Synthesis of MoS2-QDs@Fe3O4 nanocomposites decorated on reduced-graphene-oxide: Application in sensitive electrocatalytic determination of hydrazine

Abstract

In the present work, a novel sensitive sensor for hydrazine determination was introduced based on modifying a glassy carbon electrode with MoS2-QDs@Fe3O4/rGO nanocomposite. The synthesized MoS2-QDs@Fe3O4/rGO nanocomposite was analyzed by field emission scanning electron microscopy (FE-SEM), transmission electron microscope (TEM), FT-IR, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), vibrating-sample magnetometry (VSM), and Brunauer–Emmett–Teller (BET) technique. The proposed structure was confirmed by the above techniques. Cyclic voltammetry (CV), differential pulse voltammetry (DPV), and chronoamperometry techniques were used for electrochemical investigations. The effective surface area of the modified electrode and the diffusion coefficient of hydrazine were obtained as 0.1213 cm2 and 4.42 × 10−6 cm2s−1, respectively. Finally, by using the DPV technique, was recorded the calibration curve for hydrazine. Under the optimized conditions, a linear range of 0.8–2190 µM, a limit of detection of 0.12 µM, Limit of Quantitation of 0.4 µM, and sensitivity of 0.0353μAμM−1 were obtained for hydrazine through the DPV technique using the proposed sensor.