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Surface‐enhanced Raman scattering of CO 2 dissolved in aqueous colloidal solutions of silver and gold
Author(s) -
Kneipp Katrin,
Wang Yang,
Berger Andrew J.,
Dasari Ramachandra R.,
Feld Michael S.
Publication year - 1995
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.1250261006
Subject(s) - raman scattering , colloid , aqueous solution , raman spectroscopy , gold colloid , chemistry , adsorption , molecule , metal , colloidal gold , analytical chemistry (journal) , inorganic chemistry , materials science , nanoparticle , nanotechnology , organic chemistry , optics , physics
The observation of surface‐enhanced Raman scatterings (SERS) from CO 2 molecules dissolved in aqueous solutions of silver and gold colloids measured with 850 nm near‐IR excitation is reported. Different types of surface enhancement and surface‐enhanced Raman spectra were observed. The SERS spectrum of CO 2 on colloidal gold is in good agreement with the spectrum of CO 2 dissolved in water. Two different types of SERS spectra were found for CO 2 on colloidal silver. They can be assigned to physisorbed and/or weakly chemisorbed CO 2 molecules and to strongly bonded CO 2 ‐ negatively charged surface radicals, respectively. The enhancement factor for the stretching mode of carbon dioxide is estimated to be of the order of 10 2 −10 4 , depending on the kinds of metal and types of adsorption, which demonstrates that SERS on colloidal silver or gold particles in solution offers possibilities for detecting CO 2 dissolved in liquids at low concentrations.