Abstract
A disposable needle-type of hybrid electrode was prepared from a core of stainless steel needle whose surface was modified with a 3D nanoporous gold/NiCo2O4 nanowall hybrid structure for electrochemical non-enzymatic glucose detection. This hybrid electrode, best operated at 0.45 V (vs. SCE) in solutions of pH 13 has a linear response in the 0.01 to 21 mM glucose concentration range, a response time of <1 s, and a 1 μM detection limit (at an S/N ratio of 3). The remarkable enhancement compared to the solid gold/NiCo2O4 and stainless steel/NiCo2O4 hybrid electrodes in electrochemical performance is assumed to originate from the good electrical conductivity and large surface area of the hybrid electrode, which enhance the transport of mass and charge during electrochemical reactions. This biosensor was also applied to real sample analysis with little interferences. The electrode is disposable and considered to be a promising tool for non-enzymatic sensing of glucose in a variety of practical situations.
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Acknowledgements
This work was financially supported by the National Key Research and Development Program of China (2016YFA0200400), the Natural Science Foundation of China (51571100, 21275064, 51602305), the Fundamental Research Funds for the Central Universities, and the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-09).
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Li, W., Qi, H., Wang, B. et al. Ultrathin NiCo2O4 nanowalls supported on a 3D nanoporous gold coated needle for non-enzymatic amperometric sensing of glucose. Microchim Acta 185, 124 (2018). https://doi.org/10.1007/s00604-017-2663-8
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DOI: https://doi.org/10.1007/s00604-017-2663-8