Due to its deleterious effects on health, development of new methods for detection and removal of pesticide residues in primary and derived agricultural products is a research topic of great importance. Among them, imazalil (IMZ) is a widely used post‐harvest fungicide with good performances in general, and is particularly applied to prevent green mold in citrus fruits. In this work, a composite film for the impedimetric sensing of IMZ built from metal‐organic framework nanocrystallites homogeneously distributed on a conductive poly(3,4‐ethylene dioxythiophene) (PEDOT) layer is presented. The as‐synthetized thin films are produced via spin‐coating over poly(ethylene terephtalate (PET) substrate following a straightforward, cost‐effective, single‐step procedure. By means of impedance spectroscopy, electric transport properties of the films are studied, and high sensitivity towards IMZ concentration in the range of 15 ppb to 1 ppm is demonstrated (featuring 1.6 and 4.2 ppb limit of detection, when using signal modulus and phase, respectively). The sensing platform hereby presented could be used for the construction of portable, miniaturized, and ultrasensitive devices, suitable for pesticide detection in food, wastewater effluents, or the assessment of drinking‐water quality.

中文翻译：

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用于阻抗式农药传感器的 MOF@PEDOT 复合薄膜。

由于其对健康的有害影响，开发检测和去除初级农产品和衍生农产品中农药残留的新方法是一个非常重要的研究课题。其中抑霉唑（IMZ）是一种广泛使用的采后杀菌剂，总体性能良好，特别适用于防治柑橘类水果青霉病。在这项工作中，提出了一种用于 IMZ 阻抗传感的复合薄膜，该复合薄膜由均匀分布在导电聚（3,4-乙烯二氧噻吩）（PEDOT）层上的金属有机骨架纳米晶制成。合成后的薄膜是通过在聚对苯二甲酸乙二醇酯 (PET) 基底上旋涂，按照简单、经济高效的单步程序生产的。通过阻抗谱，研究了薄膜的电传输特性，并证明了对 15 ppb 至 1 ppm 范围内的 IMZ 浓度具有高灵敏度（当使用信号模量和相位时，检测限分别为 1.6 和 4.2 ppb）。特此提出的传感平台可用于构建便携式、微型超灵敏设备，适用于食品、废水中的农药检测或饮用水质量评估。