Enhanced Luminol Chemiluminescence with Oxidase-like Activity of NiOOH/Ni(OH)2 Nanoflakes for the Sensitive Detection of Mn2+
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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. Mn 2+ 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 3-fold 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.
