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. 2017 Jul 31;7:6917. doi: 10.1038/s41598-017-07186-9

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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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SERS intensity at 1311 cm⁻¹ of R6G (1 μM) using Ag NPs (black) and Ag NP@N-GQD (red) after the NPs were stored (A) in solution and (B) in the dried form, for different numbers of days recorded over 30 days, respectively. Each data point represents the average value from five SERS spectra measured from different locations. Error bars indicate the standard deviations.