Flexible Pressure Sensor With Multi‐Stage Microdome Structure Enabling Ultra‐Wide Linear Range and High Sensitivity for Wearable Applications

Flexible piezoresistive sensors show significant application potential in wearable health monitoring, motion recognition, and human-machine interaction. However, current sensors often face a trade-off between insufficient sensitivity and rapid saturation at high pressures, making it difficult to simultaneously achieve both high sensitivity and a wide pressure detection range. Herein, we propose an MXene-based flexible piezoresistive sensor with a multi-stage microdome (MSM) structure, enabling high sensitivity and a broad response range. Benefitting from the multi-stage compression and stepwise contact feature of this architecture, the prepared MXene-based flexible pressure sensor achieves an ultra-wide detection range of up to 2500 kPa and a high sensitivity of 11.57 kPa^{- 1}. Coupled with deep learning algorithms, the designed palm- and sole-shaped sensor arrays enable effective Morse code recognition, object grasping recognition, and human motion recognition, achieving a high recognition accuracy exceeding 95%. The developed MSM architecture presents a promising strategy for resolving the longstanding challenge of balancing high sensitivity and extended pressure detection range in piezoresistive sensors, offering an effective pathway to promote their large-scale implementation.