Fig. 6. (a) DPV curves of MoS2-PANI/rGO/GCE in 0.1 M PBS (pH 7.0, 0.1 M KCl) containing AA, DA, and UA with different concentrations. The concentration from bottom to top: 30 μM to 3.0 mM for AA, 3.0 to 300 μM for DA, and 2.0 to 200 μM for UA, respectively. The plots of the oxidative peak currents versus the concentrations of (b) AA, (c) DA, and (d) UA.
