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Vol. 16 (2024)

Trunk-Inspired SWCNT-Based Wrinkled Films for Highly-Stretchable Electromagnetic Interference Shielding and Wearable Thermotherapy

https://doi.org/10.1007/s40820-024-01454-w
Xiaofeng Gong
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China
Tianjiao Hu
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China
You Zhang
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China
Yanan Zeng
School of Physics and Electronics, Hunan University, Changsha 410082, People’s Republic of China
Ye Zhang
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China
Zhenhua Jiang
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China
Yinlong Tan
Beijing Interdisciplinary Research Center, National University of Defense Technology, Changsha 410073, People’s Republic of China
Yanhong Zou
School of Physics and Electronics, Hunan University, Changsha 410082, People’s Republic of China
Jing Wang
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China
Jiayu Dai
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China
Zengyong Chu
College of Science, National University of Defense Technology, Changsha 410073, People’s Republic of China

Corresponding Author: Zengyong Chu

chuzy@nudt.edu.cn

Nano-Micro Letters, Vol. 16 (2024), Article Number: 243

Abstract

Nowadays, the increasing electromagnetic waves generated by wearable devices are becoming an emerging issue for human health, so stretchable electromagnetic interference (EMI) shielding materials are highly demanded. Elephant trunks are capable of grabbing fragile vegetation and tearing trees thanks not only to their muscles but also to their folded skins. Inspired by the wrinkled skin of the elephant trunks, herein, we propose a winkled conductive film based on single-walled carbon nanotubes (SWCNTs) for multifunctional EMI applications. The conductive film has a sandwich structure, which was prepared by coating SWCNTs on both sides of the stretched elastic latex cylindrical substrate. The shrinking-induced winkled conductive network could withstand up to 200% tensile strain. Typically, when the stretching direction is parallel to the polarization direction of the electric field, the total EMI shielding effectiveness could surprisingly increase from 38.4 to 52.7 dB at 200% tensile strain. It is mainly contributed by the increased connection of the SWCNTs. In addition, the film also has good Joule heating performance at several voltages, capable of releasing pains in injured joints. This unique property makes it possible for strain-adjustable multifunctional EMI shielding and wearable thermotherapy applications.


Highlights:
1 Elephant trunk-inspired anisotropic wrinkling structures were formed on a sandwich-like conductive film through a controlled shrinking method.
2 The wrinkled conductive network could withstand up to 200% tensile strain and exhibits a strain-enhanced electromagnetic interference shielding effectiveness when stretching parallel to the electric field polarization direction.

Keywords

Electromagnetic interference shielding Single-walled carbon nanotubes Wrinkles Stretchable Thermotherapy
Gong, Xiaofeng, Tianjiao Hu, You Zhang, Yanan Zeng, Ye Zhang, Zhenhua Jiang, Yinlong Tan, Yanhong Zou, Jing Wang, Jiayu Dai, and Zengyong Chu. 2024. “Trunk-Inspired SWCNT-Based Wrinkled Films for Highly-Stretchable Electromagnetic Interference Shielding and Wearable Thermotherapy”. Nano-Micro Letters 16 (July):243. https://doi.org/10.1007/s40820-024-01454-w.
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