Hydrogen Peroxide Sensor Based On Carbon Nanotubes – Poly(Celestine Blue) Nanohybrid Modified Electrode

摘要

A hydrogen peroxide sensor was developed by constructing a conductive film of poly(celestine blue) (PCB) on multiwalled carbon nanotubes (MWCNTs) modified graphite electrode by electropolymerization. The presence of MWCNTs increased the surface coverage concentration of PCB and the rate of electron transfer. Scanning electron microscopy (SEM) was used to characterize the surface morphology of the modified electrode. The electrochemical characteristics of PCB/MWCNTs modified electrode was evaluated by cyclic voltammetry and chronoamperometry. The results revealed that the modified electrode exhibits higher electrocatalytic activity towards the reduction of hydrogen peroxide (H_2O_2) in 0.1M of NH_4NO_3 (pH 7) at a reduced over potential with increased peak currents. The modified electrode showed a wide concentration range from 6.66×10~(-6) M to 1.34×10~(-3)M with a detection limit of 2.22×10~(-6) M (S/N = 3) and with a sensitivity of 12.592 μA/μM.