Enhanced thermoelectric performance of CNT/P3HT composites with low CNT content.
Enhanced thermoelectric performance of CNT/P3HT composites with low CNT content.
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低CNT含量的CNT/P3HT复合材料的增强热电性能
DOI：
10.1039/c8ra07297c
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发表时间：
2018-09-28
期刊：
影响因子：
3.9
通讯作者：
Chen, Lidong
中科院分区：
文献类型：
--
作者：
Qu, Sanyin;Wang, Mengdi;Chen, Yanling;Yao, Qin;Chen, Lidong
碳纳米管(CNTs)以其独特的结构和优异的电子传输性能成为改善有机材料热电性能的主要添加剂之一。然而，由于生长的碳纳米管通常具有不同的直径，因此确定碳纳米管的直径对碳纳米管/聚(3-己基噻吩基)(P3HT)复合薄膜热电性能的影响是非常有意义的。本文制备了直径分别为8 nm、8-15 nm、20-30 nm、30-50 nm和50 nm的碳纳米管/P3HT复合薄膜，并对其热电性能进行了研究。研究发现，碳纳米管的直径对复合薄膜的热膨胀性能有重要影响。P3HT-dCNT(？lt；8 nm)和P3HT-dCNT(8-15 nm)复合薄膜具有几乎相同的热电性能，几乎是其他三种纳米复合薄膜的两倍以上。并对不同质量分数的碳纳米管/P3HT复合膜进行了研究。当P3HT的质量分数为95wt%，即碳纳米管的质量分数为5wt%时，碳纳米管(d<；8 nm)/P3HT复合薄膜的TE功率因数达到49.0μW MK−2。碳纳米管(d<；8 nm)/P3HT复合薄膜优异的TE功率因数可以归因于P3HT聚合物层间的完全连接和短长碳纳米管的非均匀分散。
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-dCNT (<8 nm) and P3HT-dCNT (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 (d < 8 nm)/P3HT composite films reached 49.0 μW mK−2 at the mass fraction of 95 wt% P3HT, that is, 5 wt% CNTs. This superior TE power factor of CNT (d < 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.
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