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

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Flexible piezoresistive sensors are vital for wearable electronics and robotics.
• Current sensors face challenges in achieving both high sensitivity and a wide linear range.

Purpose of the Study:

• To develop a high-performance flexible piezoresistive pressure sensor with enhanced sensitivity and a wide linear range.
• To explore hierarchical structural engineering for improved sensor performance.

Main Methods:

• Fabrication of a sensor using a MXene/MWCNTs-PDMS composite and a PDMS membrane with inverted conical microstructures.
• Integration of a microsphere-regulated barrier layer to modulate contact behavior.
• Hierarchical structural engineering for optimized piezoresistive response.

Main Results:

• Achieved an ultra-wide detection range (0-1228.75 kPa) with a three-stage linear response.
• Demonstrated excellent sensitivity up to 9041.8 kPa^-1.
• Maintained stability over 5000 cycles at 625 kPa and showed reliable detection of physiological signals.

Conclusions:

• The developed MXene-based sensor offers a scalable solution for next-generation wearable electronics and intelligent robotics.
• Hierarchical structural engineering is effective in enhancing the performance of flexible piezoresistive sensors.
• The sensor design provides new insights for advanced flexible sensing systems.