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(A) Amperometric response curve of CQDs/Cu2O-modified GCE polarized at +0.55 V vs. Ag/AgCl upon successive additions of glucose (100 µM) in 0.1 M NaOH (up to a total of 500 µM); (B) Calibration curve for CQDs/Cu2O-modified GCE electrodes for the determination of glucose. The inset corresponds to a calibration curve for glucose concentrations of 0–10 µM.
