A 3D-graphene fiber electrode embedded with nitrogen-rich-carbon-coated ZIF-67 for the ultrasensitive detection of adrenaline

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Abstract
A novel nitrogen-rich-carbon-coated ZIF-67 embedded three-dimensional-graphene (ZIF-67/NC/3DG) fiber was fabricated via a facile one-pot electrodeposition self-assembly method, and used as a prominent electrode for the non-enzymatic detection of adrenaline (Ad). In this design, the prepared ZIF-67 adsorbs Ad through hydrogen bonding and electrostatic interaction, while polypyrrole functions as the precursor of the conductive NC that seamlessly connects ZIF-67 with the 3DG fiber electrode to ameliorate the poor conductivity of the ZIF-67 moiety and thus improve the sensitivity of the ZIF-67/NC/3DG fiber electrode for detecting Ad. The constructed fiber sensor shows a double linear response over the Ad concentration range of 0.06–95 μM with a high sensitivity of 44.6 mA mM−1 cm−2 and 95.0–5900 μM with a good sensitivity of 11.0 mA mM−1 cm−2, giving a low detection limit of 0.02 μM and excellent repeatability. The ZIF-67/NC/3DG fiber electrode was further successfully applied for the determination of Ad in a real sample of human serum, indicating that this fiber electrode is a promising miniaturized sensor for electrochemical analysis.
Funding Information
  • Natural Science Foundation of Beijing Municipality (2184122)
  • National Natural Science Foundation of China (21575014, 21905025)
  • State Key Laboratory of Explosion Science and Technology (YBKT18-03)
  • Fundamental Research Funds for the Central Universities (2018CX01017)
  • Beijing Institute of Technology Research Fund Program for Young Scholars

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