Effect of Platinum Loading on Lifetime of Photogenerated Charge Carriers of TiO2 Studied by Time-resolved Photoconductivity

Abstract

Abstract: Time-resolved photoconductivity(TRPC) was used to study the photoconductivity decay of TiO₂ and the lifetime of the photogenerated charge carriers.Also,we investigated the influence of platinum loading on the characters of the photogenerated charge carriers of TiO₂.The results showed that the decay tendency of TiO₂ was delayed with the increase of platinum loading and the effective lifetime of the photogenerated charge carriers of TiO₂ containing 1.0%Pt(mass fraction) was prolonged to 1.57 ms from 0.16 ms without Pt loading.The mentioned results suggested that in the presence of Pt the photogenerated electrons of TiO₂ transfer to Pt from semiconductor rapidly,resulting in achieving the effective separateness between the photogenerated(electrons) and holes,prolonging the effective lifetime of the photogenerated carriers,decreasing the recombination rate of photogenerated electrons and holes,and increasing the quantum efficiency of the photocatalytic(reaction).

Key words: Time-resolved photoconductivity(TRPC), TiO₂, Pt/TiO₂

CLC Number:

O643.36

TrendMD:

ZHANG Wen, WANG Xu-Xu, FU Xian-Zhi . Effect of Platinum Loading on Lifetime of Photogenerated Charge Carriers of TiO₂ Studied by Time-resolved Photoconductivity[J]. Chem. J. Chinese Universities, 2005, 26(10): 1861.

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Effect of Platinum Loading on Lifetime of Photogenerated Charge Carriers of TiO₂ Studied by Time-resolved Photoconductivity

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