. The Po, dependence of σ suggests that the predominant atomic defects in pure TiO2 are oxygen vacancies (V(o)..) and interstitial titanium ions (Ti(i)...), but the dominant defect is changed with Po2 and temperature. The photoexcited electrons in reduced and/or n-type doped TiO2 enhance both the photoconductivity and the photocatalytic reactivity by the reduction process. Therefore, these behaviors are strongly dependent on the electron concentration.
References
Baek SB, Lee SI, Kim MH, Korean J. Mater. Res., 9, 57 (1999)
Balachandran U, Eror NG, J. Mater. Sci., 23, 2676 (1988)
Chai YS, Lee JC, Kim BW, Korean J. Chem. Eng., 17(6), 633 (2000)
Chiang YM, Birnie D, Kingery WD, "Physical Ceramics," John Wiley and Sons, Inc., 131 (1997)
Dirstine RT, Rosa CJ, Z. Metallkunde Bd., 70(H.5), 322 (1979)
Fujishima A, Honda K, Nature, 37, 238 (1972)
Herrmann JM, Disdier J, Pichat P, Chem. Phys. Lett., 108, 618 (1984)
Dejongh PE, Vanmaekelbergh D, J. Phys. Chem. B, 101(14), 2716 (1997)
Kasuga T, Hiramatsu M, Hirano M, Hoson A, Oyamada K, J. Mater. Res., 12, 607 (1997)
Kim MH, Baek SB, Paik UG, J. Korean Phys. Soc., 32, S1127 (1998)
Kormann C, Bahnemann DW, Hoffmann MR, J. Phys. Chem., 92, 5196 (1988)
Lee SI, Baek SB, Kim MH, Korea Ceram. Soc., 36, 1135 (1999)
Lee SI, "A Study on the Defect Types and Electrical Properties of TiO2 Doped with Donor and Acceptor," M.S. Thesis, Changwon National University (2001)
Nakato Y, Akanuma H, Magari Y, Yae S, Shimizu JI, Mori H, J. Phys. Chem. B, 101(25), 4934 (1997)
Tani E, Baumard JF, J. Solid State Chem., 32, 105 (1980)
Tien TY, Stadler HL, Gibbons EF, Zacmanidis PJ, Ceram. Bull., 54, 280 (1975)
Watanabe T, Fujishima A, Honda K, B. Chem. Soc. Jpn., 49, 353 (1976)
Yamashita H, Kawasaki S, Ichihashi Y, Takeuchi M, Harada M, Anpo M, Louis C, Che M, Korean J. Chem. Eng., 15(5), 491 (1998)
Zaban A, Meier A, Gregg BA, J. Phys. Chem. B, 101(40), 7985 (1997)
Balachandran U, Eror NG, J. Mater. Sci., 23, 2676 (1988)
Chai YS, Lee JC, Kim BW, Korean J. Chem. Eng., 17(6), 633 (2000)
Chiang YM, Birnie D, Kingery WD, "Physical Ceramics," John Wiley and Sons, Inc., 131 (1997)
Dirstine RT, Rosa CJ, Z. Metallkunde Bd., 70(H.5), 322 (1979)
Fujishima A, Honda K, Nature, 37, 238 (1972)
Herrmann JM, Disdier J, Pichat P, Chem. Phys. Lett., 108, 618 (1984)
Dejongh PE, Vanmaekelbergh D, J. Phys. Chem. B, 101(14), 2716 (1997)
Kasuga T, Hiramatsu M, Hirano M, Hoson A, Oyamada K, J. Mater. Res., 12, 607 (1997)
Kim MH, Baek SB, Paik UG, J. Korean Phys. Soc., 32, S1127 (1998)
Kormann C, Bahnemann DW, Hoffmann MR, J. Phys. Chem., 92, 5196 (1988)
Lee SI, Baek SB, Kim MH, Korea Ceram. Soc., 36, 1135 (1999)
Lee SI, "A Study on the Defect Types and Electrical Properties of TiO2 Doped with Donor and Acceptor," M.S. Thesis, Changwon National University (2001)
Nakato Y, Akanuma H, Magari Y, Yae S, Shimizu JI, Mori H, J. Phys. Chem. B, 101(25), 4934 (1997)
Tani E, Baumard JF, J. Solid State Chem., 32, 105 (1980)
Tien TY, Stadler HL, Gibbons EF, Zacmanidis PJ, Ceram. Bull., 54, 280 (1975)
Watanabe T, Fujishima A, Honda K, B. Chem. Soc. Jpn., 49, 353 (1976)
Yamashita H, Kawasaki S, Ichihashi Y, Takeuchi M, Harada M, Anpo M, Louis C, Che M, Korean J. Chem. Eng., 15(5), 491 (1998)
Zaban A, Meier A, Gregg BA, J. Phys. Chem. B, 101(40), 7985 (1997)
