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. 2016 Feb 4;6:20511. doi: 10.1038/srep20511

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ECL intensity–potential curves (A), effect of pH (B) and the concentration of K₂S₂O₈ (C) on the ECL intensity. (a) bare GCE (b) Aminated-GQDs (2.5 mg/mL)/GCE (c) Carboxyl-GQDs (2.5 mg/mL)/GCE (d) Aminated-GQDs (2.5 mg/mL)/Carboxyl-GQDs (2.5 mg/mL)/GCE.