Fabrication of High-Flexibility LIG@PF/PDMS Composite for Flexible Pressure Sensors

Laser-induced graphene (LIG) suffers from embrittlement, limiting flexibility. This study presents a flexible LIG composite film using a phenolic resin (PF)/polydimethylsiloxane (PDMS) precursor. PDMS reduces embrittlement commonly caused by laser-induced carbonization while maintaining high carbon conversion. The LIG@PF/PDMS composite achieves 36% strain response, significantly enhancing flexibility and stretchability versus LIG@PF. A pressure sensor based on this film demonstrates graded sensitivity (66.67 kPa- ¹, 0-10 kPa; 34 kPa- ¹ , 10-100 kPa), rapid response (40 ms), and exceptional cyclic stability. Applied in airflow detection, robotic force monitoring, and health monitoring, the sensor was integrated with a deep learning model for speech recognition, achieving 97.67% accuracy, highlighting its potential for intelligent human-machine interaction.