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. 2020 Dec 4;10:21262. doi: 10.1038/s41598-020-78070-2

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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 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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(a) Comparison of the PL intensities of 50 μg mL⁻¹ GQDs-500-M solution in the presence of different metal ions (100 µM) at an excitation wavelength of 340 nm. (b) The comparison of the affinity of different metal ions towards GQDs-500-M (F₀ and F are the PL intensities of GQDs-500-M without and with 100 µM of different metal ions). (c) The PL spectra of GQDs-500-M at different concentrations of Fe³⁺ and (d) corresponding linear plot. Three independent experiments were carried out to obtain the mean values. Figures were drawn using OriginPro 2018b (https://www.originlab.com).