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. 2019 Jun 11;9:8497. doi: 10.1038/s41598-019-43288-2

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© The Author(s) 2019

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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Optical characterizations of the RB-AuNPs. (A) Extinction spectra of RB, AuNPs and RB-AuNPs, (B) Emission spectra of RB, AuNPs and RB-AuNPs under 530 nm excitation, (C) excitation-emission spectrum of RB-AuNPs, the excitation spectrum was obtained at a fixed emission of 590 nm, and (D) Emission map of RB-AuNPs, plotted by setting the x-axis as emission wavelength and y-axis as excitation wavelength. The color represents the relative peak intensity of emission.