NIR-SURFACE-ENHANCED RAMAN-SCATTERING OF CRYSTAL VIOLET COADSORBED WITH HALIDE AND HALATE IONS

The influence of halide and halate ions as well as pyridine on near-in frared surface enhanced Raman scattering (NIR-SERS) of crystal violet was studied with NIR excitation and a scanning double grating spectrom eter. The interaction of crystal violet with these ions (or the molecu le) and the interaction of crystal violet with colloidal silver surfac e have been revealed. Cl-, Br-, I- and BrO3- ions as well as pyridine give rise to a large enhancement of the Raman modes of crystal violet while no Raman bands of it could be observed in the presence of CIO3- and IO3- ions. The chemical enhancement in the NIR-SERS was found and its enhancement factors caused by Cl-, Br-, I- and BrO3- ions were est imated to be about 49, 77, 15 and 36, respectively.