GO/PPy/Pb_3O_4修饰电极的制备及其在电化学传感中的应用

Preparation of the GO/PPy/Pb_3O_4 modified electrode for electrochemical sensing application

通过制备氧化石墨烯/聚吡咯/四氧化三铅(GO/PPy/Pb_3O_4)复合材料,用于构建电化学传感器,以实现对对苯二酚的电化学检测。通过利用π-π共轭效应,实现吡咯单体在氧化石墨烯表面的原位聚合。以GO/PPy纳米复合材料为基底,通过水热反应制备得到具有微/纳结构的GO/PPy/Pb_3O_4复合材料。以扫描电镜(SEM),傅里叶红外(FTIR)和X射线衍射(XRD)等对复合材料进行表征,用差分脉冲伏安法研究对苯二酚在修饰电极上的电化学行为。通过对比不同修饰电极的电化学传感性能,发现GO/PPy/Pb_3O_4修饰电极展示了良好的导电性和优异的电催化性能。结果表明,该电化学传感器在1.0~35μg/L范围内与其氧化峰电流呈良好的线性关系,其检测限为0.3μg/L。此外,该电化学传感器还具有良好的重现性和稳定性。

This paper reported the preparation of an electrochemical hydroquinone sensor based on synthesized GO/PPy/ Pb3O4 composites. Pyrrole monomer was in situ chemical polymerization on the surface of the graphene oxide by the π-πconjugation effect. Based on the GO/PPy nanocomposites, GO/PPy/Pb3 O4 composites were fabricated by hydro- thermal method. The structural features of the fabricated composites were confirmed by scanning electron microscopy （SEM）, Fourier infrared （FTIR） and X-ray diffraction （XRD） characterization. The hydroquinone was studied with differential pulse voltammetry in the electrochemical behavior of the modified electrodes. Comparing different modified electrodes, the GO/PPy/Pb3O4 modified electrode showed good electrical conductivity and excellent electro-catalytic performance. The results showed that the electrochemical sensor had a good linear relationship between the hydroqui- none concentrations and electrochemical peak currents in the range of 1.0-35 μg/L, the detection limit is 0. 3 μg/L. In addition, the electrochemical sensor has good reproducibility and stability.