Nonenzymatic glucose sensor based on Cu–Cu2S nanocomposite electrode

Cu2S nanoplates (named Cu2S NPs) were synthesized on the Cu substrate by a simple etching method. The morphology and structure of Cu2S NPs were characterized by scanning electron microscopy and X-ray diffraction. Then the Cu–Cu2S composites were directly used as electrode to nonenzymatic detect glucose. The electrochemical study has demonstrated that the Cu–Cu2S electrode shows a perfect catalytic effect on the glucose due to the large surface area of Cu2S nanoplates and high electric conductivity of Cu rod. At an applied potential of − 0.10 V, the sensor produces an ultra high sensitivity of 361.58 μA mM− 1 with a low detection limit of 0.1 μM (S/N = 3). What's more, the proposed sensor displays excellent selectivity, good stability, and satisfying repeatability.