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

IF 6.8 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 (, )

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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.

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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.