Fig. 2. (a) Synthesis of CQDs through CVD method using C2H2 as the carbon source, reprinted with permission from ref. 47, copyright 2016 Elsevier Ltd., (b) synthesis of the CQDs through the hydrothermal method using alanine and ethylenediamine, reprinted with permission from ref. 66, copyright 2015 Elsevier Ltd., (c) microwave-assisted pyrolysis synthesis of magnetofluorescent CQDs from crab shell, reprinted with permission from ref. 81, copyright 2017 American Chemical Society.
