Highly conductive and stretchable liquid metal-PVA hydrogel composite electrodes
발표자
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초록
내용
Hydrogels are promising materials for next-generation wearable electronic devices such as electronic skins and biosensors due to their extreme stretchability, biocompatibility, and skin-like modulus. However, it is still challenging to achieve both high conductivity and stretchability as stretchable electrodes. In this study, we report highly conductive and stretchable liquid metal (LM)-poly (vinyl alcohol) (PVA) hydrogels with glutaraldehyde (GA) as crosslinkers. Ga-based LMs have intrinsic fluidity, low melting points, high conductivity and native oxide skins that can readily interact with hydroxyl groups in PVA hydrogels. It is demonstrated that LM microparticles are successfully dispersed in the hydrogels and form conductive pathways after drying and sedimentation process. Also, the LM-PVA hydrogel composites exhibit excellent stretchability and low modulus, which are suitable for soft electrodes for wearable electronic devices.