物理化学学报 >> 2012, Vol. 28 >> Issue (12): 2953-2957.doi: 10.3866/PKU.WHXB20121127

光化学和辐射化学 上一篇    下一篇

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

蒋礼林1,2, 刘伟龙1, 宋云飞1, 何兴1, 王阳1, 吴红琳1, 杨延强1   

  1. 1. 哈尔滨工业大学物理系, 凝聚态科学与技术研究中心, 哈尔滨 150001;
    2. 贺州学院, 物理与电子信息工程系, 广西 贺州 542800
  • 收稿日期:2012-07-03 修回日期:2012-08-31 发布日期:2012-11-14
  • 通讯作者: 杨延强, 蒋礼林 E-mail:yqyang@hit.edu.cn; jianglilin2009@gmail.com
  • 基金资助:

    国家自然科学基金(20973050, 21173063, 21003033);广西自然科学青年基金(2012GXNSFBA053012);广西教育厅科研基金(200103YB140, 200807LX015);中国工程物理研究院科学与技术发展基金(2010B0101001)和冲击波与爆轰物理重点实验室基金(9140C67130208ZS75)资助项目

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).

摘要:

通过对香豆素343(C343)染料敏化TiO2纳米粒子光致电子转移的荧光和拉曼光谱特性的研究表明,C343染料敏化TiO2纳米粒子稳态吸收光谱和稳态荧光光谱的红移归因于从被吸附的C343染料分子激发态和C343/TiO2复合物到TiO2纳米粒子导带的光致电子转移. 由时间分辨荧光光谱确定了C343染料敏化TiO2纳米粒子的逆向电子转移速率常数为τ1=31 ps. C343 染料敏化TiO2纳米粒子体系拉曼光谱的研究表明, 被吸附在界面处的染料分子主链碳键的伸缩振动和碳环的呼吸运动的振动模式对超快界面光致电子转移有着重要的促进作用.

关键词: C343染料, TiO2纳米粒子, 光致电子转移, 时间分辨荧光光谱, 伸缩振动

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