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, Changsoon Choi

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63 Scopus citations


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.

Original languageEnglish
Article number426
JournalNature Communications
Issue number1
StatePublished - 1 Dec 2019

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Programme (NRF-2017R1A6A3A04004987) and Global Research and Development Center Program (NRF-2018K1A4A3A01064272) through the National Research Foundation of Korea funded by the Ministry of Education and Ministry of Science and ICT. This work was also supported by the DGIST R&D Programme (18-NT-02) of the Ministry of Science, ICT, and Future Planning.

Publisher Copyright:
© 2019, The Author(s).


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