Skin-Inspired Piezoresistive Sensor Based on Hierarchical Structures and Lignocellulosic Bioplastic Electrodes with Ultrahigh Sensitivity

Smart wearable pressure sensors have attracted widespread interest owing to their potential applications in human activity monitoring, electronic skin, and human–machine interaction. However, the inherent trade-off between sensitivity and detection range often limits their performance and practical applicability. Inspired by the multilayer architecture and ultrasensitive tactile perception of human skin, this study proposes a high-performance MXene/multiwalled carbon nanotube (MWCNT)/polydimethylsiloxane (PDMS)/lignocellulose (MMPL) piezoresistive sensor. The sensor is fabricated through a face-to-face assembly of a hierarchical micro/nanostructured sensitive layer and a green lignocellulosic Bioplastic film screen-printed with silver paste interdigitated electrodes. Furthermore, the lignocellulosic Bioplastic film not only provides lightweight mechanical flexibility but also reduces environmental impact through its inherent biodegradability. The fabricated sensor demonstrates exceptional performance, including high sensitivity (467.6 kPa –1 ), rapid response/recovery time (20 ms), a low detection limit (1.8 Pa), and robust durability (>10,000 cycles). Given its superior performance, the sensor shows great potential in applications such as detecting subtle pressure and monitoring health-related activities. When configured into an array layout, it can function as a smart artificial electronic skin capable of recognizing spatial pressure distribution. We believe that this innovative piezoresistive sensor will significantly advance the development of wearable flexible electronic devices.