Highly conductive liquid metal thin-film using evaporation
발표자
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초록
내용
Liquid metals are an attractive material for stretchable electronics due to high conductivity, stretchability, and non-toxicity. However, the high surface tension of liquid metals interrupts the formation of thin film. We propose a novel stretchable over-layered indium/gallium (OIG) electrode adopting the following strategy; control of the surface energy and separation of indium (island) and gallium (bridge) by the surface oxide film of indium. Significantly, the optimized OIG film exhibits negative piezo-resistivity, which decreases the resistance to 20% during 50% stretching (sheet resistance from 21.2 Ω/sq to 4.3 Ω/sq) and increases 13% in resistance change during 50,000 fatigue tests. Also, the OIG electrode does not generate liquid metal embrittlement (LME) even when it contacts with aluminum, contrary to EGaIn.