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. 2023 Jan 16;9(1):19. doi: 10.3390/jimaging9010019

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Full range XPS analysis of watermelon-CQDs prepared by adding (a) ethanol amine; (b) ethylene diamine; high-resolution XPS spectra of the C1s region of watermelon-CQDs synthesized by adding (c) ethanol amine; (d) ethylene diamine.