Fig. 5. (a) Cyclic voltammograms of 3D-rGO/β-CD/GCE in 0.1 M PB solution of pH 7.0 containing 50 μM DA at different scan rates from 10 to 200 mV s−1. Inset: linear plot between peak currents of DA and the scan rates. (b) Influence of pH of PB on the peak current and potential for the determination towards 50 μM DA at 3D-rGO/β-CD/GCE. Influence of accumulation time (c) and volume of 3D-rGO/β-CD (2 mg mL−1) (d) on detection of 50 μM DA at 3D-rGO/β-CD/GCE in 0.1 M PB of pH 7.0.
