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-Lin1,2, LIU Wei-Long1, SONG Yun-Fei1, HE Xing1, WANG Yang1, WU Hong-Lin1, YANG Yan-Qiang1   

  1. 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:

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

MSC2000: 

  • O649