Femtosecond Laser-Fabricated Liquid Metal Pressure Sensor for Flexible Pressure Detection System

This study proposes a highly stable and reproducible liquid metal-based flexible pressure sensor fabricated by femtosecond laser-induced wettability modification and develops a corresponding pressure detection system. By harnessing the unique properties of liquid metal and femtosecond laser processing, the sensor achieves changed interfacial adhesion and structural robustness. Experimental results demonstrate the sensor's superior stability (less than 5% variation over 10,000 cycles) and high sensitivity (0.7239 KPa<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup>within the 0–60 KPa range). The integrated system incorporates a high-precision measurement module utilizing an STM32WB55 dual-mode Bluetooth chip, enabling real-time wireless data acquisition and signal conditioning. To validate practical utility, a smart glove embedded with the sensor was developed, capable of detecting dynamic pressure distribution and enabling gesture recognition. This work provides a scalable strategy for next-generation wearable electronics and applications in human-machine interaction and healthcare monitoring.