【作者】 王雷； 贾小乐； 王大刚；

【Author】 WANG Lei,JIA Xiaole,WANG Dagang( Shenzhen Key Laboratory of Special Functional Materials,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China

【机构】 深圳大学材料科学与工程学院,深圳市特种功能材料重点实验室；

【摘要】 <正>近年来,热电材料的研究引起了广泛的关注。长期以来人们主要集中在无机热电材料,但无机热电材料存在热电转化效率低、成本高、加工困难、有毒等缺点,限制了其广泛应用。与无机热电材料相比,导电高分子热电材料具有资源丰富、价格低廉、易合成、易加工、且热导率低等突出优点,被认为是很有前途的热电材料。但遗憾的是导电高分子材料的Seebeck更多还原

【Abstract】 Polythiophene(PTh)/multiwall carbon nanotubes(MWNT) composites with different loadings of MWNT were prepared via solution mixing and ball-milling.The morphology,the internal structure and thermal stability of the composites were evaluated by field emission scanning electron microscopy,X-ray diffraction,Fourier transform infrared spectroscopy and thermo-gravimetry.The results showed that the MWNT were uniformly dispersed in the polymer matrix and the composite materials showed good thermal stability under 200℃.The thermoelectric properties including the electrical conductivity,the Seebeck coefficient and the thermal conductivity,were also investigated as a function of MWNT content.With increasing MWNT loading,the Seebeck coefficient slightly fluctuated,varying from 27.7 down to 22.7μV/K,and the thermal conductivity slightly increased,while the electrical conductivity remarkably increased,leading to an obvious enhancement in the thermoelectric figure of merit.This was attributed to the large number of interfaces present in the composites,which allowed high-energy electrons to be transported while impeding phonon transport.The highest ZT of the composites was calculated to be 8.71×10-4 at 120℃with MWNT concentration of 80 wt%.更多还原