Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO2

Myong-Ho Kim; Soon Il Lee; Tae-Kwon Song; Hyunwoong Park; Wonyong Choi; Han-Il Yoo; Tae-Gone Park

Korean Journal of Chemical Engineering, Vol.18, No.6, 873-878, November, 2001

DOI10.1007/BF02705611 Export Citation

Correlations among Defect Type, Photoconductivity and Photoreactivity of Doped TiO2

Myong-Ho Kim^†, Soon Il Lee, Tae-Kwon Song, Hyunwoong Park¹, Wonyong Choi¹, Han-Il Yoo², and Tae-Gone Park³

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

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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.

Keywords:Defect Type;Photoconductivity;Photoreactivity;Charge Compensation;Doping Effect

[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)

[Referenced By]

[Related Articles]

[1] Baek SB, Lee SI, Kim MH, Korean J. Mater. Res., 9, 57 (1999)

[2] Balachandran U, Eror NG, J. Mater. Sci., 23, 2676 (1988)

[3] Chai YS, Lee JC, Kim BW, Korean J. Chem. Eng., 17(6), 633 (2000)

[4] Chiang YM, Birnie D, Kingery WD, "Physical Ceramics," John Wiley and Sons, Inc., 131 (1997)

[5] Dirstine RT, Rosa CJ, Z. Metallkunde Bd., 70(H.5), 322 (1979)

[6] Fujishima A, Honda K, Nature, 37, 238 (1972)

[7] Herrmann JM, Disdier J, Pichat P, Chem. Phys. Lett., 108, 618 (1984)

[8] Dejongh PE, Vanmaekelbergh D, J. Phys. Chem. B, 101(14), 2716 (1997)

[9] Kasuga T, Hiramatsu M, Hirano M, Hoson A, Oyamada K, J. Mater. Res., 12, 607 (1997)

[10] Kim MH, Baek SB, Paik UG, J. Korean Phys. Soc., 32, S1127 (1998)

[11] Kormann C, Bahnemann DW, Hoffmann MR, J. Phys. Chem., 92, 5196 (1988)

[12] Lee SI, Baek SB, Kim MH, Korea Ceram. Soc., 36, 1135 (1999)

[13] 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)

[14] Nakato Y, Akanuma H, Magari Y, Yae S, Shimizu JI, Mori H, J. Phys. Chem. B, 101(25), 4934 (1997)

[15] Tani E, Baumard JF, J. Solid State Chem., 32, 105 (1980)

[16] Tien TY, Stadler HL, Gibbons EF, Zacmanidis PJ, Ceram. Bull., 54, 280 (1975)

[17] Watanabe T, Fujishima A, Honda K, B. Chem. Soc. Jpn., 49, 353 (1976)

[18] Yamashita H, Kawasaki S, Ichihashi Y, Takeuchi M, Harada M, Anpo M, Louis C, Che M, Korean J. Chem. Eng., 15(5), 491 (1998)

[19] Zaban A, Meier A, Gregg BA, J. Phys. Chem. B, 101(40), 7985 (1997)