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<p>Polycyclic aromatic hydrocarbons are hazardous, carcinogenic pollutants produced by the incomplete combustion of organic materials, and their detection remains a technological challenge. Here, we develop bimetallic cobalt-and-copper-based zeolitic imidazolate framework (CoCu-ZIF) particles coupled with carbon black (CB)&#xa0;for highly sensitive and selective electrochemical sensing of 2-Naphthol, a monohydroxylated polycyclic aromatic hydrocarbon. The CoCu-ZIF with dual redox-active sites of Co<sup>3+</sup>/Co<sup>2+</sup> and Cu<sup>2+</sup>/Cu<sup>+</sup> promotes efficient electron transfer during the oxidation process, thus effectively catalyzing the oxidation of 2-Naphthol. Carbon black provides a conductive network facilitating efficient electron transport between CoCu-ZIF and electrode surface. The fabricated sensors exhibit a sensitivity and limit of detection of 0.98 µA µM⁻¹ and 0.46 µM, respectively, during exposure to 2-Naphthol within a detection range of 1–500 µM. Moreover, due to their excellent sensing performance, selectivity, reproducibility, and recovery rate in non-biological urine, the developed composites offer strong potential for real-time polycyclic aromatic hydrocarbon monitoring and future use in environmental sensor technologies.</p><p></p>

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Carbon-black-coupled bimetallic CoCu-ZIF composites for monohydroxylated polycyclic aromatic hydrocarbon metabolite sensing

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月12日

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  • Chandra Wulandari,
  • Atqiya Muslihati,
  • Ni Luh Wulan Septiani,
  • Ahmad Nuruddin,
  • Brian Yuliarto,
  • Yusuke Yamauchi,
  • Joel Henzie,
  • Erwin Peiner,
  • Hutomo Suryo Wasisto,
  • Nugraha Nugraha

摘要

Polycyclic aromatic hydrocarbons are hazardous, carcinogenic pollutants produced by the incomplete combustion of organic materials, and their detection remains a technological challenge. Here, we develop bimetallic cobalt-and-copper-based zeolitic imidazolate framework (CoCu-ZIF) particles coupled with carbon black (CB) for highly sensitive and selective electrochemical sensing of 2-Naphthol, a monohydroxylated polycyclic aromatic hydrocarbon. The CoCu-ZIF with dual redox-active sites of Co3+/Co2+ and Cu2+/Cu+ promotes efficient electron transfer during the oxidation process, thus effectively catalyzing the oxidation of 2-Naphthol. Carbon black provides a conductive network facilitating efficient electron transport between CoCu-ZIF and electrode surface. The fabricated sensors exhibit a sensitivity and limit of detection of 0.98 µA µM⁻¹ and 0.46 µM, respectively, during exposure to 2-Naphthol within a detection range of 1–500 µM. Moreover, due to their excellent sensing performance, selectivity, reproducibility, and recovery rate in non-biological urine, the developed composites offer strong potential for real-time polycyclic aromatic hydrocarbon monitoring and future use in environmental sensor technologies.