石墨烯—聚吡咯复合材料的制备及其热电性能研究

发布时间：2018-05-26 11:35

本文选题：热电材料 + 聚吡咯　；参考：《青岛科技大学》2015年硕士论文

【摘要】：与无机热电材料相比,有机热电材料具有柔性、可加工性、低导热和低成本等优点,但目前文献报道其性能仍明显低于无机热电材料。石墨烯是一种有着超高电导率和Seebeck系数的材料,然而由于其热导率太高,故不适合单独作为热电材料应用。在此背景下,本文采用聚吡咯和石墨烯为研究体系,探索将二者复合,得到一种具有优异热电性能的石墨烯-聚吡咯复合材料,并对其制备方法、结构与形貌表征、热电性能以及结构-功能性关系机理等进行研究。主要内容和研究结果如下。采用化学氧化聚合的方法,通过实验条件的系统研究和优化,制备了粉末状聚吡咯材料；利用多种现代分析技术对产物的形貌、结构和热电性能进行了系列表征与测试。利用模板导向的原位聚合方法,采用与制备聚吡咯类似的聚合条件,以石墨烯纳米片层为模板,通过单体吸附并在其表面原位聚合制备了石墨烯表面含有聚吡咯包覆层的复合材料。经SEM和TEM观察证实,复合材料中石墨烯片层表面的包覆层厚度均一、可控。更重要的是,与纯聚吡咯相比,引入石墨烯后制备的复合材料热电性能有大幅度提升,石墨烯与吡咯质量比是2：1时,复合材料的功率因子是纯聚吡咯的84倍。另外,本文重点研究了分散剂SDS对于复合材料制备和热电性能的影响。结果表明,SDS明显促进了石墨烯在水中的分散,显著提高了吡咯在水中的聚合速率,并大幅提高了聚毗咯的电导率。
[Abstract]:Compared with inorganic thermoelectric materials, organic thermoelectric materials have the advantages of flexibility, processability, low thermal conductivity and low cost. Graphene is a kind of material with high conductivity and Seebeck coefficient. However, because of its high thermal conductivity, graphene is not suitable to be used as a thermoelectric material alone. Under this background, a kind of graphene polypyrrole composite with excellent thermoelectric properties was obtained by using polypyrrole and graphene as research systems, and the preparation method, structure and morphology of the composites were characterized. The thermoelectric properties and the mechanism of structure-functional relationship were studied. The main contents and results are as follows. The powder polypyrrole materials were prepared by chemical oxidation polymerization, and the morphology, structure and thermoelectric properties of the products were characterized and tested by a variety of modern analytical techniques. Using template oriented in situ polymerization, using the polymerization conditions similar to the preparation of polypyrrole, using graphene nanocrystalline as template, The composites containing polypyrrole coating on graphene surface were prepared by monomer adsorption and in situ polymerization. The results of SEM and TEM show that the coating thickness of graphene lamellar is uniform and controllable. More importantly, compared with pure polypyrrole, the thermoelectric properties of the composites prepared by the introduction of graphene are greatly improved. When the mass ratio of graphene to pyrrole is 2:1, the power factor of the composite is 84 times that of pure polypyrrole. In addition, the influence of dispersant SDS on the preparation and thermoelectric properties of composites was studied. The results show that SDS can obviously promote the dispersion of graphene in water, increase the polymerization rate of pyrrole in water, and increase the conductivity of Polymeric pyrrole.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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