Highly twisted supercoils for superelastic multi-functional fibres

Wonkyeong Son, Sungwoo Chun, Jae Myeong Lee, Yourack Lee, Jeongmin Park, Dongseok Suh, Duck Weon Lee, Hachul Jung, Young-Jin Kim, Younghoon Kim, Soon Moon Jeong, Sang Kyoo Lim and Changsoon Choi ()
Additional contact information
Wonkyeong Son: Division of Smart Textile Convergence Research, DGIST
Sungwoo Chun: Sungkyunkwan University
Jae Myeong Lee: Division of Smart Textile Convergence Research, DGIST
Yourack Lee: Sungkyunkwan University
Jeongmin Park: Sungkyunkwan University
Dongseok Suh: Sungkyunkwan University
Duck Weon Lee: Hanyang University
Hachul Jung: Osong Medical Innovation Foundation
Young-Jin Kim: Osong Medical Innovation Foundation
Younghoon Kim: Convergence Research Center for Solar Energy, DGIST
Soon Moon Jeong: Division of Smart Textile Convergence Research, DGIST
Sang Kyoo Lim: Division of Smart Textile Convergence Research, DGIST
Changsoon Choi: Division of Smart Textile Convergence Research, DGIST

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Highly deformable and electrically conductive fibres with multiple functionalities may be useful for diverse applications. Here we report on a supercoil structure (i.e. coiling of a coil) of fibres fabricated by inserting a giant twist into spandex-core fibres wrapped in a carbon nanotube sheath. The resulting supercoiled fibres show a highly ordered and compact structure along the fibre direction, which can sustain up to 1,500% elastic deformation. The supercoiled fibre exhibits an increase in resistance of 4.2% for stretching of 1,000% when overcoated by a passivation layer. Moreover, by incorporating pseudocapacitive-active materials, we demonstrate the existence of superelastic supercapacitors with high linear and areal capacitance values of 21.7 mF cm-1 and 92.1 mF cm-2, respectively, that can be reversibly stretched by 1,000% without significant capacitance loss. The supercoiled fibre can also function as an electrothermal artificial muscle, contracting 4.2% (percentage of loaded fibre length) when 0.45 V mm-1 is applied.

Date: 2019
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DOI: 10.1038/s41467-018-08016-w

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