Detection of Ascorbic Acid Using Green Synthesized Carbon Quantum Dots

Figure 5

DPV curves of (a) 0.5 mM AA, 2 μM DA, and 0.1 mM UA on GCE (A) and CQDs/GCE (B); (b) of DA on CQDs/GCE in the presence of 2 mM AA; (c) of UA on CQDs/GCE in the presence of 2 mM AA; (d) of AA on CQDs/GCE in the presence of 4 μM DA and 20 μM UA; and (e) of AA, DA, and UA on CQDs/GCE with different concentrations. (f) Amperometric responses of CQDs/GCE upon addition of 0.5 mM AA and 50 mM other chemicals in 0.1 M PBS (pH 7.0) for 1000 s at 0 V.

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