Herein, a facile procedure was developed for designing an electrochemical sensor based on pencil graphite electrode modified with electrochemically synthesized silver and copper nanoparticles (AgNP and CuNP) supported on functionalized multiwalled carbon nanotubes (fMWCNTs). The electrochemical and morphological characterization was carried out by cyclic voltammetry, Electrochemical Impedance Spectroscopy, Powder X-ray diffraction, Field Emission Scanning Electron Microscopy, Transmission electron microscopy and Atomic Force Microscopy. The designed sensor exhibited electrocatalytic behavior towards the reduction of Imazethapyr. Results indicates the combination of AgNPs, CuNPs and fMWCNTs on PGE produced remarkable enhancement in electrocatalytic and sensing properties. Various electro-kinetic parameters like Rct, kapp, n, α, E0, k0, Γ, D and k have been evaluated by CV, impedance and Chronoamperometric studies. The electrochemical performance was improved by optimizing the effect of pH, scan rate, amount of fMWCNTs and deposition parameters of AgNP and CuNP. The sensor was efficaciously applied for determination of Imazethapyr and exhibited a linear correlation in the concentration range of 0.01–5.0 μg mL−1 with low detection limits, 0.159 ng mL−1 using AdSWV. The fabricated sensor exhibited good accuracy, acceptable stability and high efficacy for quantitative determination of Imazethapyr in real samples with notable recoveries ranging from 98 % to 100.2 %.

中文翻译：

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Cu和Ag纳米膜修饰的fMWCNT-铅笔石墨电极的设计及其对咪草烟的电催化行为

在此，开发了一种简便的程序来设计基于铅笔石墨电极的电化学传感器，该电极用电化学合成的银和铜纳米粒子（AgNP 和 CuNP）修饰，并支撑在功能化多壁碳纳米管（fMWCNT）上。通过循环伏安法、电化学阻抗谱、粉末 X 射线衍射、场发射扫描电子显微镜、透射电子显微镜和原子力显微镜进行电化学和形态表征。设计的传感器表现出对咪草烟还原的电催化行为。结果表明，AgNPs、CuNPs 和 fMWCNTs 在 PGE 上的组合显着提高了电催化和传感性能。各种电动参数，如 Rct、kapp、n、α、E0、k0、Γ、D 和 k 已通过 CV、阻抗和计时电流研究进行评估。通过优化pH值、扫描速率、fMWCNTs数量以及AgNP和CuNP沉积参数的影响，提高了电化学性能。该传感器有效地应用于咪唑乙烟酸的测定，并在 0.01–5.0 μg mL-1 的浓度范围内表现出线性相关性，使用 AdSWV 检测限为 0.159 ng mL-1。制造的传感器表现出良好的准确度、可接受的稳定性和高效的定量测定真实样品中咪草烟的效率，显着的回收率为 98% 至 100.2%。该传感器有效地应用于咪唑乙烟酸的测定，并在 0.01–5.0 μg mL-1 的浓度范围内表现出线性相关性，使用 AdSWV 检测限为 0.159 ng mL-1。制造的传感器表现出良好的准确度、可接受的稳定性和高效的定量测定真实样品中咪草烟的效率，显着的回收率为 98% 至 100.2%。该传感器有效地应用于咪唑乙烟酸的测定，并在 0.01–5.0 μg mL-1 的浓度范围内表现出线性相关性，使用 AdSWV 检测限为 0.159 ng mL-1。制造的传感器表现出良好的准确度、可接受的稳定性和高效的定量测定真实样品中咪草烟的效率，显着的回收率为 98% 至 100.2%。