Wearable\nRGO/MXene Piezoresistive Pressure Sensors\nwith Hierarchical Microspines for Detecting Human Motion

Abstract

Flexible piezoresistive pressure\nsensors may exhibit excellent\nsensing performances to be applied in wearable electronics, medical\ndiagnosis, and electronic skin. Herein, we report a multi-layer and\nphased-responsive reduced graphene oxide/MXene-based piezoresistive\npressure sensor with hierarchical microspines constructed by sandpaper\nas the template. Thanks to the multi-level and multi-layer structure,\nthe obtained sensor realized phased response and showed wide detection\nrange (up to 70 kPa), fast response (response/recovery time of 40/80\nms), and excellent working stability (1000 fatigue cycles). Furthermore,\nthe sensor was successfully applied for detecting various human motions\nincluding pulse beats, cheek bulging, nodding, finger bending, speech\nrecognition, handwriting, and other pressure signals. Besides, a 6\n× 6 sensing matrix integrated by the sensors was able to sensitively\nperceive the distribution of plane pressure. The findings in this\nwork conceivably stand out as a new strategy to fabricate high-performance\npiezoresistive pressure sensors in the fields of intelligent healthcare\nand medical diagnosis, wearable electronic devices, electronic skin,\nand human–machine interaction.