Development of an NO Gas Sensor Based on Laser-Induced Graphene Operating at Room Temperature.

A novel, in situ, low-cost and facile method has been developed to fabricate flexible NO sensors capable of operating at ambient temperature, addressing the urgent need for monitoring this toxic gas. This technique involves the synthesis of highly porous structures, as well as the specific development of laser-induced graphene (LIG) and its heterostructures with SnO, all through laser scribing. The morphology, phases, and compositions of the sensors were analyzed using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. The effects of SnO addition on structural and sensor properties were investigated. Gas-sensing measurements were conducted at room temperature with NO concentrations ranging from 50 to 10 ppm. LIG and LIG/SnO sensors exhibited distinct trends in response to NO, and the gas-sensing mechanism was elucidated. Overall, this study demonstrates the feasibility of utilizing LIG and LIG/SnO heterostructures in gas-sensing applications at ambient temperatures, underscoring their broad potential across diverse fields.