In this research, a sensitive and selective electrochemical sensor based on bimetallic gold (Au) and palladium (Pd) nanoparticles coated on mixture of reduced graphene oxide (rGO) and multiwall carbon nanotube (MWCNTs) nanocomposite was constructed by using glassy carbon electrode which has been developed for determination of an organophosphorus (OPs) insecticide, Diazinon. Au–Pd/rGO–MWCNTs was synthesized by chemical reduction method, and the final product was investigated by transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. Under optimized conditions, the proposed sensor showed that the stripping oxidation peak current of Diazinon was linearly proportional to its concentrations in an appropriate range of 0.009 to 11.3 µM with a limit of detection and limit of quantification of 0.002 and 0.009 µM, respectively. The selectivity and reproducibility of the proposed sensor were checked, and the results showed that these factors of the sensor were in high level. Finally, the Au–Pd/rGO–MWCNTs/GCE was successfully used for measurement of target analyte in water, apple and cucumber samples recoveries ranging from 96 to 105%.

中文翻译：

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基于Au–Pd / rGO–MWCNTs复合材料的灵敏且选择性的电化学测定二嗪农：在水，水果和蔬菜样品中的分析应用

本研究利用玻璃碳电极构建了基于选择性氧化石墨烯（rGO）和多壁碳纳米管（MWCNTs）纳米复合材料混合物的双金属金（Au）和钯（Pd）纳米颗粒的灵敏选择性电化学传感器。开发用于测定有机磷（OPs）杀虫剂二嗪农的方法。通过化学还原法合成了Au-Pd / rGO-MWCNTs，并通过透射电子显微镜，X射线衍射，傅立叶变换红外光谱和能量色散X射线光谱研究了最终产物。在最佳条件下，所建议的传感器显示，二嗪农的汽提氧化峰值电流与其浓度在0.009至11的适当范围内成线性比例。3 µM，检出限和定量限分别为0.002和0.009 µM。检查了所提出传感器的选择性和可重复性，结果表明这些因素在高水平。最后，Au–Pd / rGO–MWCNTs / GCE成功地用于测量水中，苹果和黄瓜样品中目标分析物的回收率，范围从96％到105％。