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Ultrathin and vertical NiCo 2 O 4  nanosheets were grown on nitrogen-doped reduced graphene oxide (NiCo 2 O 4  NSs@N-rGO) through a simple one-step co-precipitation procedure. The NiCo 2 O 4  NSs@N-rGO nanocomposites were investigated through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. And the performance of NiCo 2 O 4 NSs@N-rGO non-enzymatic glucose sensor was measured by cyclic voltammetry and amperometric method. The sensor exhibited two wide linear ranges of 0.01 mM-5.50 mM and 5.50 mM-15.50 mM with high sensitivity of 4372.9 μA·mM −1 cm −2  and 1686.1 μA·mM −1 cm −2 , which is much better than other Co-based and Ni-based glucose sensors. In addition, the non-enzymatic glucose sensor also shows strong anti-interference and durability. Besides, it is found that this non-enzymatic glucose sensor can accurately measure the blood glucose concentration in human serum, which provides a great possibility for future application in medical treatment.

materials technology

Highly sensitive electrochemical non-enzymatic glucose biosensor based on squamous NiCo 2 O 4  nanosheets decorated nitrogen-doped reduced graphene oxide