An Ultrastretchable and Self-Healable Nanocomposite Conductor Enabled by Autonomously Percolative Electrical PathwaysClick to copy article linkArticle link copied!
- Sun Hong KimSun Hong KimDepartment of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, 1-Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of KoreaMore by Sun Hong Kim
- Hyunseon SeoHyunseon SeoBiomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Hyunseon Seo
- Jiheong KangJiheong KangDepartment of Chemical Engineering, Stanford University, Stanford, California 94305-5025, United StatesMore by Jiheong Kang
- Jaeyoung HongJaeyoung HongAdvanced Analysis Center, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Jaeyoung Hong
- Duhwan SeongDuhwan SeongBiomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Duhwan Seong
- Han-Jin KimHan-Jin KimDepartment of Materials Science and Engineering, Korea University, Seoul 02841, Republic of KoreaMore by Han-Jin Kim
- Jaemin KimJaemin KimDepartment of Chemical Engineering, Stanford University, Stanford, California 94305-5025, United StatesMore by Jaemin Kim
- Jaewan MunJaewan MunDepartment of Chemical Engineering, Stanford University, Stanford, California 94305-5025, United StatesMore by Jaewan Mun
- Inchan YounInchan YounBiomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Inchan Youn
- Jinseok KimJinseok KimBiomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Jinseok Kim
- Yu-Chan KimYu-Chan KimBiomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Yu-Chan Kim
- Hyun-Kwang SeokHyun-Kwang SeokBiomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Hyun-Kwang Seok
- Changhee LeeChanghee LeeDepartment of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, 1-Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of KoreaMore by Changhee Lee
- Jeffrey B.-H. TokJeffrey B.-H. TokDepartment of Chemical Engineering, Stanford University, Stanford, California 94305-5025, United StatesMore by Jeffrey B.-H. Tok
- Zhenan Bao*Zhenan Bao*E-mail: [email protected]Department of Chemical Engineering, Stanford University, Stanford, California 94305-5025, United StatesMore by Zhenan Bao
- Donghee Son*Donghee Son*E-mail: [email protected]Biomedical Research Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of KoreaMore by Donghee Son
Abstract
Both self-healable conductors and stretchable conductors have been previously reported. However, it is still difficult to simultaneously achieve high stretchability, high conductivity, and self-healability. Here, we observed an intriguing phenomenon, termed “electrical self-boosting”, which enables reconstructing of electrically percolative pathways in an ultrastretchable and self-healable nanocomposite conductor (over 1700% strain). The autonomously reconstructed percolative pathways were directly verified by using microcomputed tomography and in situ scanning electron microscopy. The encapsulated nanocomposite conductor shows exceptional conductivity (average value: 2578 S cm–1; highest value: 3086 S cm–1) at 3500% tensile strain by virtue of efficient strain energy dissipation of the self-healing polymer and self-alignment and rearrangement of silver flakes surrounded by spontaneously formed silver nanoparticles and their self-assembly in the strained self-healing polymer matrix. In addition, the conductor maintains high conductivity and stretchability even after recovered from a complete cut. Besides, a design of double-layered conductor enabled by the self-bonding assembly allowed a conducting interface to be located on the neutral mechanical plane, showing extremely durable operations in a cyclic stretching test. Finally, we successfully demonstrated that electromyogram signals can be monitored by our self-healable interconnects. Such information was transmitted to a prosthetic robot to control various hand motions for robust interactive human-robot interfaces.
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