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制备了一种核壳结构的磁性纳米粒子Fe_3O_4@Ag,将该纳米粒子通过壳聚糖(CS)修饰到玻碳电极(GCE)表面,构建了杀螟硫磷电化学传感器,研究了传感器的电化学和电催化行为,建立了杀螟硫磷测定的电分析新方法。应用透射电镜和紫外可见光谱对Fe3O4@Ag纳米粒子进行表征。研究发现,该传感器对杀螟硫磷有很好的电催化作用,其峰电流与浓度在1.74×10~(-7)~3.27×10~(-4)mol/L范围内呈线性关系,相关系数为R~2=0.9871,检出限为5.7×10~(-8)mol/L(S/N=3)。该传感器有望用于杀螟硫磷的检测。
A magnetic core-shell magnetic nanoparticle Fe_3O_4 @ Ag was prepared. The nanoparticles were modified by chitosan (CS) onto the surface of glassy carbon electrode (GCE), and the fenitrothion electrochemical sensor was constructed. Electrochemical and electrocatalytic behavior of the determination of fenitrothion determination of the new method of electrical analysis. The Fe3O4 @ Ag nanoparticles were characterized by transmission electron microscopy and UV-vis spectroscopy. The results show that the sensor has good electrocatalytic activity against fenitrothion, and the peak current has a linear relationship with the concentration ranging from 1.74 × 10 -7 to 3.27 × 10 -4 mol / L. The correlation coefficient was R ~ 2 = 0.9871 with a detection limit of 5.7 × 10 ~ (-8) mol / L (S / N = 3). The sensor is expected to be used for fenitrothion detection.