Laser-induced graphene and laser-induced graphene/carbon nanotube-based sensors for temperature and strain sensing

Abstract Laser-induced graphene (LIG) has gained significant attention in the field of sensor research due to its exceptional properties and ease of fabrication. In this study, we present the development of flexible temperature sensors and strain sensors by transferring LIG onto polydimethylsiloxane (PDMS). The temperature sensor exhibits a sensitivity of 0.444% per degree Celsius, which was validated through its practical application in breath monitoring and blowing detection. The strain sensor possesses a measurement range of approximately 35% with a sensitivity of about 370.6. Furthermore, when carbon nanotubes (CNTs) were applied to augment the LIG, creating a more extensive conductive network and a denser structure, both the strain range and sensitivity of the sensor were notably increased to 45% and 483.1, respectively. The enhanced strain sensor's capabilities were showcased through its application in monitoring human joint movements and detecting sound vibrations. These findings underscore the substantial potential of LIG for producing low-cost, flexible, and eco-friendly sensors.