新疆大学自治区级大学生创新训练计划、中国国家自然科学基金(No. 21865034, No.21764014)
the Innovation Training Program of Xinjiang Autonomous Region University Students and the National Natural Science Foundation of China (No.21865034, No.21764014)
本文采用原位氧化聚合法制备巯基功能化的聚(3-4乙撑二氧噻吩)与多壁碳纳米管复合物（PEDOT-CH2SH/MWCNTs），通过改变碳纳米管在复合物中的含量获得最佳比例的复合物，并将其作为电活性材料对重金属离子Cd2+和Pb2+的浓度分别进行了单独检测和同时检测。采用扫描电子显微镜(SEM)、X-射线衍射(XRD)、傅立叶转换红外线光谱(FT-IR)和X射线光电子能谱（XPS）等手段对各复合物进行结构表征，用电化学差示脉冲伏安法（DPV）进行电化学测试，系统地探讨了结构和电化学性能之间的关系。结果表明，PEDOT-MeSH/15% MWCNTs的复合物表现出较均匀的多孔状形貌，并增强了对重金属离子Cd2+ 和Pb2+ 的灵敏度、选择性和检测稳定性。用PEDOT-MeSH/15% MWCNTs 复合物单独检测时Cd2+和Pb2+的线性范围为2~40 μM和6~40μΜ，最低检出限（LOD）分别为2 μM和6 μM。进行同时检测时，Cd2+和Pb2+的线性范围为8~40μΜ和6~40μΜ，最低检出限（LOD）分别为6 μM和2 μM，复合材料表现出较好的响应度和较低的检出限。干扰研究表明 PEDOT-MeSH/15% MWCNTs 复合电极具有低相互干扰性和高选择性。
In this paper, mercapto-functionalized poly (3-4 ethylenedioxythiophene) and multi-walled carbon nanotubes (PEDOT-CH2SH/MWCNTs) were prepared by in-situ oxidative polymerization, and the optimum ratio of the composite was obtained by changing the content of carbon nanotubes in the composite. The concentrations of heavy metal ions Cd2+ and Pb2+ were detected separately and simultaneously as electroactive materials. SEM, XRD, FT-IR and XPS were used to characterize the structure of each composite, and electrochemical differential pulse voltammetry (DPV) was used to conduct electrochemical tests. The relationship between structure and electrochemical properties was systematically discussed. The results showed that the PEDOT-MeSH/15% MWCNTs composite showed uniform porous morphology, and enhanced the sensitivity, selectivity and detection stability of heavy metal ions Cd2+ and Pb2+. When the PEDOT-MeSH/15% MWCNTs is used to detect Cd2+ and Pb2+ separately, the linear ranges are 2~40 μM and 6~40μM, and the LOD is 2 μM and 6 μM respectively. When Cd2+ and Pb2+ were detected simultaneously, the linear range was 8~40 μM and 6~40 μM, and the LOD was 6 μM and 2 μM, respectively. The composite showed good responsiveness and low detection limit. The research shows that PEDOT-MeSH/15% MWCNTs composite electrode has low mutual interference and high selectivity.