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Surface‐enhanced Raman spectroscopy of silver etched by CrO 3 H 2 SO 4 : Study of adsorbed sulphate
Author(s) -
Pagan M.,
Quagliano L. G.,
Mattioli L.,
Mattei G.
Publication year - 1991
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.1250221216
Subject(s) - raman spectroscopy , adsorption , chemistry , analytical chemistry (journal) , inorganic chemistry , infrared spectroscopy , pyridine , surface enhanced raman spectroscopy , ion , silver nitrate , raman scattering , nuclear chemistry , organic chemistry , physics , optics
The surface‐enhanced Raman (SER) spectra of sulphate adsorbed on silver were obtained by treating it with a sulphochromic mixture, CrO 3 H 2 SO 4 . When nitrate or pyridine are added to the etching solution, there is evidence that both species can co‐adsorb with sulphate. The analysis of SER bands obtained under different conditions indicates that in some cases sulphate is perhaps physically adsorbed on the surface, preserving its free ion T d symmetry, whereas in others it is chemisorbed, presumably in the form of a bidentate complex having C 2ν symmetry. The antisymmetric stretching vibrational mode ν 3 of sulphate is very sensitive to the presence of species co‐adsorbed on the surface.