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A buckypaper decorated with CoP/Co for nonenzymatic amperometric sensing of glucose

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Abstract

A freestanding and flexible buckypaper modfied with CoP/Co (CoP/Co-BP) is described. It has a sponge-like nanostructure and is shown to enable improved nonenzymatic sensing of glucose. The CoP/Co-BP was prepared by first depositing a uniform layer of ZIF- 67 crystals on BP, followed by two steps of pyrolysis treatment and phosphidation under an argon atmosphere. The morphology and structure of the material were characterized by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical properties were investigated by cyclic voltammetry and amperometric response. The amperometric sensor, best operated at 0.45 V (vs. SCE) at pH 13 has a linear range that extends from 0.5 μM to 1.8 mM of glucose, a 0.2 μM detection limit (at S/N = 3), and a sensitivity of 6427 μA mM−1 cm−2 in alkaline solution. This is mainly attributed to the synergistic effect between the highly active CoP nanostructure and BP which results in excellent conductivity. The uniformly distributed CoP nanoparticles in the network of BP prevent the formation of close-packed structure and facilitate electron transfer. The sensor has good selectivity and excellent long-term stability. It was applied to the determination of glucose in spiked human serum, and satisfactory results were obtained.

Schematic presentation of a freestanding and flexible buckypaper modfied with CoP/Co. It has a sponge-like nanostructure and exhibits improved catalytic activity toward glucose oxidation. This material was used for high-performance electrochemical glucose sensing.

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Acknowledgements

The authors thank the National Natural Science Foundation of China (No. 21505147), the Natural Science Foundation of Shandong (2018GGX102030), and the Taishan Scholar Program of Shandong Province (No. ts201511027).

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Correspondence to Chuantao Hou or Zonghua Wang.

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Hou, C., Zhang, X., Wang, L. et al. A buckypaper decorated with CoP/Co for nonenzymatic amperometric sensing of glucose. Microchim Acta 187, 101 (2020). https://doi.org/10.1007/s00604-019-4076-3

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Keywords

  • Pyrolysis treatment
  • Phosphidation
  • Electrocatalytic activity
  • Human serum
  • ZIF- 67
  • Sponge-like nanostructure
  • Synergistic effect
  • Excellent conductivity
  • Close-packed structure
  • Electron transfer