Micro/Nanosphere-Regulated MXene-Based Flexible Piezoresistive Sensor with Ultra-High Sensitivity and Broad Detection...

Flexible piezoresistive sensors are crucial for wearable electronics and intelligent robotics due to their high sensitivity and wide linear range. However, achieving both wide linear range and high sensitivity remains challenging. A high-performance MXene-based flexible piezoresistive pressure sensor featuring hierarchical structural engineering is reported. The sensor integrates a microsphere-regulated barrier layer to modulate contact behavior, a MXene/MWCNTs-PDMS composite for stable conductivity, and an outer PDMS membrane with inverted conical microstructures to enhance sensitivity. This design achieves an ultra-wide detection range with a three-stage linear response (0-1228.75 kPa) and an excellent sensitivity (up to 9041.8 kPa^-1), maintaining stability over 5000 cycles at 625 kPa. The device demonstrates reliable detection of physiological signals and material recognition, offering a scalable solution for wearable electronics and intelligent robotics. This work is expected to provide new insights into the design of next-generation high-performance flexible sensing systems.