中文摘要：

通过液相剥离法制备了一种新颖的二硫化钼-自掺杂聚苯胺（MoS_2-SPAN）纳米复合材料。在超声过程中,负电荷性的SPAN扩散、吸附并嵌插到同步获得的MoS_2薄层中,从而形成三维结构的复合材料。通过扫描电子显微镜、傅氏转换红外光谱和电化学法对MoS_2-SPAN复合材料进行表征。该纳米复合材料的有效表面积大、电化学活性位点多、稳定性较高。采用差分脉冲阳极溶出伏安法（DPASV）研究了铅离子在MoS_2-SPAN修饰玻碳电极（MoS_2-SPAN/GCE）上的电化学行为并优化了电化学检测条件。结果显示MoS_2-SPAN纳米复合材料在铅离子检测中呈现良好的导电性和吸附性。基于MoS_2-SPAN大的比表面积和协同效应,该MoS_2-SPAN/GCE可实现对铅离子的高灵敏检测,在0.1~10μg/L和10~100μg/L浓度范围内,铅离子的溶出峰电流与其浓度呈良好的线性关系,检出限（S/N=3）达2.87×10^-8g/L。该方法具有很好的重现性和较好的抗干扰能力,可应用于实际水样中铅离子的检测。

英文摘要：

A novel molybdenum disulfide - self-doped polyaniline （ MoS2 - SPAN） nanocomposite was successfully prepared by liquid exfoliation method. In the process of ultrasonication, the negatively charged SPAN diffused and intercalated in the MoS2 nanosheets to form a three dimensiona-structured nanocomposite, due to the strong π - π＊ stacking interaction and electrostatic repulsion. The as-pre- pared MoS2 -SPAN nanocomposite was characterized by scanning electron microscopy （SEM）, Fou- rier transform infrared spectroscopy （FTIR） and electrochemical method, which indicated that this nanocomposite had the advantages of a large effective area, a great deal of electroactive species and high stability. The electrochemical behavior of lead ions at MoS2 - SPAN nanocomposite modified glassy carbon electrode （ MoS2 - SPAN/GCE ） was investigated by differential pulse anodic stripping vohammetry （DPASV）, and the electrochemical detection conditions for lead ions were also opti- mized. The results showed that the MoSs - SPAN nanocomposite possessed good conductivity and ex- cellent adsorption performance for lead ions, and the MoS2 - SPAN/GCE could realize the highly sen- sitive electrochemical detection of lead ions due to the large surface area and the good synergistic effect of MoS2 -SPAN nanocomposite. Both, the MoS2 -SPAN/GCE exhibited good hnear relation- ships between peak currents and concentrations of Pb2＋ in the ranges of 0. 1 -10 μg/L and 10- 100 μg/L, and the limit of detection （ S/N = 3 ） was 2. 87 x 10 -5 g/L. Besides, this electrochemical method based on MoS2 -SPAN nanocomposite had an excellent repeatability and a good anti-interfer- ence ability, and it could be applied in the determination of lead in actual water sample.