Figure 7.
(A) CV response for different scan rates from 10–200 mV/s using GA-RGO/AuNPs modified electrode containing 100 μM DA in N2 saturated 0.05 M PBS. (B) Linear plot for scan rate vs. Ipa of DA. (C) Effect of different pH solutions (3, 5, 7 and 9) using GA-RGO/AuNPs modified electrode containing 100 μM DA, N2 saturated 0.05 M PBS, and scan rate of 50 mV/s. (D) Calibration plot for Epa vs. pH.