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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(a) The SEM of G/Au substrate; (b) the diameter of Au NPs; (c) Raman spectra of R6G collected from Au NPs and G/Au NPs; (d) simulated electric field distributions in different structures, and the cross section is at the y-z plane; (e) the charge transition channel.