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Joonhwa Choi(최준화),Phillip-Won(원필립),Seung Hwan Ko(고승환) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Recent research advances that relieve discomfort between electronic devices and the human body include the snakelike wavy design, ultra-thin and special properties of nanomaterials. However, these strategies each involve inevitable limitations to achieve optimistic form of e-skin devices. Evenly matched mechanical properties anywhere in the body and the non-recognition of electronic devices are two properties essential for future electronic skin (E-skin) devices. But achieving these two main properties at the same time is still a difficult task. Accordingly, the present inventors propose a new manufacturing method for introducing a kirigami approach for patterning highly conductive and transparent electrodes in various forms of stretchable electronic devices having multivariate configurability for E-skin applications. This kirigami pattern can be designed to intentionally limit strain or impart ultrastretchability, depending on the application in the range of 0 to 400% of tensile strain, which gives the electrode an adjustable elasticity, invariant electrical property against strain, and excellent strain reversibility. The versatility of this work is demonstrated by ultrastretch transparent Kirigami heaters for personal thermal management and epidermal transparent Kirigami electrophysiology sensors.
Hyeonseok Kim(김현석),Young D. Suh(서영덕),Jaeho Shin(신재호),Phillip Won(원필립),Seongmin Jung(정성민),Jinhyeong Kwon(권진형),Seung Hwan Ko(고승환) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
We demonstrate a novel class of flexible transparent conductor based on metal nanowire micro-bundled networks at random patterns. Original random patterns are prepared from controlled random cracking of high-stress silicon nitride on the silicon substrate, and employed as repetitively usable master molds with independently controllable pattern density and linewidth. Silver nanowires are subsequently placed in the random crack channels through a facile solution process and transferred to the polymer substrate with UV curable epoxy resin. The resultant flexible and transparent conductor, spanning over wafer scale at high reproducibility, not only exhibits enhanced mechanical robustness upon repeated bending or scratching, which often occurs when used as touch-screen panel, but also is free from the moire pattern problem due to the random nature of nanowire bundle patterns. Further application of the resultant flexible transparent conductor as a touch-screen panel confirms easy