Abstract
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−, ClO3−, BrO3− and IO3− ions respectively.
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