Fig. 6. (a) CV curves of LS–rGO/GCE in 0.1 M PBS (pH = 7.0) containing various concentrations of DA (0, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 μM) at a scan rate of 50 mV s−1. (b) Linear relationship of peak potential with concentration. (c) DPV curves of LS–rGO/GCE in 0.1 M PBS (pH = 7.0) containing various concentrations of DA (0, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 μM). DPV settings: step potential: 4 mV; amplitude: 50 mV; pulse period: 0.2 s; and amplitude: 50 mV. (d) Linear relationship between peak potential (Ipa) with concentration.
