Hierarchical Ridge Structure Inspired by Bamboo Enables Sensitive and Wide‐Range Flexible Piezoresistive Sensing

Flexible pressure sensors have great potential in varieties of applications, such as human motion monitoring, human–machine interfaces and e‐skins. Through the integration of novel materials and innovative structural designs, substantial efforts have been devoted to augmenting the sensitivity, detection range, and operational stability of flexible pressure sensors for targeted application scenarios. However, in specific application domains such as robotic tactile systems, intelligent prosthetics, and wearable medical devices, sensors are required to concurrently exhibit both an extensive detection range and heightened sensitivity—a combination that remains unattainable for current flexible pressure sensors. Therefore, inspired by bamboo, a piezoresistive sensor composed of multiwalls carbon nanotubes and polydimethylsiloxane (PDMS/MWCNTs) films based on special surface morphology of ridges structure was fabricated through a facile and cost‐effective way. Thanks to the ridges structure, the sensor displayed a high sensitivity of 11.68 kPa −1 under pressure range up to 23 kPa and a wide detecting range from 116 Pa to 126 kPa. Besides, due to the hierarchical ridges structure, the sensor showed excellent linearity under three different pressure ranges ( R 2 > 0.92). Moreover, a series of studies have been made to demonstrate the practical application in human motion monitoring and muscular movement detection.