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<p>A&#xa0;kind of novel porous platinum nanoflowers (Pt NFs) was synthesized and assembled into acidified multiwalled carbon nanotubes (MWCNTs)-graphene quantum dots (GQDs) hybrid to form a ternary nanocomposite (Pt NFs/MWCNTs-GQDs), which was modified on surface of glassy carbon electrode (GCE). The morphology and structure of the nanocomposites were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), while the electrochemical behavior of epinephrine&#xa0;(EP) was investigated by means of cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The fabricated Pt NFs/MWCNTs-GQDs/GCE demonstrated excellent electrocatalytic activity toward EP oxidation, with a good linear relationship between the peak currents and the concentrations of EP in the range 0.100 to 800&#xa0;µM, and a detection limit of 14 nM (S/N = 3). In addition, the modified electrode presented good reproducibility, stability, and selectivity, which has been successfully used for determination of EP in medical injecta, as well as in porcine serum and urine samples with recoveries of 98.2% ~ 103.3% and 97.0% ~ 103.8%, respectively, showing that the proposed method is valuable in practical applications in medical analysis and disease diagnosis fields.</p> Graphical abstract <p></p>

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Sensitive and enzyme-free detection of epinephrine based on porous platinum nanoflowers assembling into multiwalled carbon nanotubes-graphene quantum dots hybrid modified electrode

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Haitao Liu,
  • Junyi He,
  • Yuqing Li,
  • Bin Li,
  • Jutao Zhou,
  • Bowen Wu,
  • Dan Li,
  • Lixian Sun,
  • Donghong Yu,
  • Zhong Cao

摘要

A kind of novel porous platinum nanoflowers (Pt NFs) was synthesized and assembled into acidified multiwalled carbon nanotubes (MWCNTs)-graphene quantum dots (GQDs) hybrid to form a ternary nanocomposite (Pt NFs/MWCNTs-GQDs), which was modified on surface of glassy carbon electrode (GCE). The morphology and structure of the nanocomposites were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), while the electrochemical behavior of epinephrine (EP) was investigated by means of cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The fabricated Pt NFs/MWCNTs-GQDs/GCE demonstrated excellent electrocatalytic activity toward EP oxidation, with a good linear relationship between the peak currents and the concentrations of EP in the range 0.100 to 800 µM, and a detection limit of 14 nM (S/N = 3). In addition, the modified electrode presented good reproducibility, stability, and selectivity, which has been successfully used for determination of EP in medical injecta, as well as in porcine serum and urine samples with recoveries of 98.2% ~ 103.3% and 97.0% ~ 103.8%, respectively, showing that the proposed method is valuable in practical applications in medical analysis and disease diagnosis fields.

Graphical abstract