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. 2020 Feb 8;25(3):736. doi: 10.3390/molecules25030736

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© 2020 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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FTIR spectra of the raw CQDs, CQDs with free carboxyl groups and modified CQDs (a) Dot-1-Na (Dot-1 sample containing sodium ions), Dot-1-COOH (sample with removed sodium ions and unblocked free carboxylic groups), Dot-1-R (dots modified with Rhod-OH); (b) Dot-2-Na (Dot-2 sample containing sodium ions), Dot-2-COOH (sample with removed sodium ions and unblocked free carboxylic groups), Dot-2-R (dots modified with Rhod-OH); (c) Dot-1-Na (Dot-3 sample containing sodium ions), Dot-3-COOH (sample with removed sodium ions and unblocked free carboxylic groups), Dot-3-R (dots modified with Rhod-OH); (d) Dot-4-Na (Dot-4 sample containing sodium ions), Dot-4-COOH (sample with removed sodium ions and unblocked free carboxylic groups), Dot-4-R (dots modified with Rhod-OH).