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Size control in the electrochemical synthesis of carbon quantum dots: (A) Diameters of carbon quantum dots electrochemically top-down exfoliated from carbon sheets, applying different voltages. Reproduced with permission from Ref. [63], copyright Wiley, 2011. (B) Diameters of carbon quantum dots electrochemically obtained in a bottom-up approach from ethanol, applying different voltages. Reproduced with permission from Ref. [66], copyright Wiley, 2014.
