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Enhanced amperometric sensing using a NiCo2O4/nitrogen-doped reduced graphene oxide/ionic liquid ternary composite for enzyme-free detection of glucose

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Abstract

In our work, a NiCo2O4/nitrogen-doped reduced graphene oxide/ionic liquid (NiCo2O4/N-rGO/IL) nanocomposite was prepared using hydrothermal treatment and calcination followed by a facile reaction with stirring. The composite material was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), FTIR spectra and thermogravimetric analysis (TGA). The biosensing properties of NiCo2O4/N-rGO/IL, NiCo2O4/N-rGO and NiCo2O4 towards glucose were studied based on a glassy carbon electrode. The NiCo2O4/N-rGO/IL nanocomposite exhibits excellent electrocatalytic activity towards glucose, with a sensitivity of 3.76 mA mM−1 cm−2 and a good linear response from 0.001 mM to 4.555 mM at a potential of +0.5 V. The limit of detection can reach 0.18 μM. It also shows significant electrochemical sensitivity, reproducibility and long-term stability. The good electrocatalytic activity is attributed to the synergistic effect of the metal oxides, graphene oxide and the IL. The N-doping of rGO accelerates the electron transfer of the IL further and enhances its electrochemical properties. In addition, the sensor is effectively applied to the determination of glucose in a human blood serum sample.

Graphical abstract: Enhanced amperometric sensing using a NiCo2O4/nitrogen-doped reduced graphene oxide/ionic liquid ternary composite for enzyme-free detection of glucose

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Publication details

The article was received on 07 Jan 2017, accepted on 31 Mar 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7NJ00077D
Citation: New J. Chem., 2017, Advance Article
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    Enhanced amperometric sensing using a NiCo2O4/nitrogen-doped reduced graphene oxide/ionic liquid ternary composite for enzyme-free detection of glucose

    H. Rao, Z. Zhang, H. Ge, X. Liu, P. Zou, X. Wang and Y. Wang, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ00077D

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