中国物理B ›› 2004, Vol. 13 ›› Issue (5): 720-724.doi: 10.1088/1009-1963/13/5/025

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Synchrotron small angle x-ray scattering study of dye-sensitized/-unsensitized TiO2 nanoparticle colloidal solution

洪新国1, 都鲁超2, 叶满萍2, 翁羽翔2   

  1. (1)Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China; (2)Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2003-08-28 修回日期:2003-11-19 出版日期:2004-05-06 发布日期:2005-07-06
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10375075) and by the Innovation Foundation of the Institute of High Energy Physics, Chinese Academy of Sciences.

Synchrotron small angle x-ray scattering study of dye-sensitized/-unsensitized TiO2 nanoparticle colloidal solution

Hong Xin-Guo (洪新国)a, Du Lu-Chao (都鲁超)b, Ye Man-Ping (叶满萍)b, Weng Yu-Xiang (翁羽翔)b   

  1. a Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China; b Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2003-08-28 Revised:2003-11-19 Online:2004-05-06 Published:2005-07-06
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10375075) and by the Innovation Foundation of the Institute of High Energy Physics, Chinese Academy of Sciences.

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摘要： The wide-gap semiconductor TiO_2 nanoparticles with and without dye sensitization have been studied by small angle x-ray scattering using synchrotron radiation. Surface properties of the colloidal TiO_2 nanoparticles have been analysed in terms of the surface fractal dimensions (D_s), showing that D_s changes from 3.25 to 2.34 when TiO_2 nanoparticles are sensitized by ATRA (all-trans-retinoic acid), which reveals that the surface of the particles become relatively smooth after dye sensitization. The size distribution of gyration radius of TiO_2 nanoparticles in the colloids M(R_g) has been successfully determined by the Shull－Roess method. The main peak of M(R_g) for the unsensitized TiO_2 colloid is located at 2.1nm, corresponding to a spherical diameter of 5.4nm, and this value for the ATRA sensitized TiO_2 increases to 2.4nm, indicating a spherical diameter of 6.4nm. Such a size enlargement of TiO_2 nanoparticles suggests that there is a coating of ATRA on the TiO_2 surface, supporting the view that a monolayer of the dye has been attached to the surface of the TiO_2 nanoparticle.

关键词: TiO_2 nano-particles, small angle x-ray scattering, colloid, solar cell

Abstract: The wide-gap semiconductor TiO$_2$ nanoparticles with and without dye sensitization have been studied by small angle x-ray scattering using synchrotron radiation. Surface properties of the colloidal TiO$_2$ nanoparticles have been analysed in terms of the surface fractal dimensions ($D_{\rm s}$), showing that $D_{\rm s}$ changes from 3.25 to 2.34 when TiO$_2$ nanoparticles are sensitized by ATRA (all-trans-retinoic acid), which reveals that the surface of the particles become relatively smooth after dye sensitization. The size distribution of gyration radius of TiO$_2$ nanoparticles in the colloids $M(R_{\rm g}$) has been successfully determined by the Shull－Roess method. The main peak of $M(R_{\rm g}$) for the unsensitized TiO$_2$ colloid is located at 2.1nm, corresponding to a spherical diameter of 5.4nm, and this value for the ATRA sensitized TiO$_2$ increases to 2.4nm, indicating a spherical diameter of 6.4nm. Such a size enlargement of TiO$_2$ nanoparticles suggests that there is a coating of ATRA on the TiO$_2$ surface, supporting the view that a monolayer of the dye has been attached to the surface of the TiO$_2$ nanoparticle.

Key words: TiO$_2$ nano-particles, small angle x-ray scattering, colloid, solar cell

中图分类号:  (Colloids)

  • 82.70.Dd
78.70.Ck (X-ray scattering) 68.47.Fg (Semiconductor surfaces)