Fabrication of NiMn₂O₄ nanosheets on reduced graphene oxide for non-enzymatic detection of glucose

Abstract

A distinctive hierarchical hybrid nanostructure which consists of the ultrathin and vertical NiMn2O4 nanosheets grown on reduced graphene oxide (NiMn2O4 NSs@rGO) is synthesised as a non-enzyme glucose sensor by a simple co-precipitation and hydrothermal procedure. The structures and morphologies of the NiMn2O4 NSs@rGO nanocomposites are investigated through X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry and amperometry measurement are applied to analyse the glucose sensing characteristics of NiMn2O4 NSs@rGO. The obtained NiMn2O4 NSs@rGO sensor exhibits two wide linear ranges of 0.001 mM-1 mM and 1 mM-3.5 mM with high sensitivity of 2615.2μAmM−1 cm−2 and 294.8μAmM−1 cm−2, which is much better than other Ni-based and Mn-based glucose sensors. In addition, the NiMn2O4 NSs@rGO nanocomposites have excellent anti-interference and stability. Moreover, the constructed sensor is viable in the analysis of real serum samples, which makes it become a medically dependable non-enzymatic glucose sensor with great possibility.