Wu Ruili, Yuan Haocheng, Liu Chan, Lan Jin-Le, Yang Xiaoping, Lin Yuan-Hua
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology Beijing 100029 China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University Beijing 100084 P. R. China.
RSC Adv. 2018 Jul 19;8(46):26011-26019. doi: 10.1039/c8ra04863k.
The effects of polyaniline (PANI) with different polymerization times on the film-forming and thermoelectric properties as well as on the performance of SWCNTs/PANI composites were systematically investigated in this study. It was found that the film-forming and flexibility of PANI films improved with the increase in polymerization time. We showed that a super high conductivity of ∼4000 S cm can be achieved for the SWCNTs/PANI composite film, which is the highest value for the SWCNTs/PANI system at present. Both the electrical conductivity and power factor increase by an order of magnitude than that of pure PANI films and far exceed the theoretical value of the mixture model. These results suggest that the sufficiently continuous and ordered regions on the interlayer between the filler and matrix are key to improve the electrical conductivity of composites. Finally, the maximum PF reaches 100 μW m K at 410 K for the 0.6CNT/PANI5h. Furthermore, it is found that the composite films have excellent environmental and structural stability. Our results can deepen the understanding of organic-inorganic thermoelectric composite systems and facilitate the practical application of flexible and wearable thermoelectric materials.
本研究系统地研究了不同聚合时间的聚苯胺（PANI）对成膜和热电性能以及对单壁碳纳米管/聚苯胺（SWCNTs/PANI）复合材料性能的影响。研究发现，聚苯胺薄膜的成膜性和柔韧性随聚合时间的增加而提高。我们表明，SWCNTs/PANI复合薄膜可以实现约4000 S cm的超高电导率，这是目前SWCNTs/PANI体系中的最高值。电导率和功率因数均比纯聚苯胺薄膜提高了一个数量级，且远远超过混合模型的理论值。这些结果表明，填料与基体之间的层间具有足够连续且有序的区域是提高复合材料电导率的关键。最后，对于0.6CNT/PANI5h，在410 K时最大功率因数达到100 μW m K。此外，还发现复合薄膜具有优异的环境和结构稳定性。我们的结果可以加深对有机-无机热电复合体系的理解，并促进柔性和可穿戴热电材料的实际应用。
