Concentration-dependent surface-enhanced resonance Raman scattering of a porphyrin derivative adsorbed on colloidal silver particles

被引:33
作者
Chowdhury, J
Ghosh, M
Pal, P
Misra, TN
机构
[1] Sammilani Mahavidyalaya, Baghajatin Stn, Dept Phys, Kolkata 700075, India
[2] Indian Assoc Cultivat Sci, Dept Spect, Kolkata 700032, W Bengal, India
关键词
surface-enhanced Raman scattering; silver colloid; charge transfer; light scattering;
D O I
10.1016/S0021-9797(03)00022-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Surface-enhanced Raman spectra (SERS) of 5,10,15,20-tetrakis(1-decylpyridium-4-yl)-21H,23H-potphintetrabromide or Por 10 (H-2 Tdpyp) adsorbed on silver hydrosols are compared with the FTIR and resonance Raman spectrum (RRS) in the bulk and in solution. Comparative analysis of the RR and the FTIR spectra indicate that the molecule, in its free state, has D-2h symmetry rather than C-2upsilon. The SERS spectra, obtained on adsorption of this molecule on borohydride-reduced silver sol, indicate the formation of silver porphyrin. With the change in the adsorbate concentration, the SERS shows that the molecule changes its orientation on the colloidal silver surface. The appearance of longer wavelength band in the electronic absorption spectra of the sol has been attributed to the coagulation of colloidal silver particles in the sol. The long wavelength band is found to be red-shifted with the decrease in adsorbate concentration. The excitation profile study indicates that the resonance of the Raman excitation radiation with the original sol band is more important than that with the new aggregation band for the SERS activity. This indicates a large contribution of electromagnetic effect to surface enhancement. (C) 2003 Elsevier Science (USA). All rights reserved.
引用
收藏
页码:318 / 326
页数:9
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