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Adsorption and surface-enhanced Raman of dyes on silver and gold sols
P. C. Lee,Dan Meisel +1 more
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Several negatively charged dyes were investigated for their possible adsorption on the surface of colloidal particles and those dyes that were found to adsorb on the particles were then checked for surface enhancement of Raman scattering.Abstract:
Several negatively charged dyes were investigated for their possible adsorption on the surface of silver and gold colloidal particles. Those dyes that were found to adsorb on the particles were then checked for surface enhancement of Raman scattering. Highly efficient surface-enhanced Raman scattering (SERS) was observed from a carbocyanine dye in both sols. Excitation-dependence studies as well as adsorption studies confirm the SERS nature of the Raman spectra obtained. The dye is probably aggregated on adsorption and is probably attached through the naphthalene side moiety to the surface. Less efficient SERS was also observed for copper phthalocyanine.read more
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Sujit Kumar Ghosh,Tarasankar Pal +1 more
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Journal ArticleDOI
Surface Enhanced Raman Scattering Enhancement Factors: A Comprehensive Study
TL;DR: In this article, the authors present an in-depth study of surface enhanced Raman scattering (SERS) enhancement factors and cross-sections, including several issues often overlooked, and demonstrate that SERS EFs as low as 107, as opposed to the figure of 1014 often claimed in the literature, are sufficient for SERS applications.
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