A non-enzymatic hydrogen peroxide sensor based on dendrimer functionalized magnetic graphene oxide decorated with palladium nanoparticles

In this study, magnetic graphene oxide functionalized with amine-terminated poly(amidoamine) dendrimer, decorated with palladium nanoparticles (GO-Fe₃O₄-PAMAM-Pd) has been utilized for non-enzymatic electrochemical determination of hydrogen peroxide (H₂O₂). For this purpose, the GO-Fe₃O₄-PAMAM-Pd composite material was immobilized on a glassy carbon electrode (GCE) and its electrocatalytic activity toward H₂O₂ reduction was evaluated with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. It was found that the presence of uniformly dispersed Pd nanoparticles on the magnetic GO nanosheets play a major role in the electrocatalytic performance of the constructed electrochemical sensor. Under optimum conditions, the designed sensor showed good electrochemical performance toward H₂O₂ reduction, offering extended linearity of 0.05 to 160 μM and a low detection limit of 0.01 μM. Besides, the sensor revealed good anti-interference property and high sensitivity toward H₂O₂ detection. The proposed electrode was also credibly employed for the determination of H₂O₂ in real water samples.