Figure 4

Cyclic voltammograms of 0.02 mM DA at the bare CPE (curve a), GO (curve b) and E-GO (curve c) in 0.2 M phosphate buffer solution at pH 7.0 with sweep rate 0.05 Vs−1.

Cyclic voltammograms of 0.02 mM DA at the bare CPE (curve a), GO (curve b) and E-GO (curve c) in 0.2 M phosphate buffer solution at pH 7.0 with sweep rate 0.05 Vs−1.