A Super‐Stretchable Liquid Metal Foamed Elastomer for Tunable Control of Electromagnetic Waves and Thermal Transport

It is remarkably desirable and challenging to design a stretchable conductive material with tunable electromagnetic‐interference (EMI) shielding and heat transfer for applications in flexible electronics. However, the existing materials sustained a severe attenuation of performances when largely str...

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Bibliographic Details
Published in:Advanced science 2020-06, Vol.7 (12), p.2000177-n/a
Main Authors: Yu, Dehai, Liao, Yue, Song, Yingchao, Wang, Shilong, Wan, Haoyu, Zeng, Yanhong, Yin, Tao, Yang, Wenhao, He, Zhizhu
Format: Article
Language:English
Subjects:
Communication
Communications
Conductivity
elastomer composites
electromagnetic interference shielding
Electronics
foamed elastomers
Graphene
Heat conductivity
liquid metals
Phase transitions
Robotics
Solids
thermal conductivity switch
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Summary:It is remarkably desirable and challenging to design a stretchable conductive material with tunable electromagnetic‐interference (EMI) shielding and heat transfer for applications in flexible electronics. However, the existing materials sustained a severe attenuation of performances when largely stretched. Here, a super‐stretchable (800% strain) liquid metal foamed elastomer composite (LMF‐EC) is reported, achieving super‐high electrical (≈104 S cm−1) and thermal (17.6 W mK−1) conductivities under a large strain of 400%, which also exhibits unexpected stretching‐enhanced EMI shielding effectiveness of 85 dB due to the conductive network elongation and reorientation. By varying the liquid and solid states of LMF, the stretching can enable a multifunctional reversible switch that simultaneously regulates the thermal, electrical, and electromagnetic wave transport. Novel flexible temperature control and a thermoelectric system based on LMF‐EC is furthermore developed. This work is a significant step toward the development of smart electromagnetic and thermal regulator for stretchable electronics. This work reports a super‐stretchable liquid metal foamed elastomer composite with both high electrical and thermal conductivities, and electromagnetic interference shielding effectiveness of 85 dB even when strained at 400% due to the stretching enabled conductive network elongation and reorientation, which also exhibits unique multifunctional reversible switch responses for application to tunable control of electromagnetic waves and thermal transport.
ISSN:2198-3844
2198-3844
DOI:10.1002/advs.202000177