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. 2020 May 5;7:15. doi: 10.1186/s40580-020-00225-8

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — Raman spectra of dopamine solution in PBS buffer by using GNS/EPR₅ and Au NPs/GNS/EPR₅ (a), G-SERS spectra of different concentrations of dopamine dissolved in PBS buffer by using Au NPs/GNS/EPR₅ (b), the relationship between the intensities of SERS signals (857, 1074 and 1344 cm⁻¹) and the corresponding concentration of dopamine (c), and G-SERS spectra of different concentrations of dopamine dissolved in human serum by using Au NPs/GNS/EPR₅ (d)