high-sensitive amperometric hydrazine sensor based on chemically synthesized zinc nitroprusside nanoparticle-supported carbon ceramic electrode

Zinc nitroprusside (znnp) nanoparticles were fabricated at the surface of zinc powder-doped carbon ceramic electrode (cce) by a chemical derivatization process. this modified electrode was characterized by scanning electron microscopy, atomic force microscopy and cyclic voltammetry techniques. the charge transfer rate constant (k s) and charge transfer coefficient (α) were calculated for the electron exchange reaction of the znnp thin film. the znnp nanoparticle-modified cce (znnp|cce) showed good electrocatalytic activity toward hydrazine oxidation. the limit of detection (s/n = 3) and sensitivity were found to be 0.16 µm and 0.21 µa/µm, respectively. the mechanism of hydrazine electrooxidation at the electrode surface was studied. finally, the znnp|cce was successfully used for the determination of trace amount of hydrazine in different spiked and real samples.