Abstract

A novel molecularly imprinted electrochemical sensor is presented based on one-dimensional ultrathin manganese oxide nanowires/two-dimensional molybdenum titanium carbide MXene (MnO₂NWs@Mo₂TiC₂ MXene) for fenitrothion (FEN) determination. After the synthesis of MnO₂NWs@Mo₂TiC₂ MXene ionic nanocomposite was successfully completed with a facile hydrothermal and the pillaring methods, a new type molecular imprinted electrochemical sensor based on MnO₂NWs@Mo₂TiC₂ MXene was constructed with cyclic voltammetry (CV) polymerization including pyrrole monomer and FEN target molecule. After the characterization studies including spectroscopic, electrochemical and microscopic methods, the analytical applications of the prepared sensor were performed. A linearity of 1.0×10⁻⁹–2.0×10⁻⁸ mol L⁻¹ was obtained and the values of the quantification limit (LOQ) and the detection limit (LOD) were 1.0×10⁻⁹ mol L⁻¹ and 3.0×10⁻¹⁰ mol L⁻¹, respectively. The studies of selectivity, stability and reproducibility of the constructed sensor based on MnO₂NWs@Mo₂TiC₂ nanocomposite and molecularly imprinting polymer (MIP) were carried out in detail. Finally, the developed sensor was applied to white flour samples with the values close to 100%.

Graphical Abstract

中文翻译：

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基于超薄氧化锰纳米线/碳化钼钛MXene离子纳米复合材料和分子印迹聚合物电化学测定杀螟松农药

摘要

提出了一种基于一维超薄氧化锰纳米线/二维碳化钼钛MXene（MnO ₂ NWs@Mo ₂ TiC ₂ MXene）的新型分子印迹电化学传感器，用于杀螟硫磷（FEN）的测定。通过简单的水热和柱化方法成功合成了MnO ₂ NWs@Mo ₂ TiC ₂ MXene离子纳米复合材料后，利用循环伏安法构建了一种基于MnO ₂ NWs@Mo ₂ TiC ₂ MXene的新型分子印迹电化学传感器(CV)聚合包括吡咯单体和FEN目标分子。经过光谱、电化学和显微方法等表征研究后，对所制备的传感器进行了分析应用。线性关系为1.0×10 ^-9 –2.0×10 ^-8 mol L ^-1，定量限（LOQ）和检测限（LOD）分别为1.0×10 ^-9 mol L ^-1和3.0×分别为10 ^-10 mol L ^-1。对基于MnO ₂ NWs@Mo ₂ TiC ₂纳米复合材料和分子印迹聚合物（MIP）构建的传感器的选择性、稳定性和重现性进行了详细的研究。最后，将开发的传感器应用于白面粉样品，其值接近100%。

图形概要