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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/).
(a) Picture and (b) TEM and HRTEM (inset) images of GQDs by hydrothermal treatment of GO-QDs. (c) Picture and (d) SEM image of product after hydrothermal treatment of GO.