Fabrication of Prussian Blue/Multi-Walled Carbon Nanotubes Modified Glassy Carbon Electrode for Electrochemical Detection of Hydrogen Peroxide.

Prussian blue nanoparticles synthesized from K4[Fe(CN)6]3H2O and Fe(NO3)3.9H2O, were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Energy dispersive spectroscopy (EDS), Scanning electron microscopy (SEM), and Raman spectroscopy. Prussian blue nanoparticles were modified on a glassy carbon electrode as a mediator of carbon nanotube; three electrodes GC-Bare, GC-PB and GC-CNT-PB were fabricated. Cyclic voltammetry were employed to characterize electrodes at pH ranges of (3 - 7.4) in 0.1M phosphate buffer solution, in the absence or presence of 25 μM of H2O2. Compared with Prussian blue (PB) modified on glassy carbon electrode (GC-PB), the GC-CNT-PB electrode exhibits much electrochemical stability, much wider pH range and high response currents for the reduction of hydrogen peroxide (H2O2).