Silica template electrodeposition of copper oxide nanostructures on Ni foam as an ultrasensitive non-enzymatic glucose sensor

Abstract

Abstract Silica templated copper oxide nanostructures were prepared on Ni foam electrode and presented as an enzyme-free glucose sensor. X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and field emission scanning electron microscopy (FE-SEM) techniques were used to characterize the presented electrode. A good synergistic effect between Cu and Ni for glucose determination caused a high sensitivity of 5.45 mA/mM/cm2, the linear range up to 22.5 mM and low practical detection limit of 4.81 nM. The electrochemical properties of the proposed sensor such as electrochemical active surface area, diffusion coefficient, and catalytic rate constant of glucose electro-oxidation were reported. The presented sensor showed good long term stability and reproducibility. It has excellent selectivity and it was applied for accurate determination of glucose in the real serum samples.