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. 2020 Nov 6;10(11):2213. doi: 10.3390/nano10112213

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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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Transmission electron microscopy (TEM) images from (a) carbon dots from CB, (b) carbon dots from CB.H₂SO₄, (c) carbon dots from CB.KOH, and (d) carbon dots from CB.H₂SO₄ + KOH. The bar plots show the mean relative fluorescence units (RFU) at different emission ranges of carbon dots from fraction 0 to 10 kDa and 10 to 30 kDa. Note: Water was used as a control for fluorescence measurements; the maximum difference between the replicas was 101 RFU.