上海科技大学知识管理系统

单壁碳管 (SWNTs)由于其优异的电传输性能而被用作有机热电材料的添加剂，以提高材料的热电性能。然而，实验室合成的碳管通常为混合型碳管 (mix-SWNT)，即含有半导体型碳管 (sc-SWNT)和金属型碳管(met-SWNT)。由于半导体型碳管和金属型碳管表面结构和电热传输性能不同，所以用混合型碳管复合不利于聚合物/碳管复合材料界面微观结构的研究及电热传输性能的调控。我们利用十二烷基聚噻吩(rr-P3DDT)成功从混合型碳管中筛分出半导体型碳管，并制备了半导体型碳管/十二烷基聚噻吩(sc-SWNTs/rr-P3DDT)复合薄膜，相对于混合型碳管/十二烷基聚噻吩(mix-SWNTs/rr-P3DDT)复合薄膜，sc-SWNTs/rr-P3DDT薄膜表面平整且致密，sc-SWNTs被rr-P3DDT包裹并均匀分散在基质中，碳管束直径小于 50 nm。最终，sc-SWNT/rr-P3DDT复合薄膜的泽贝克系数和功率因子显著提高，50 wt%碳管含量下最大功率因子约60 µW/mK²，比mix-SWNTs/rr-P3DDT复合薄膜提高了70%。本工作表明纯半导体单壁碳纳米管作为填料，对碳纳米管/聚合物纳米复合材料的热电性能提升有优化作用。

Single-walled carbon nanotubes (SWNTs) have been widely used as leading additives for improving the thermoelectric properties of organic materials due to their unique structure and excellent electronic transport properties. However, the as-synthesized SWNTs are mixtures (mix-SWNT) of semiconducting (sc-SWNT) and metallic (met-SWNT) carbon nanotubes. The much differed surface character and transport behavior of sc-SWNT and met-SWNT frequently raise the difficulty of modifying microstructures and tuning transport properties of SWNTs/organic composites when using mix-SWNTs as dispersion phase. Herein, we prepared high quality sc-SWNTs/rr-P3DDT composite film by presorting pure sc-SWNT from the raw mix-SWNTs using regioregular poly (3-dodecylthiophene) (rr-P3DDT). Both the smoothness and compactness of sc-SWNTs/rr-P3DDT are great improved as compared with the mix-SWNTs/rr-P3DDT films, and the sc-SWNTs are well dispersed and uniformly wrapped by rr-P3DDT with diameter less than 50 nm. The significantly enhanced Seebeck coefficients and power factors are obtained in the sc-SWNT/rr-P3DDT samples. As the result, the maximum power factor of 60μW/mK2 in 50wt% sc-SWNTs sample is 70% higher than that of mix-SWNTs/P3DDT sample. This work reveals the effectiveness of pure semiconductor SWNTs as fillers to optimize the thermoelectric properties of CNT/polymer nano-composites.