As an efficient and easily available pesticide, imidacloprid (IM) has been widely used in agriculture to kill pests. However, threats to the ecological environment are becoming increasingly prominent, caused by abuse and pesticide residues. This paper reports a sensitive electrochemiluminescence (ECL) sensor based on upconverting nanoparticle functional zeolite imidazolate framework (UCNPs@ZIF-8) nanocomposites combined with molecularly imprinted polymers (MIPs) to successfully achieve the quantitative detection of IM. The composites exhibited a certain multi-faceted prismatic structure and the effective binding of UCNPs was demonstrated by characterization technology. In addition, a sensor with MIPs/UCNPs@ZIF-8/GCE as the working electrode exhibited outstanding ECL performance, including a strong and stable signal and excellent selectivity under optimal conditions. This sensor showed a good linear response to IM over a wide concentration range (0.1 ng L⁻¹–1 mg L⁻¹), with a limit of detection as low as 0.01 ng L⁻¹. More significantly, it was successfully applied to the determination of IM concentration levels in food, which provides broad application prospects for the construction of pesticide ECL sensors.

中文翻译：

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基于分子印迹技术和 UCNPs@ZIF-8 纳米复合材料的新型电化学发光传感器用于灵敏测定吡虫啉

吡虫啉（IM）作为一种高效、易得的农药，已广泛用于农业杀虫。然而，滥用和农药残留对生态环境的威胁日益突出。本文报道了一种基于上转换纳米颗粒功能沸石咪唑酯骨架（UCNPs@ZIF-8）纳米复合材料与分子印迹聚合物（MIPs）相结合的灵敏电化学发光（ECL）传感器，成功实现了IM的定量检测。复合材料呈现出一定的多面棱柱结构，并通过表征技术证明了UCNPs的有效结合。此外，以 MIPs/UCNPs@ZIF-8/GCE 为工作电极的传感器表现出出色的 ECL 性能，包括在最佳条件下强大而稳定的信号和出色的选择性。该传感器在很宽的浓度范围（0.1 ng L^-1 –1 mg L ^-1 )，检测限低至 0.01 ng L ^-1。更重要的是，它成功应用于食品中IM浓度水平的测定，为农药ECL传感器的构建提供了广阔的应用前景。