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
a Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China; b Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
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.
Received: 28 August 2003
Revised: 19 November 2003
Accepted manuscript online:
Fund: 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.
Cite this article:
Hong Xin-Guo (洪新国), Du Lu-Chao (都鲁超), Ye Man-Ping (叶满萍), Weng Yu-Xiang (翁羽翔) Synchrotron small angle x-ray scattering study of dye-sensitized/-unsensitized TiO2 nanoparticle colloidal solution 2004 Chinese Physics 13 720
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