Gold Nanoparticles‐electrochemically Reduced Graphene Oxide/Poly(indole‐5‐carboxylic acid) Nanocomposite for Electrochemical Non‐enzymatic Sensing of Hydrogen Peroxide

Abstract Herein, co‐electrodeposition of AuNPs and ERGO onto GCE was conducted to prepare the modified electrode, GCE/AuNPs‐ERGO. The poly(indole‐5‐carboxylic acid) (P(In‐5‐COOH) was then coated onto the GCE/AuNPs‐ERGO with the help of electropolymerization. FT‐IR, FE‐SEM and EDX, and XRD techniques were employed to characterize the prepared nanocomposite. The nanocomposite modified electrode (GCE/AuNPs‐ERGO/P(In‐5‐COOH)) was examined for the electrochemical reduction of H2O2 using chronoamperometry. A high reduction current for H2O2 was observed due to the synergistic effect between AuNPs‐ERGO and P(In‐5‐COOH). The proposed sensor demonstrated a wide linear range of 0.025–750 μmol L−1, with a LOD of 0.008 μmol L−1 at −0.4 V. Furthermore, the developed sensor was applied for the detection of H2O2 in fetal bovine serum and urine samples.