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<p>This study synthesized and designed a unique porous nanotube structure CoO<sub>x</sub>@CNz nanozyme by controlling the calcination temperature and strong π–π interaction. When calcined at 300&#xa0;℃, the structure of CoO<sub>x</sub>@CNz nanotube did not decompose. Under calcination at 800&#xa0;℃, larger particle sizes appeared and agglomerated. During the pyrolysis process at 600&#xa0;℃, it was optimized to form a porous and loose structure with more active sites and appropriate Co<sup>3+</sup>/Co<sup>2+</sup> ratio. The CoO<sub>x</sub>@CNz<sub>600</sub> was exhibited high peroxidase like properties. In addition, the material also had catalase-like activity, which could degrade H<sub>2</sub>O<sub>2</sub> and generate bubbles. By utilizing the high peroxidase like properties, this study designed a colorimetric analysis, and also constructed a multifunctional intelligent sensing platform based on deep learning YOLO v8 algorithm assisted smartphones, which achieving convenient, real-time and in situ detection of epinephrine. Surprisingly, the linear range of epinephrine detection was as wide as 79–1000&#xa0;μM, with a detection limit of 70.59&#xa0;μM. The sensor was also used for the detection of epinephrine in newborn calf serum samples. This nanozyme had extremely high stability and reproducibility, and could be stored for more than 70&#xa0;days. This work not only provided a new approach for designing high nanozyme activity nanomaterials, but also further built a smartphone sensing platform.</p>

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High peroxidase-like activity of CoOx@CNz nanozymes for colorimetric and smartphone-based epinephrine sensing

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Yihua Xu,
  • Wenwen Xie,
  • Shaojuan Jiang,
  • Zhiwei Lu,
  • Gehong Su,
  • Chun Wu,
  • Hanbing Rao,
  • Mengmeng Sun,
  • Mingxia He

摘要

This study synthesized and designed a unique porous nanotube structure CoOx@CNz nanozyme by controlling the calcination temperature and strong π–π interaction. When calcined at 300 ℃, the structure of CoOx@CNz nanotube did not decompose. Under calcination at 800 ℃, larger particle sizes appeared and agglomerated. During the pyrolysis process at 600 ℃, it was optimized to form a porous and loose structure with more active sites and appropriate Co3+/Co2+ ratio. The CoOx@CNz600 was exhibited high peroxidase like properties. In addition, the material also had catalase-like activity, which could degrade H2O2 and generate bubbles. By utilizing the high peroxidase like properties, this study designed a colorimetric analysis, and also constructed a multifunctional intelligent sensing platform based on deep learning YOLO v8 algorithm assisted smartphones, which achieving convenient, real-time and in situ detection of epinephrine. Surprisingly, the linear range of epinephrine detection was as wide as 79–1000 μM, with a detection limit of 70.59 μM. The sensor was also used for the detection of epinephrine in newborn calf serum samples. This nanozyme had extremely high stability and reproducibility, and could be stored for more than 70 days. This work not only provided a new approach for designing high nanozyme activity nanomaterials, but also further built a smartphone sensing platform.