28 October 2009 The surface enhanced Raman spectroscopy of DCM in silver colloid
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Abstract
The surface enhanced Raman spectroscopy of DCM dye was firstly present in this paper. We have studied their chloride ion effects on the surface-enhanced Raman scattering (SERS) activities of the silver solution. For the positive charge dyes, no SERS could be observed without the addition of chloride ions for lack of the electrostatic interaction. The chloride ions served to enlarge silver particles and to contribute the existence of the surface active sites, making the silver solution SERS active to the dye samples. With the change of the DCM concentration, the SERS of DCM show significant change in their features, indicating different orientation changes of the molecule on the colloidal silver surface with DCM concentration. The broad long-wavelength band in the absorption spectra of the silver sol with added DCM at certain concentrations has been explained in terms of the aggregation of the colloidal silver particles.
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Shang-yuan Feng, Jiesi Chen, Qisong Chen, Jianji Pan, Rong Chen, Shaojun Lin, Chao Li, "The surface enhanced Raman spectroscopy of DCM in silver colloid", Proc. SPIE 7519, Eighth International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2009), 75191R (28 October 2009); doi: 10.1117/12.841546; https://doi.org/10.1117/12.841546
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