Abstract: A novel sensor based on CuHCF/Nafion/g-C3N4 nano-sheet nanocomposite has been developed for rapid and selective sensing of hydrazine hydrate. The nanocomposite was prepared by ultrasonic dispersion of the mixture of copper hexacyanoferrate (CuHCF), prepared from the reaction between potassium ferricyanide and copper nitrate, and C3N4 nano-sheet, obtained by high temperature pyrolysis of melamine followed by ultrasonic treatment of the g-C3N4 suspension, in aqueous ethanol containing Nafion. The morphology and structure of the materials were characterized by scanning electron microscope (SEM), X-ray diffractometer (XRD) and Brunauer-Emmett-Teller (BET) specific surface area analyzer. The as-prepared CuHCF/Nafion/g-C3N4 nanocomposite modified glassy carbon electrode showed excellent electrochemical performance towards the oxidation of hydrazine by means of cyclic voltammetry and chronoamperometry. Under optimized experimental conditions, the anodic current was linearly proportional to the hydrazine hydrate concentration in the range of 10 to 1 100 μmol/L. The detection limit of the method was as low as 1 μmol/L. Furthermore, results also showed that the sensor had good selectivity, stability and reproducibility.

Key words: CuHCF, g-C3N4, hydrazine hydrate, chemically modified electrode