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Description:

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 the 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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: PAH metabolites, Electrochemical sensing, bimetallic metal organic framework, environmental biomonitoring

Date published: 2026-05-12

Publisher: Springer Science and Business Media LLC

Journal:

• Communications Materials (ISSN: 26624443) vol. 7 issue. 1 195

Funding:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP1224NM5002

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s43246-026-01150-9

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Updated at: 2026-07-23 11:52:39 +0900

Published on MDR: 2026-07-24 12:28:54 +0900