Qu Sanyin, Wang Mengdi, Chen Yanling, Yao Qin, Chen Lidong
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050 China
University of Chinese Academy of Sciences Beijing 100049 China.
RSC Adv. 2018 Oct 2;8(59):33855-33863. doi: 10.1039/c8ra07297c. eCollection 2018 Sep 28.
Carbon nanotubes (CNTs) have emerged as one of the leading additives for improving the thermoelectric properties of organic materials due to their unique structure and excellent electronic transport properties. However, since as-grown CNTs generally possess different diameters, it is of high interest to determine the influence of the diameter of carbon nanotubes on the thermoelectric properties of CNT/poly(3-hexylthiophene) (P3HT) composite films. Herein, we prepared CNT/P3HT composite films with diameters of <8 nm, 8-15 nm, 20-30 nm, 30-50 nm and >50 nm and studied their thermoelectric properties. It was found that the diameter of CNTs had an important influence on the TE performance of the composite films. The P3HT- (<8 nm) and P3HT- (8-15 nm) composite films exhibited almost the same thermoelectric performance and almost more than double that of the other three composite films with increased CNT diameter. The different mass fractions of CNT/P3HT composite films have also been investigated. The maximum TE power factor of CNT ( < 8 nm)/P3HT composite films reached 49.0 μW mK at the mass fraction of 95 wt% P3HT, that is, 5 wt% CNTs. This superior TE power factor of CNT ( < 8 nm)/P3HT composite films can be ascribed to the fully connected interlayer of the P3HT polymer and also the heterogeneous dispersion of short-length CNTs.
碳纳米管（CNTs）因其独特的结构和优异的电子传输性能，已成为改善有机材料热电性能的主要添加剂之一。然而，由于生长态的碳纳米管通常具有不同的直径，因此确定碳纳米管直径对碳纳米管/聚（3-己基噻吩）（P3HT）复合薄膜热电性能的影响具有很高的研究价值。在此，我们制备了直径小于8nm、8-15nm、20-30nm、30-50nm和大于50nm的碳纳米管/聚3-己基噻吩复合薄膜，并研究了它们的热电性能。结果发现，碳纳米管的直径对复合薄膜的热电性能有重要影响。P3HT-（<8nm）和P3HT-（8-15nm）复合薄膜表现出几乎相同的热电性能，并且几乎是其他三种碳纳米管直径增加的复合薄膜的热电性能的两倍多。我们还研究了不同质量分数的碳纳米管/聚3-己基噻吩复合薄膜。在P3HT质量分数为95wt%（即5wt%碳纳米管）时，碳纳米管（<8nm）/聚3-己基噻吩复合薄膜的最大热电功率因子达到49.0μW mK。碳纳米管（<8nm）/聚3-己基噻吩复合薄膜的这种优异热电功率因子可归因于聚3-己基噻吩聚合物的完全连接的中间层以及短长度碳纳米管的异质分散。
