石墨炔/金纳米复合物构建的甲基对硫磷电化学传感器性能研究

STUDY ON PERFORMANCE OF METHYL PARATHION ELECTROCHEMICAL SENSOR BASED ON GRAPHDIYNE/GOLD NANOCOMPOSITE

利用化学还原法快速合成了一种新型三维结构的石墨炔/金纳米复合物材料,并用该材料修饰玻碳电极制备了非酶促甲基对硫磷电化学传感器,采用透射电子显微镜和能谱仪对材料的微形貌和元素组成进行了表征,采用循环伏安法和阻抗法对传感器的电化学性质进行了研究。结果表明:该复合材料具有疏松多孔的结构,能够有效地增大电极的比表面积;传感器在5μg/mL至0.32 mg/mL范围内具有良好的线性关系,最低检出限为1.8μg/mL,该传感器适用于甲基对硫磷的残留检测。

A novel three-dimensional graphdiyne/gold nanocomposite was rapidly synthesized by chemical reduction method.This composite material has a porous structure,which can effectively increase the specific surface area of the electrode.A non-enzymatic methyl parathion electrochemical sensor with high sensitivity,low detection limit and wide linear range was prepared by modifying the glassy carbon electrode with this material.The microscopic morphology and element composition of the material were respectively characterized by transmission electron microscopy and energy dispersive spectroscopy.The electrochemical performance of the sensor was investigated by cyclic voltammetry and impedance spectroscopy.Under the optimal conditions,the experimental results show that it has a good linear relationship in the range of 5μg/mL-0.32 mg/mL,the minimum detection limit is 1.8μg/mL,and the sensor has good sensitivity,stability,reproducibility and recovery of actual samples.The modified electrode is suitable for the determination of methyl parathion residues.