One-step rapid preparation of CuO nanosheets by high frequency induction heating and the application as excellent electrochemical sensor based on CuO/MWCNTs for the detection of glucose

In this study, to improve production efficiency, a simple and rapid synthesis method of copper oxide (CuO) nanosheets by using high frequency induction heating was proposed. The CuO nanosheets were successfully prepared, and formulated into CuO and CuO/Multi-walled carbon nanotube (MWCNTs) electronic ink. After characterizing of the morphology, composition and structure of the as-prepared CuO nanosheets, the non-enzymatic glucose sensors by using CuO nanosheets and CuO/MWCNTs as functional materials were fabricated by dispensing on screen printed graphite electrodes (SPGE). For the detection of glucose, the electrochemical properties of the fabricated electrochemical sensor were evaluated by cyclic voltammetry (CV) and chronoamperometry. The results showed that the prepared electrochemical glucose sensor by CuO and CuO/MWCNTs all exhibited excellent sensitivity (1290 μAmM^-1cm^-2, 1890 μAmM^-1cm^-2), wide linear range (4-400 μM), and low detection limit (0.21 μM, 0.14 μM), high selectivity to common interference in physiological fluids, high stability and excellent feasibility for actual sample analysis. Between them, the electrochemical properties of the sensor prepared from CuO/MWCNTs are better due to the excellent electronic conductivity of MWCNTs.