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. 2020 Sep 22;15:182. doi: 10.1186/s11671-020-03413-x

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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. 7 — a Emission spectra of CDs recorded from 5 to 85 °C, excited at 320 nm. b Fluorescence intensities of the 400 and 465 nm peaks versus temperature. c The ratio of the 400 nm over the 465 nm peaks as a function of temperature. d Temperature reversibility study of CDs between 20 and 50 °C. (Reproduced from reference [14])