Synthesis of reduced graphene oxide-molybdenum disulfide nanocomposite as potential scaffold for fabrication of efficient hydrazine sensor

Abstract

In this paper, we have reported the facile microwave-assisted synthesis of reduced graphene oxide-molybdenum disulphide (rGO-MoS2) nanocomposites and its utilization for the electrochemical detection of hydrazine. Nanocomposites were synthesized by using graphite oxide and MoS2 as starting material. The phase composition, morphology, structure and composition were analyzed by powdered X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy and transmission electron microscope. Well-defined morphology, crystallinity and two-dimensional (2D) flat structure of rGO-MoS2 nanocomposite have enhanced the detection limit and sensitivity of the sensor. The sensing studies have been conducted by utilizing cyclic voltammetry. The variation in the current with potential was studied by using modified gold electrode, which clearly indicate the enhancement in the peak current (22.0 μA–33.9 μA) and reduction in the overpotential (0.27 V–0.12 V) in case of rGO-MoS2 as compared to MoS2. The sensitivity and the detection limit obtained for rGO-MoS2 were found to be 89.89 μA μM−1 cm−2 and 132 nM respectively, ascribed to the easy charge transfer, improved specific surface area and high conductivity of the nanocomposite.