A novel electrochemiluminescence sensor using Lu-Au@Ni-MOF for ultra-sensitive detection of permethrin

Herein, we report a novel and highly sensitive electrochemiluminescence (ECL) sensor for the detection of permethrin (PT). This sensor is constructed based on a nanocomposite in which luminol-reduced gold nanoparticles (Lu-Au NPs) are anchored onto a nickel-based metal-organic framework (Ni-MOF). The nanocomposite (Lu-Au@Ni-MOF) possesses a three-dimensional porous and microflower-like architecture, offering an exceptionally high surface area that facilitates the immobilization of Lu-Au NPs, thereby maximizing the loading of the luminol emitter. The detection of PT is based on the quenching of the luminol ECL signal mediated by PT. Under the optimized conditions, the sensor exhibits a wide linear response for PT from 5.0 × 10^-9 to 5.0 × 10^-5 mol L^-1, with a remarkably low detection limit of 1.8 × 10^-10 mol L^-1. The practical reliability of the sensor was validated through the determination of PT in commercial pesticide formulations. This cost-effective and robust approach demonstrates significant potential for practical, on-site monitoring of pesticide pollutants.