Graphene Oxide Modified Electrodes for Dopamine Sensing

Figure 3

(a) Schematic fabrication process of AuNP/Gr/OPPy-MIP/GCE and its recognition for DA. (b) CVs for 1 mM AA, 50 μM UA, and 10 μM DA, in 0.1 MPBS at AuNP/Gr/OPPy/GCE. (c) DPVs of mixture solution of different concentrations (2.0, 3.5, and 5.0 μM) of DA, 1 mM AA, and 50 μM UA in 0.1 M PBS at AuNP/Gr/OPPy-MIP/GCE. (d) Schematic illustration of the fabrication process of electrochemical sensors for the determination of DA. (e) Differential pulse voltammograms (DPVs) for AA and DA at bare GCE (A), GO/GCE (B), PLL/GCE (C), GO-PLL/GCE (D), GO-Ag/GCE (E), and GO-Ag/PLL/GCE (F).