Figure 5. CV response of GO (a), GO@PDA (b), RGO (c) and RGO@PDA composite (d) modified electrodes in the presence of 2 mM CPZ in N₂ saturated PBS at a scan rate of 50 mV/s.

The potential of CPZ and the oxidation peak current response at different modified electrodes are shown in the Inset. The error bars are relative to five measurements.