Rapid meniscus-guided printing of stable semi-solid-state liquid metal microgranular-particle for soft electronics

Gun-Hee Lee, Ye Rim Lee, Hanul Kim, Do A Kwon, Hyeonji Kim, Congqi Yang, Siyoung Q. Choi, Seongjun Park, Jae-Woong Jeong () and Steve Park ()
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Gun-Hee Lee: Korea Advanced Institute of Science and Technology (KAIST)
Ye Rim Lee: Korea Advanced Institute of Science and Technology (KAIST)
Hanul Kim: Korea Advanced Institute of Science and Technology (KAIST)
Do A Kwon: Korea Advanced Institute of Science and Technology (KAIST)
Hyeonji Kim: Korea Advanced Institute of Science and Technology (KAIST)
Congqi Yang: Korea Advanced Institute of Science and Technology (KAIST)
Siyoung Q. Choi: Korea Advanced Institute of Science and Technology (KAIST)
Seongjun Park: Korea Advanced Institute of Science and Technology (KAIST)
Jae-Woong Jeong: Korea Advanced Institute of Science and Technology (KAIST)
Steve Park: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Liquid metal is being regarded as a promising material for soft electronics owing to its distinct combination of high electrical conductivity comparable to that of metals and exceptional deformability derived from its liquid state. However, the applicability of liquid metal is still limited due to the difficulty in simultaneously achieving its mechanical stability and initial conductivity. Furthermore, reliable and rapid patterning of stable liquid metal directly on various soft substrates at high-resolution remains a formidable challenge. In this work, meniscus-guided printing of ink containing polyelectrolyte-attached liquid metal microgranular-particle in an aqueous solvent to generate semi-solid-state liquid metal is presented. Liquid metal microgranular-particle printed in the evaporative regime is mechanically stable, initially conductive, and patternable down to 50 μm on various substrates. Demonstrations of the ultrastretchable (~500% strain) electrical circuit, customized e-skin, and zero-waste ECG sensor validate the simplicity, versatility, and reliability of this manufacturing strategy, enabling broad utility in the development of advanced soft electronics.

Date: 2022
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DOI: 10.1038/s41467-022-30427-z

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