Intrinsic elastic conductors with internal buckled electron pathway for flexible electromagnetic interference shielding and tumor ablation

The elastic conductor is crucial in wearable electronics and soft robotics. The ideal intrinsic elastic bulk conductors show uniform three-dimensional conductive networks and stable resistance during large stretch. A challenge is that the variation of resistance is high under deformation due to disc...

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Bibliographic Details
Published in:Science China materials 2020-07, Vol.63 (7), p.1318-1329
Main Authors: He, Wenqian, Zhang, Rui, Cheng, Yuanyuan, Zhang, Chao, Zhou, Xiang, Liu, Zhuangjian, Hu, Xiaoyu, Liu, Zhongsheng, Sun, Jinkun, Wang, Yinsong, Qian, Dong, Liu, Zunfeng
Format: Article
Language:English
Subjects:
Ablation
Automation
Carbon nanotubes
Chemistry and Materials Science
Chemistry/Food Science
Conductivity
Conductors
Dimensional stability
Elastic deformation
Electromagnetic shielding
Fasteners
Finite element method
Manufacturing engineering
Materials Science
Microstructural analysis
Robotics
Self-assembly
Strain analysis
Strain relaxation
Tumors
Two dimensional analysis
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Summary:The elastic conductor is crucial in wearable electronics and soft robotics. The ideal intrinsic elastic bulk conductors show uniform three-dimensional conductive networks and stable resistance during large stretch. A challenge is that the variation of resistance is high under deformation due to disconnection of conductive pathway for bulk elastic conductors. Our strategy is to introduce buckled structure into the conductive network, by self-assembly of a carbon nanotube layer on the interconnecting micropore surface of a prestrained foam, followed by strain relaxation. Both unfolding of buckles and flattening of micropores contributed to the stability of the resistance under deformation (2.0% resistance variation under 70% strain). Microstructural analysis and finite element analysis illustrated different patterns of two-dimensional buckling structures could be obtained due to the imperfections in the conductive layer. Applications as all-directional interconnects, stretchable electromagnetic interference shielding and electrothermal tumor ablation were demonstrated.
ISSN:2095-8226
2199-4501
DOI:10.1007/s40843-020-1266-9