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Optical Absorption of Dye Molecules Remains Unaffected by Submonolayer Complex Formation with Metal Nanoparticles

Author:
Petráková, Vladimíra, Sampaio, Ian Correa, Reich, Stephanie
Source:
Journal of physical chemistry 2019 v.123 no.28 pp. 17498-17504
ISSN:
1932-7455
Subject:
Raman spectroscopy, absorption, chemical treatment, chlorides, dyes, iodides, nanoparticles, nanosilver, silver, spectral analysis
Abstract:
We investigated molecular absorption in the proximity of metal surfaces. Previously observed modifications in the spectra were found to be specific to treated silver nanoparticles. Moreover, we show that the most dominant new peaks in the absorption spectrum arise from modified plasmonic features of nanoparticles as a result of structural changes of the nanoparticle surface and not from the dye molecules. We examine the role of plasmonic materials, binding of dye molecules, chemical treatment by halides (Cl–, I–), and the selection of dyes on the absorption modulation. Silver halide in combination with specific dye molecules is crucial for changes in absorption. Our findings bring new insights into the process of surface-enhanced Raman spectroscopy on Cl–-treated silver substrates.
Agid:
6539230