Non-enzymatic glucose sensor based on a g-CN/NiO/CuO nanocomposite.

In this paper, a non-enzymatic glucose sensor was developed based on a g-CN/NiO/CuO nanocomposite immobilized on a glassy carbon electrode (GCE). Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) were utilized for the characterization of the synthesized g-CN/NiO/CuO nanocomposite. The electrocatalytic activity of the nanocomposite was investigated by cyclic voltammetry, and the amperometric technique was applied for monitoring glucose. The g-CN/NiO/CuO/GCE exhibited better electrocatalytic performance than g-CN/GCE, g-CN/CuO/GCE and g-CN/NiO/GCE. Under optimized conditions, the proposed sensor offered a linearity ranging from 0.4 μM to 8.5 mM with a detection limit of 0.1 μM and a sensitivity of 362.12 μA mM cm. The constructed sensor displayed favorable reproducibility, outstanding selectivity, and long-term performance. These results reveal that the sensor is a promising candidate for blood glucose sensing.