Adsorption of 3-and 4-benzoylpyridine on colloidal silver particles: a surface-enhanced Raman scattering study

作者：Chowdhury J^*; Ghosh M

来源：Journal of Raman Spectroscopy, 2004, 35(12): 1023-1033.

DOI：10.1002/jrs.1241

• SERS
• vibrational assignments
• benzoylpyridine
• silver colloids

Surface-enhanced Raman scattering (SERS) spectra of 3- and 4-benzoylpyridine (BP) adsorbed on silver hydrosols were compared with the FTIR and normal Raman spectra in bulk and in solution. With a small fractional change in adsorbate concentration, the SER spectra of isomeric BPs show significant changes in their features, indicating different orientational changes of the different parts of the flexible molecule on the colloidal silver surface with adsorbate concentration. The appearance of a broad, long-wavelength band in the absorption spectra of the silver sol due to solute-induced coagulation of colloidal silver particles is found to be red shifted with increase in adsorbate concentration. The SER excitation profiles indicate that the resonance of the Raman excitation radiation with the new aggregation band contributes more to the SERS intensity than that with the original sol band.

• 出版日期2004-12