Strain sensors based on in-drop spooling of conducting micro fibers into a liquid phase
발표자
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초록
내용
The demand for wearable electronic devices has changed the basic structure of strain gauges or sensors from brittle to stretchable platform. Stretchable strain sensors are typically composed of active sensing materials combined with flexible and stretchable supporting substrates. Here, we report a resistive-type strain sensor based on extremely stretchable conducting micro-fibers, which can be embedded in a wettable non-volatile liquid phase. First, polymer micro-fibers are continuously wet-spun, and then metallic layers are deposited on the core, to optimize the elastocapillary deformation and conductivity of the conducting fibers into a liquid phase. An optimized conducting fiber embedded into an oil droplet produces extremely high stretchability of ＞2,000% and high conductivity (＞10-6 Ωcm), showing high resistance variation with an increase in strain. Also, a specific conductive fiber-embedded liquid hybrid structure can produce a tiny resistance variation (＜5% at 100% strain).