Flexible polyvinylidene fluoride/multiwall carbon nanotube-based thermoelectric composite films with excellent environmental stability and enhanced power factor from ferroelectric polarization

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science China Materials Pub Date : 2025-03-05 DOI:10.1007/s40843-024-3240-9

Qinghui Jiang (, ), Zhenxiang Yu (, ), Xinyue Zhang (, ), Shanliang Chen (, ), Jitao Yi (, ), Yong Liu (, )

{"title":"Flexible polyvinylidene fluoride/multiwall carbon nanotube-based thermoelectric composite films with excellent environmental stability and enhanced power factor from ferroelectric polarization","authors":"Qinghui Jiang \n (, ), Zhenxiang Yu \n (, ), Xinyue Zhang \n (, ), Shanliang Chen \n (, ), Jitao Yi \n (, ), Yong Liu \n (, )","doi":"10.1007/s40843-024-3240-9","DOIUrl":null,"url":null,"abstract":"<div><p>Flexible thermoelectric (TE) films and devices have potential applications in wearable technology and the Internet of Things. One of the main challenges is how to simultaneously achieve good TE performance and high chemical/thermal stability in air with low cost and large-scale production. To address this, we utilized tape casting to fabricate composite films of polyvinylidene fluoride (PVDF) and multi-walled carbon nanotubes (MWCNTs). In the composite, polar β-PVDF introduced by hot pressing can decouple the electrical conductivity and Seebeck coefficient and significantly lead to enhanced power factor of MWCNTs/PVDF composite film. As a result, the MWCNTs (60 wt%)/PVDF film has a power factor of 1.1–1.4 µW m<sup>−1</sup> K<sup>−2</sup> near room temperature. The film also has excellent flexibility and stability in the air. Its power factor is decreased by only 9% after 1000 bends and can keep stable in air for above 6 months, which is much longer than that (15 days) of Bi<sub>2</sub>Te<sub>3</sub>/PEDOT: PSS film. A demo TE device with 10 p-type legs has an output voltage of 11.5 mV and output power of 47.53 nW at a temperature difference of 60°C. The above descriptions make the MWCNTs/PVDF films have a significant advantage in the commercial application of flexible TE devices.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":773,"journal":{"name":"Science China Materials","volume":"68 4","pages":"1240 - 1248"},"PeriodicalIF":7.4000,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science China Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s40843-024-3240-9","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Flexible thermoelectric (TE) films and devices have potential applications in wearable technology and the Internet of Things. One of the main challenges is how to simultaneously achieve good TE performance and high chemical/thermal stability in air with low cost and large-scale production. To address this, we utilized tape casting to fabricate composite films of polyvinylidene fluoride (PVDF) and multi-walled carbon nanotubes (MWCNTs). In the composite, polar β-PVDF introduced by hot pressing can decouple the electrical conductivity and Seebeck coefficient and significantly lead to enhanced power factor of MWCNTs/PVDF composite film. As a result, the MWCNTs (60 wt%)/PVDF film has a power factor of 1.1–1.4 µW m⁻¹ K⁻² near room temperature. The film also has excellent flexibility and stability in the air. Its power factor is decreased by only 9% after 1000 bends and can keep stable in air for above 6 months, which is much longer than that (15 days) of Bi₂Te₃/PEDOT: PSS film. A demo TE device with 10 p-type legs has an output voltage of 11.5 mV and output power of 47.53 nW at a temperature difference of 60°C. The above descriptions make the MWCNTs/PVDF films have a significant advantage in the commercial application of flexible TE devices.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

柔性聚偏氟乙烯/多壁碳纳米管热电复合薄膜具有优异的环境稳定性和增强的铁电极化功率因数

柔性热电薄膜和器件在可穿戴技术和物联网方面具有潜在的应用前景。其中一个主要挑战是如何同时实现良好的TE性能和高的空气化学/热稳定性，低成本和大规模生产。为了解决这个问题，我们利用胶带铸造技术制造了聚偏氟乙烯（PVDF）和多壁碳纳米管（MWCNTs）的复合薄膜。在复合材料中，热压引入极性β-PVDF可以解耦MWCNTs/PVDF复合膜的电导率和塞贝克系数，显著提高MWCNTs/PVDF复合膜的功率因数。因此，MWCNTs (60 wt%)/PVDF薄膜在室温附近的功率因数为1.1-1.4µW m−1 K−2。该薄膜在空气中也具有优异的柔韧性和稳定性。经过1000次弯曲后，其功率因数仅下降9%，在空气中可以保持6个月以上的稳定，这比Bi2Te3/PEDOT: PSS薄膜的15天要长得多。10个p型支腿的演示TE，在60℃温差下，输出电压11.5 mV，输出功率47.53 nW。以上描述使得MWCNTs/PVDF薄膜在柔性TE器件的商业应用中具有显著的优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.