A Novel Enzyme-Free Hydrogen Peroxide Sensor Based on Electrode Modified with Gold Nanoparticles-Overoxidized Polydopamine Composites

摘要

A new electrode was fabricated by electrodeposition of gold nanoparticles (Au NPs) on overoxidizedpolydopamine (OPDA) modified gold electrode. The integration of Au NPs and the OPDA filmendowed the Au NPs/OPDA modified electrode with high sensitivity and selectivity and goodelectrocatalytic activities to reduction of hydrogen peroxide (H2O2). Compared to electrodes modifiedwith individual Au NPs or OPDA films, the Au NPs/OPDA modified electrode presents the largestcurrent response to reduction of H2O2, due to a possible synergism between the OPDA film and the Au-1 -2 NPs. The proposed H2O2 sensor has a response sensitivity of 52.94 A mM cm and a wide linearrange from 10 M to 8 mM. The detection limit is estimated to be 0.5 M.