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. 2017 Nov 1;7:14851. doi: 10.1038/s41598-017-14782-2

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Enhancement of Raman peaks by G-SERS substrate. (A) Raman spectra of Ag/SiO₂/Si (black), graphene/SiO₂/Si (blue), and graphene/Ag/SiO₂/Si (red). The number located above each spectrum shows magnifications for the intensity scale. Schematic illustrations for each sample are also shown. (B) Optical microscope image (left) and G’ peak intensity map (right) of G-SERS. (C) Histogram of the observed enhancement factor of G’ peak intensity. (D) Raman spectra of R6G/G-SERS (black) and R6G/Ag/SiO₂/Si (red).