Chun Zhang , Yalong Liu , Hui Li , Siqi Liu , Pengcheng Li , Han Zhang , Chaobin He
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The doping degree was optimized by varying coagulation baths, bath durations, and dopant loadings in the spinning solution, followed by fixing process during air drying to decrease shrinkage and enhance orientation of the fiber. Hexane coagulated CNTs/PANI fibers exhibited a higher doping degree of PANI compared to that of acetone and ethyl acetate, resulting in a maximum TE power factor of 77.4 μW m<sup>−1</sup>K<sup>−2</sup> for 71 wt% CNTs/PANI fibers at PANI/dopant molar ratio of 2:1.25. Further fixing process induced a more oriented structure along the fibers, facilitating carrier transport and contributing to a significantly increased conductivity of 2155 S cm<sup>−1</sup>. Consequently, the CNTs/PANI fibers reached an optimal power factor of 91.8 μW m<sup>−1</sup>K<sup>−2</sup>. With outstanding TE performance and mechanical properties, the resultant fibers were assembled to fabricate a flexible TE generator, which generated a high output power of 2.5 nW with a temperature gradient of 10 K. These results demonstrate the potential of high-performance CNTs/PANI fibers to harvest body heat for the power supply of the wearable electronics.</p></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":null,"pages":null},"PeriodicalIF":8.3000,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced thermoelectric properties of carbon nanotubes/polyaniline fibers through engineering doping level and orientation\",\"authors\":\"Chun Zhang , Yalong Liu , Hui Li , Siqi Liu , Pengcheng Li , Han Zhang , Chaobin He\",\"doi\":\"10.1016/j.compscitech.2024.110660\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The rapid progress of miniaturized wearable electronics has put forward great requirements for organic fiber-based thermoelectric (TE) generators. Despite polyaniline (PANI) exhibits many outstanding attributes such as facile synthesis and low cost, as well as good environmental and thermal stability, only a few PANI-based fibers were fabricated and their TE efficiency needs to be further improved. In this work, the TE performance of wet-spun carbon nanotubes (CNTs)/PANI fibers was improved by synergistic engineering doping level of PANI and orientation of the fibers. The doping degree was optimized by varying coagulation baths, bath durations, and dopant loadings in the spinning solution, followed by fixing process during air drying to decrease shrinkage and enhance orientation of the fiber. Hexane coagulated CNTs/PANI fibers exhibited a higher doping degree of PANI compared to that of acetone and ethyl acetate, resulting in a maximum TE power factor of 77.4 μW m<sup>−1</sup>K<sup>−2</sup> for 71 wt% CNTs/PANI fibers at PANI/dopant molar ratio of 2:1.25. Further fixing process induced a more oriented structure along the fibers, facilitating carrier transport and contributing to a significantly increased conductivity of 2155 S cm<sup>−1</sup>. Consequently, the CNTs/PANI fibers reached an optimal power factor of 91.8 μW m<sup>−1</sup>K<sup>−2</sup>. With outstanding TE performance and mechanical properties, the resultant fibers were assembled to fabricate a flexible TE generator, which generated a high output power of 2.5 nW with a temperature gradient of 10 K. 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引用次数: 0
摘要
微型可穿戴电子设备的快速发展对基于有机纤维的热电(TE)发生器提出了更高的要求。尽管聚苯胺(PANI)具有合成简便、成本低廉、环境和热稳定性好等诸多优点,但目前仅制备出少数基于 PANI 的纤维,其 TE 效率有待进一步提高。在这项工作中,通过对 PANI 的掺杂水平和纤维的取向进行协同工程设计,提高了湿法纺制碳纳米管 (CNT) /PANI 纤维的 TE 性能。通过改变凝固浴、凝固浴持续时间和纺丝溶液中的掺杂量来优化掺杂程度,然后在风干过程中进行固定处理,以减少收缩并提高纤维的取向性。与丙酮和乙酸乙酯相比,正己烷凝固的 CNTs/PANI 纤维显示出更高的 PANI 掺杂度,在 PANI/掺杂剂摩尔比为 2:1.25 时,71 wt% CNTs/PANI 纤维的最大 TE 功率因数为 77.4 μW m-1K-2。进一步的固定过程使纤维形成了更多的定向结构,从而促进了载流子的传输,并使导电率显著提高到 2155 S cm-1。因此,CNTs/PANI 纤维的最佳功率因数达到了 91.8 μW m-1K-2。这些结果证明了高性能 CNTs/PANI 纤维收集人体热量为可穿戴电子设备供电的潜力。
Enhanced thermoelectric properties of carbon nanotubes/polyaniline fibers through engineering doping level and orientation
The rapid progress of miniaturized wearable electronics has put forward great requirements for organic fiber-based thermoelectric (TE) generators. Despite polyaniline (PANI) exhibits many outstanding attributes such as facile synthesis and low cost, as well as good environmental and thermal stability, only a few PANI-based fibers were fabricated and their TE efficiency needs to be further improved. In this work, the TE performance of wet-spun carbon nanotubes (CNTs)/PANI fibers was improved by synergistic engineering doping level of PANI and orientation of the fibers. The doping degree was optimized by varying coagulation baths, bath durations, and dopant loadings in the spinning solution, followed by fixing process during air drying to decrease shrinkage and enhance orientation of the fiber. Hexane coagulated CNTs/PANI fibers exhibited a higher doping degree of PANI compared to that of acetone and ethyl acetate, resulting in a maximum TE power factor of 77.4 μW m−1K−2 for 71 wt% CNTs/PANI fibers at PANI/dopant molar ratio of 2:1.25. Further fixing process induced a more oriented structure along the fibers, facilitating carrier transport and contributing to a significantly increased conductivity of 2155 S cm−1. Consequently, the CNTs/PANI fibers reached an optimal power factor of 91.8 μW m−1K−2. With outstanding TE performance and mechanical properties, the resultant fibers were assembled to fabricate a flexible TE generator, which generated a high output power of 2.5 nW with a temperature gradient of 10 K. These results demonstrate the potential of high-performance CNTs/PANI fibers to harvest body heat for the power supply of the wearable electronics.
期刊介绍:
Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites.
Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.