Directional Raman scattering spectra of metal–sulfur bonds at smooth gold and silver substrates
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2021-05-06
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John Wiley & Sons Ltd
Abstract
The gold–sulfur (Au–S) and silver–sulfur (Ag–S) bonds are integral to the surface modification of metal films with alkanethiol monolayers. Although the metal–sulfur bond can be characterized with surface-enhanced Raman spectroscopy (SERS) at roughened metal films, some applications require or perform better when using a smooth metal surface, which is not suitable for SERS signal enhancement. Directional-surface-plasmon-coupled Raman scattering (directional Raman scattering) is an approach to measure metal–sulfur bonds on smooth metal films with sub-monolayer sensitivity. The metal–sulfur bonds formed from a benzenethiol monolayer on smooth planar gold or silver films are observed in the directional Raman scattering spectra between 240 and 270 cm−1; the signal-to-noise ratio of the Au–S Raman peak is 60. Importantly, the directional Raman scattering signal measured with smooth metal surfaces can be simply modeled and easily compared across many samples. Directional Raman scattering can also be measured at roughened metal films, which makes it applicable for many analyses.
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This article is published as Nyamekye, Charles KA, Stephen C. Weibel, and Emily A. Smith. "Directional Raman scattering spectra of metal–sulfur bonds at smooth gold and silver substrates." Journal of Raman Spectroscopy 52, no. 7 (2021): 1246-1255. doi: https://doi.org/10.1002/jrs.6124.
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© 2021 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.