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. 2019 Feb 16;9(2):274. doi: 10.3390/nano9020274

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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UV-Vis spectra of the obtained CQDs and their permeates (a) CQDs1-3 samples and their permeates, (b) CQDs4-6 samples and their permeates, (c) CQDs7-9 samples and their permeates and (d) CQDs-10-11 samples.