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Chemical Effect of SERS with Near‐Infrared Excitation
Author(s) -
Liang E. J.,
Kiefer W.
Publication year - 1996
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/(sici)1097-4555(199612)27:12<879::aid-jrs45>3.0.co;2-6
Subject(s) - raman scattering , excitation , ion , surface plasmon resonance , chemistry , infrared , plasmon , surface plasmon , raman spectroscopy , absorption (acoustics) , analytical chemistry (journal) , halide , wavelength , materials science , photochemistry , optoelectronics , inorganic chemistry , optics , nanotechnology , nanoparticle , electrical engineering , organic chemistry , composite material , chromatography , engineering , physics
We have studied the influence of halide and halate ions on the enhancement factors of surface‐enhanced Raman scattering (SERS) in the near‐infrared (NIR) wavelength region. It was found that not only an electromagnetic enhancement mechanism but also a chemical enhancement mechanism contributes to the total surface enhancement in the NIR‐SERS. The enhancement factor of the former is proportional to the absorption of the surface plasmon excitation resonance. Based on the experimental results, we formulated an expression for the estimation of the chemical enhancement factor. The chemical enhancement factors for pyridine on a colloidal silver surface were estimated to be approximately 69, 163, 27, 174 and 92 in the presence of Cl − , Br − , ClO 3 − , BrO 3 − and IO 3 − ions respectively.