结晶紫与卤素或卤酸根离子共吸附的近红外表面增强喇曼散射

NIR Surface enhanced Raman Scattering of Crystal Violet Coadsorbed with Halide and Halate Ions

采用近红外激光（１０６４ｎｍ）激发和扫描式双光栅单色仪研究了卤素、卤酸根离子及吡啶对结晶紫近红外表面增强喇曼散射光谱（ＮＩＲ－ＳＥＲＳ）的影响．揭示了这些离子（或分子）与结晶紫及银表面的相互作用．Ｃｌ－、Ｂｒ－、Ｉ－、ＢｒＯ－３离子及吡啶均能引起结晶紫ＮＩＲ－ＳＥＲＳ的明显增强，而ＣｌＯ－３和ＩＯ－３离子则不能．观察到ＮＩＲ－ＳＥＲＳ中化学增强的直接证据，并估算了化学增强因子．Ｃｌ－、Ｂｒ－、Ｉ－和ＢｒＯ－３离子引起结晶紫ＮＩＲ－ＳＥＲＳ的化学增强因子分别约为４９、７７、１５和３６．

The influence of halide and halate ions as well as pyridine on near infrared surface enhanced Raman scattering(NIR SERS) of crystal violet was studied with NIR excitation and a scanning double grating spectrometer. The interaction of crystal violet with these ions(or the molecule) and the interaction of crystal violet with colloidal silver surface have been revealed. Cl -, Br -, I - and BrO - 3 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 CIO - 3 and IO - 3 ions. The chemical enhancement in the NIR SERS was found and its enhancement factors caused by Cl -, Br -, I - and BrO - 3 ions were estimated to be about 49, 77, 15 and 36, respectively.