Printable elastic conductors with a high conductivity for electronic textile applications

Naoji Matsuhisa, Martin Kaltenbrunner, Tomoyuki Yokota, Hiroaki Jinno, Kazunori Kuribara, Tsuyoshi Sekitani and Takao Someya ()
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Naoji Matsuhisa: Electrical and Electronic Engineering and Information Systems, The University of Tokyo
Martin Kaltenbrunner: Electrical and Electronic Engineering and Information Systems, The University of Tokyo
Tomoyuki Yokota: Electrical and Electronic Engineering and Information Systems, The University of Tokyo
Hiroaki Jinno: Electrical and Electronic Engineering and Information Systems, The University of Tokyo
Kazunori Kuribara: Electrical and Electronic Engineering and Information Systems, The University of Tokyo
Tsuyoshi Sekitani: Electrical and Electronic Engineering and Information Systems, The University of Tokyo
Takao Someya: Electrical and Electronic Engineering and Information Systems, The University of Tokyo

Nature Communications, 2015, vol. 6, issue 1, 1-11

Abstract: Abstract The development of advanced flexible large-area electronics such as flexible displays and sensors will thrive on engineered functional ink formulations for printed electronics where the spontaneous arrangement of molecules aids the printing processes. Here we report a printable elastic conductor with a high initial conductivity of 738 S cm−1 and a record high conductivity of 182 S cm−1 when stretched to 215% strain. The elastic conductor ink is comprised of Ag flakes, a fluorine rubber and a fluorine surfactant. The fluorine surfactant constitutes a key component which directs the formation of surface-localized conductive networks in the printed elastic conductor, leading to a high conductivity and stretchability. We demonstrate the feasibility of our inks by fabricating a stretchable organic transistor active matrix on a rubbery stretchability-gradient substrate with unimpaired functionality when stretched to 110%, and a wearable electromyogram sensor printed onto a textile garment.

Date: 2015
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DOI: 10.1038/ncomms8461

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