27 April 2016 Surface-enhanced Raman scattering from 4-aminothiophenol molecules embedded inside Ag coated gold nanorods
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Abstract
Here we report on the preparation of uniform Au@Ag core/shell nanorods with a controllable Ag shell thickness. 4- aminothiophenol molecules, used as the Raman reporters, were placed between the Au core and the Ag shell. The dependence of Raman intensity on the inside/surface location of the reporter molecules was studied. The interior molecules showed a strong and uniform Raman intensity, at least an order of magnitude higher than that of the molecules on the nanoparticle surface. In contrast to usual surface-functionalized Raman tags, aggregation and clustering of nanoparticles with embedded molecules decreased the SERS signal. The findings from this study provide the basis for a novel technique of low analyte concentration detection based on high SERS response inside the core/shell metal nanostructures.
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Boris N. Khlebtsov, Boris N. Khlebtsov, "Surface-enhanced Raman scattering from 4-aminothiophenol molecules embedded inside Ag coated gold nanorods", Proc. SPIE 9887, Biophotonics: Photonic Solutions for Better Health Care V, 988716 (27 April 2016); doi: 10.1117/12.2222520; https://doi.org/10.1117/12.2222520
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