Synthesis and electrochemistry performance of CuO-functionalized CNTs-rGO nanocomposites for highly sensitive hydrazine detection

In this paper, we have synthesized the cupric oxide functionalized carbon nanotube-reduced graphene oxide (CuO/CNTs-rGO) nanocomposites by a facile one-pot method. The obtained samples were characterized by transmission electron microscope (TEM), energy-dispersive spectroscopy (EDS), and X-ray powder diffraction (XRD) techniques. To investigate the electrochemical properties, the as-fabricated sensors were tested toward hydrazine detection by cyclic voltammetry (CV) and amperometry methods. The measured results demonstrate that the CuO/CNTs-rGO nanocomposites sensor shows a sensitivity of 4.28 mu A center dot mu M-1 center dot cm(-2), a linear range of 1.2-430 mu M, and detection limit of 0.2 mu M toward hydrazine. The enhanced electrocatalytic activity can be attributed to the catalytic properties of CuO and synergistic effect of the ternary nanocomposites. Meanwhile, the as-fabricated CuO/CNTs-rGO sensor also displays good selectivity and long-term stability, which implies its feasibility for practical application.