A high-performance electrochemical dopamine sensor based on a platinum-nickel bimetallic decorated poly(dopamine)-functionalized reduced graphene oxide nanocomposite

A nanocomposite of platinum-nickel bimetallic decorated poly( dopamine)-functionalized reduced graphene oxide ( Pt-Ni/PDA/rGO) was prepared by a facile and attractive method. Furthermore, a highperformance electrochemical sensor for the detection of dopamine was fabricated by dropping the PtNi/PDA/rGO nanocomposites on a glassy carbon electrode. The morphology and composition of the Pt-Ni/PDA/rGO nanocomposites were characterized by field emission-scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, energy-dispersive X-ray spectroscopy, Raman microscopy and X-ray photoelectron spectroscopy. Electrochemical impedance spectroscopy, cyclic voltammetry and chronoamperometry were used to investigate the electrochemical behavior of the Pt-Ni/PDA/rGO nanocomposites. The linear range and detection limit were 0.2-911 mu M and 0.07 mM, respectively. The sensitivity of this non-enzymatic dopamine sensor was calculated to be 912.8 mA mM(-1) cm-2. Moreover, the Pt-Ni/PDA/rGO nanocomposite-modified GCE also showed good antiinterference ability and stability.