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Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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High-resolution, reconfigurable printing of liquid metals with three-dimensional structures

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Title
High-resolution, reconfigurable printing of liquid metals with three-dimensional structures
Author
Park, Young-GeunAn, Hyeon SeokKim, Ju-YoungPark, Jang-Ung
Issue Date
2019-06
Publisher
American Association for the Advancement of Science
Citation
SCIENCE ADVANCES, v.5, no.6, pp.eaaw2844
Abstract
We report an unconventional approach for high-resolution, reconfigurable 3D printing using liquid metals for stretchable, 3D integrations. A minimum line width of 1.9 μm can be reliably formed using direct printing, and printed patterns can be reconfigured into diverse 3D structures with maintaining pristine resolutions. This reconfiguration can be performed multiple times, and it also generates a thin oxide interface that can be effective in preventing the spontaneous penetration of gallium atoms into different metal layers while preserving electrical properties under ambient conditions. Moreover, these free-standing features can be encapsulated with stretchable, conformal passivations. We demonstrate applications in the form of a reconfigurable antenna, which is tunable by changing geometeries, and reversibly movable interconnections used as mechanical switches. The free-standing 3D structure of electrodes is also advantageous for minimizing the number and space between interconnections, which is important for achieving higher integrations, as demonstrated in an array of microLEDs.
URI
https://scholarworks.unist.ac.kr/handle/201301/27024
URL
https://advances.sciencemag.org/content/5/6/eaaw2844
DOI
10.1126/sciadv.aaw2844
ISSN
2375-2548
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