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<p>Nickel hydroxide nanoflakes incorporating amorphous nickel oxyhydroxide (NiOOH/Ni(OH)<sub>2</sub> NFs) were synthesized through a chemical oxidation approach. NiOOH/Ni(OH)<sub>2</sub> NFs maintains the two-dimensional structure of Ni(OH)<sub>2</sub> nanoflakes with an enlarged specific surface area. Furthermore, the amorphous NiOOH possesses abundant high-valence nickel active sites, endowing the material with remarkable oxidase-like activity. This catalytic property enabled the generation of reactive oxygen species (ROS) from dissolved oxygen, enhancing the luminol chemiluminescence (CL) intensity by over 2,000-fold without requiring external oxidants. Mn<sup>2+</sup> significantly quenched the CL signal by scavenging ROS, enabling a linear detection range of 1 − 30&#xa0;μmol·L<sup>−1</sup> and a detection limit of 0.60&#xa0;μmol·L<sup>−1</sup>, which is threefold lower than the World Health Organization (WHO) permissible limit (1.80&#xa0;μmol·L<sup>−1</sup>) for drinking water. The sensor was successfully applied to tap and lake water samples, demonstrating simplicity, rapid response, and high selectivity, making it a promising method for environmental monitoring.</p> Graphical Abstract <p></p>

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Enhanced luminol chemiluminescence with oxidase-like activity of NiOOH/Ni(OH)2 nanoflakes for the sensitive detection of Mn2+

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Jiaqian Qi,
  • Yang Chen,
  • Jing Chen,
  • Funan Chen

摘要

Nickel hydroxide nanoflakes incorporating amorphous nickel oxyhydroxide (NiOOH/Ni(OH)2 NFs) were synthesized through a chemical oxidation approach. NiOOH/Ni(OH)2 NFs maintains the two-dimensional structure of Ni(OH)2 nanoflakes with an enlarged specific surface area. Furthermore, the amorphous NiOOH possesses abundant high-valence nickel active sites, endowing the material with remarkable oxidase-like activity. This catalytic property enabled the generation of reactive oxygen species (ROS) from dissolved oxygen, enhancing the luminol chemiluminescence (CL) intensity by over 2,000-fold without requiring external oxidants. Mn2+ significantly quenched the CL signal by scavenging ROS, enabling a linear detection range of 1 − 30 μmol·L−1 and a detection limit of 0.60 μmol·L−1, which is threefold lower than the World Health Organization (WHO) permissible limit (1.80 μmol·L−1) for drinking water. The sensor was successfully applied to tap and lake water samples, demonstrating simplicity, rapid response, and high selectivity, making it a promising method for environmental monitoring.

Graphical Abstract