Production of Ni7S6/NiO hybrids as a highly sensitive amperometric sensor for glucose

In this paper, NiO, Ni 7 S 6 , and different proportions of Ni 7 S 6 /NiO hybrids were synthesized by solvothermal method. The crystal structure, valence, and morphology of the prepared samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. Electrochemical performance of the prepared materials was tested by a series of electrochemical methods. And, the results showed that the electrochemical properties of Ni 7 S 6 /NiO composites were superior to those of Ni 7 S 6 and NiO, which may be due to the synergistic effect between Ni 7 S 6 and NiO. Furthermore, Ni 7 S 6 /NiO-30% shows the best electrochemical properties among the prepared samples. The electrochemical sensor based on the Ni 7 S 6 /NiO-30% has good electrocatalytic behavior for glucose oxidation, with a wide linear range from 0.09 to 3.12 mM, low detection limit (0.3 μM), long-term stability, and considerable reproducibility. Furthermore, it has good selectivity and could be used in human serum samples. Thus, this novel non-enzyme sensor has potential application in glucose detection.