Fabrication of CdSe quantum dots @ nickel hexacyanoferrate core-shell nanoparticles modified electrode for the electrocatalytic oxidation of hydrazine

We have reported an efficient method to immobilize the electroactive nickel hexacyanoferrate (NiHCF) on CdSe quantum dots (QDs). CdSe QDs @ NiHCF core-shell nanoparticles (NPs) were successfully synthesized and characterized using Fourier transform infrared spectroscopy and transmission electron microscopy. A simple, stable and reproducible CdSe QDs @ NiHCF NPs modified electrode has been constructed as a sensing platform for the electrochemical determination of hydrazine. The electrochemical behavior of CdSe QDs @ NiHCF NPs modified electrode was studied by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal condition the modified electrode exhibits well defined redox peaks at a formal potential of 0.31V which corresponds to the redox reaction of hexacyanoferrate (II/III) of NiHCF. The sensor showed an enhanced electrocatalytic activity towards the oxidative determination of hydrazine in the concentration range of 1.6-1300 mu M with the detection limit of 0.5 mu M. The sensor has been tested for analysis of real samples, which makes it useful in practical area of environmental applications.