Intelligent Flexible Pressure Sensors with Improved Sensing Range and Sensitivity Based on 3D-Graphene Patterning Induced by UV Laser
Weiye Jin, Jiayun Pei, Yutong Cao, Haiyan Zhao
Abstract
Intelligent flexible sensors are an integral component of the next generation of consumer electronics. However, developing a flexible pressure sensing system that possesses both high sensitivity and a sensing range remains a key challenge in practical applications. Herein, a machine learning-assisted 3D laser-induced graphene (3D-LIG)/polydimethylsiloxane composite flexible pressure sensing system based on ultraviolet (UV) laser integrated fabrication was proposed. Low-cost LIG-based flexible sensors with a 3D carbonized structure were prepared by selective UV laser ablation and laser-induced graphitization. The interlayer interlocking structure, combined with the internal porous structure of LIG, enriches the sensing mechanism, allowing the sensor to exhibit triphasic linear response characteristics, demonstrating a large sensing range (0–500 kPa) and high sensitivity (0–20 kPa, 3.047 kPa –1 ). Based on machine-learning algorithms, an intelligent wearable sign language translation system was constructed capable of high-precision recognition of complex sign language sequence information. The integration of LIG with 3D microstructures allows a wider space for designing LIG-based flexible sensing structures and offers a promising platform for the development of intelligent wearable devices.