摘要
本文以导电高分子PEDOT:PSS、多壁碳纳米管(MWCNTs)、银纳米片(Ag)为原料制备了导电复合气凝胶.研究发现,该材料具有特殊的3D网络结构,并且该结构的存在有利于复合材料电导率和Seebeck系数同时提高,而热导率保持较低水平.室温下复合材料热导率低至0.06 W m^(-1)k^(-1),比表面积高达228 m^2 g^(-1).当Ag含量为33.32%时,该气凝胶热电材料室温下zT值最高为7.56×10^(-3).虽然该zT值仍较低,尚不能用于实际生产,但本研究为热电材料的设计和开发利用提供了新的设计方法.下一步工作将立足于PEDOT:PSS气凝胶制备经济、轻质、高效的聚合物热电材料.
A significant enhancement in the thermoelectric performance was observed for three-dimensional conducting aerogels,which were obtained from poly（3,4-ethylenedioxythiophene）：poly（4-styrenesulfonic）（PEDOTrPSS） and multiwalled carbon nanotubes（MWCNTs） suspensions by adding different concentrations of metallic silver（Ag）.It was found that the electrical conductivity and Seebeck coefficient could be simultaneously increased with the unique structure.Moreover,the conducting aerogels have an ultralow thermal conductivity（0.06 W m^（-1） K^（-1） and a large Brunauer-Emmett-Teller surface area（228 m^2 g^（-1）.The highest figure of merit（zT） value in this study was 7.56×10^（-3） at room temperature upon the addition of 33.32 wt.%Ag.Although the zT value was too low,our work may provide new insights into the design and development of the thermoelectric material for applications.Further investigation with PEDOTrPSS aerogels will be continued to get an economical,lightweight,and efficient polymer thermoelectric material.
基金
supported by the National Natural Science Foundation of China(51303116)
