Qi Jiaqian, Chen Yang, Chen Jing, Chen Funan
School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
Mikrochim Acta. 2025 Jun 25;192(7):455. doi: 10.1007/s00604-025-07318-3.
Nickel hydroxide nanoflakes incorporating amorphous nickel oxyhydroxide (NiOOH/Ni(OH) NFs) were synthesized through a chemical oxidation approach. NiOOH/Ni(OH) NFs maintains the two-dimensional structure of Ni(OH) 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 significantly quenched the CL signal by scavenging ROS, enabling a linear detection range of 1 - 30 μmol·L and a detection limit of 0.60 μmol·L, which is threefold lower than the World Health Organization (WHO) permissible limit (1.80 μmol·L) 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.
通过化学氧化法合成了包含非晶态羟基氧化镍的氢氧化镍纳米片（NiOOH/Ni(OH) NFs）。NiOOH/Ni(OH) NFs保持了Ni(OH)纳米片的二维结构，比表面积增大。此外，非晶态NiOOH具有丰富的高价镍活性位点，赋予该材料显著的类氧化酶活性。这种催化特性使得能够从溶解氧中产生活性氧（ROS），在无需外部氧化剂的情况下将鲁米诺化学发光（CL）强度提高了2000多倍。锰通过清除ROS显著淬灭CL信号，实现了1 - 30 μmol·L的线性检测范围和0.60 μmol·L的检测限，该检测限比世界卫生组织（WHO）规定的饮用水允许限值（1.80 μmol·L）低三倍。该传感器已成功应用于自来水和湖水样品检测，具有操作简单、响应迅速和选择性高的特点，是一种很有前景的环境监测方法。
