Construction of polydopamine/silver nanoparticles multilayer film for hydrogen peroxide detection

A non-enzymatic hydrogen peroxide (H2O2) sensor has been developed based on the polydopamine (PDA)/silver nanoparticles (AgNPs) multilayer film (PDA/AgNPs)n modified glassy carbon electrode (GCE). The (PDA/AgNPs)n multilayer film was fabricated by alternatively dropping dopamine and silver ion solution on GCE taking advantages of the exceptional adhesive and reductive properties of self-polymerized PDA. Electrochemical property of (PDA/AgNPs)n modified GCE was characterized by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Results showed that the as-constructed (PDA/AgNPs)n based sensor possesses encouraging catalytic ability for the reduction of H2O2. The sensor has been employed to test real samples and shows strong potential in practical application.