通过一步电沉积技术在玻碳电极表面构建了石墨烯-纳米金复合材料。将该复合材料与铋膜相结合，采用阳极溶出伏安法实现了对Pb(II)的检测。通过SEM对制备的石墨烯-纳米金复合材料进行了微观结构表征。拉曼光谱及电化学研究表明，石墨烯-纳米金复合材料具有良好的导电性和大的比表面积，修饰电极的电化学信号得到较明显增强，同时促进了铋膜预富集铅的能力，对Pb(II)检测灵敏度高，检测范围宽。在最佳实验条件下，其对Pb(II)浓度的定量测定线性范围为1~220μg⋅L-1，R=0.9987，检出限为0.1μg⋅L-1(S/N=3)。实际样品中铅的测定结果表明，该方法简便、可靠，具有实际应用价值。%Graphene-Aunano (GR-Aunano) nanocomposites were prepared by a one-step deposition method. Trace Pb(II) detection was realized by using anodic stripping voltammetry combining GR-Aunano nanocomposites with Bi films. The morphology of the GR-Aunano nanocomposite was investigated by SEM. Raman spectra and electrochemical results indicate that the GR-Aunano modified electrode shows better electrochemical signal and can enhance the metal ion pre-concentrating ability of Bi films, which is due to high conductivity and large surface area of the GR-Aunano nanocomposite. Under the optimal condition, the sensor exhibits a linear detection of Pb(II) from 1 μg·L-1 to 220 μg·L-1 with correlation coefficient of 0.9987. The detection limit is 0.1 μg·L-1 with a signal to noise ratio of 3 (S/N= 3). Furthermore, the GR-Aunano modified electrode displays rapid response, high stability, good reproducibility and high sensitivity for Pb(II) detection in real application.
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