In the present study, MoS2/reduced graphene oxide (rGO)/Au (MSRG/Au) nanohybrid was synthesized through one-step hydrothermal method and was applied to fabricate the modified electrode in order to detect hydrazine (N2H4, HY). Structure of MSRG/Au nanohybrid was characterized by various analyses including field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), and X-ray powder diffraction (XRD). Electrochemical behaviors of MoS2, MSRG, and MSRG/Au in buffer solution were investigated to show the role of simultaneous presence of rGO carbonaceous material and Au noble metal in improving activities of MoS2. Amperometric response of MSRG/Au-modified glassy carbon electrode (GC electrode) for oxidation of HY had two linear ranges of 2–30 µM and 30 µM–1.5 mM. Limit of detection (LOD) was estimated as 0.5 µM for HY. Because of the synergistic effect of gold nanoparticles, MSRG/Au nanohybrid had higher electrocatalytic activity, yet with less overpotential for oxidation of HY compared to MoS2/GC electrode and MSRG/GC electrode. After investigating the effect of intrusive ions on determination of analyte, the sensor maintained its great stability, reproducibility, and selectivity for detection of HY. Based on the results, modification of MSRG with Au may be an effective sensing platform to detect HY.
