Premium
Adsorption of 3‐ and 4‐benzoylpyridine on colloidal silver particles: a surface‐enhanced Raman scattering study
Author(s) -
Chowdhury Joydeep,
Ghosh Manash
Publication year - 2004
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1241
Subject(s) - raman scattering , raman spectroscopy , colloid , chemistry , adsorption , analytical chemistry (journal) , absorption band , absorption (acoustics) , resonance (particle physics) , silver nanoparticle , spectral line , molecule , photochemistry , materials science , nanoparticle , nanotechnology , optics , organic chemistry , physics , astronomy , composite material , particle physics
Abstract 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. Copyright © 2004 John Wiley & Sons, Ltd.