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.

KEYWORDS:

• NiMn₂O₄ composite
• reduced graphene oxide
• nanosheets
• non-enzymatic sensor
• glucose

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Research Fund of JDXD R&D Institute [XDRD16001]; the Open Research Fund of the State Key Laboratory of Rail Traffic Control and Safety [RCS2017K006]; the Research Fund of the State Key Laboratory of Electrical Insulation and Power Equipment [EIPE14132]; and the Shaanxi Provincial Key Technologies R&D Programme [2016GY-001].