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. 2020 Jul 9;10:11380. doi: 10.1038/s41598-020-68397-1

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© The Author(s) 2020

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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Aqueous suspensions of a-G-AuNPs and a-DG-AuNPs (700 μg/mL) under UV (a,b) and visible light (c) irradiation. Emission spectra of a-G-AuNPs (d) and a-DG-AuNPs (e) at variable wavelengths of excitation. Emission spectra with excitation at 287 nm (f) of l-tryptophan (1.5 × 10^–5 mol/L) in absence and in presence of a-G-AuNPs or a-DG-AuNPs (125 µg/mL). * λ_ex; ^# Diffraction at 2λ_ex due to diffraction from the grating of the spectrometer monochromator.