Nano Composite of Palladium-Graphene Modified Electrode for Sensing of Hydrazine

A sensitive hydrazine sensor fabricated by one–step electrodeposition of palladium–graphene nanocomposites (Pd–GENCs) on indium tin oxide (ITO) was demonstrated. Scanning electron microscope and energy dispersive X–ray spectroscopy showed the morphology and ingredient of Pd–GENCs. Experimental results of cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry indicated that under the optimum conditions, the currents were dependent linearly on N2H4 concentrations in the range from 0.1 μM to 2.5 mM with a detection limit of 0.02 μM (S/N = 3) and sensitivity of 799.2 μA mM–1 cm –2 . And the response time of the sensor towards N2H4 is less than 3 s. Thus the research provided a new idea for small molecule detection.

Keywords: Sensor; Nano composite; Graphene; Palladium; Hydrazine.