Rapid synthesis of Cu2O/CuO/rGO with enhanced sensitivity for ascorbic acid biosensing

In this study, Cu 2 O/CuO/reduced graphene oxide (rGO) was synthesized through a rapid and convenient microwave-assisted hydrothermal method . The crystal structure and morphology of the as-prepared product were characterized using X-ray diffraction (XRD), field-emission-scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectroscopy , and X-ray photoelectron spectroscopy (XPS). The electrochemical performance of the novel Cu 2 O/CuO/rGO biosensor was investigated via cyclic voltammetry . The biosensor was evaluated for ascorbic acid (AA) detection and exhibited a wide linear range of 100 μM–1000 μM, a low detection limit of 0.301 μM, and a sensitivity of 1375.486 μA mM −1  cm −2 .