香豆素343敏化TiO2纳米粒子光致电子转移的荧光和拉曼光谱

doi:10.3866/PKU.WHXB20121127

Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (12): 2953-2957.doi: 10.3866/PKU.WHXB20121127

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles Next Articles

Fluorescence and Raman Spectroscopic Characteristics of the Photo-Induced Electron Transfer of Coumarin 343 Dye-Sensitized TiO₂ Nanoparticles

JIANG Li-Lin^1,2, LIU Wei-Long¹, SONG Yun-Fei¹, HE Xing¹, WANG Yang¹, WU Hong-Lin¹, YANG Yan-Qiang¹

1. Centre for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, P. R. China;
2. Department of Physics and Electronics Information Engineering, Hezhou University, Hezhou, 542800, Guangxi Province, P. 1 R. China

Received:2012-07-03 Revised:2012-08-31 Published:2012-11-14
Supported by:
The project was supported by the National Natural Science Foundation of China (20973050, 21173063, 21003033), the Guangxi Natural Science Foundation (2012GXNSFBA053012), the Research Foundation of Education Bureau of Guangxi (200103YB140, 200807LX015), the Science and Technology Development Foundation of CAEP(2010B0101001)and the Pre-Research foundation of CPLA General Armament Department (9140C67130208ZS75).

Abstract

Abstract:

The fluorescence and Raman spectroscopic characteristics of the photo-induced electron transfer of Coumarin 343 (C343) dye-sensitized TiO₂ nanoparticles have been investigated. The results indicate that the red-shift of the absorption spectrum peaks and the fluorescence spectrum maxima can be attributed to the photo-induced electron transfer from the excited state of the absorbed C343 dye molecules and the charge transfer complex (C343/TiO₂) to the conduction band manifold of the TiO₂ nanoparticles. Back electron transfer of the system was investigated by time resolved fluorescence spectroscopy and takes place in around τ₁=31 ps. Raman spectroscopy of the C343 dye-sensitized TiO₂ nanoparticles reveals that the carbon bond stretching vibrations and ring breathing motions of the absorbed C343 dye molecules at the interface significantly contribute to the ultrafast interface photoinduced electron transfer.

Key words: C343 dye, TiO₂ nanoparticle, Photo-induced electron transfer, Time-resolved fluorescence spectroscopy, Stretching vibration

JIANG Li-Lin, LIU Wei-Long, SONG Yun-Fei, HE Xing, WANG Yang, WU Hong-Lin, YANG Yan-Qiang. Fluorescence and Raman Spectroscopic Characteristics of the Photo-Induced Electron Transfer of Coumarin 343 Dye-Sensitized TiO₂ Nanoparticles[J]. Acta Phys. -Chim. Sin. 2012, 28(12), 2953-2957. doi: 10.3866/PKU.WHXB20121127

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Fluorescence and Raman Spectroscopic Characteristics of the Photo-Induced Electron Transfer of Coumarin 343 Dye-Sensitized TiO₂ Nanoparticles

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Fluorescence and Raman Spectroscopic Characteristics of the Photo-Induced Electron Transfer of Coumarin 343 Dye-Sensitized TiO₂ Nanoparticles