▎ 摘　　要

NOVELTY - Preparing self-heatable laser-induced graphene flexible nitrogen dioxide gas sensor comprises (i) cutting the polyimide tape to rectangular shape of the required size, (ii) adhering the tape obtained in step (i) to the surface of the glass slide through hydrosol, (iii) inducing three-dimensional graphene pattern on the polyimide tape obtained in step (ii) using high-energy laser, the three-dimensional graphene pattern includes electrode connection areas at both ends and single-line graphene area connecting the two electrode connection areas, (iv) completely coating the upper surface of the electrode connection area obtained in step (iii) with conductive silver ink to form silver coating area and (v) separating the silver-coated assembly from the glass slide, transferring into flexible stretchable substrate through thermoactive adhesive tape to form flexible gas sensor. USE - The sensor is useful in environmental monitoring and medical diagnosis. ADVANTAGE - The method: facilitates the rapid desorption of nitrogen dioxide gas molecules; improves the repeatability of the sensor; reduces the manufacturing cost; and has short manufacturing cycle; high sensitivity; and detection limit of 10 ppb. DETAILED DESCRIPTION - Preparing self-heatable laser-induced graphene flexible nitrogen dioxide gas sensor comprises (i) cutting the polyimide tape to rectangular shape of the required size, (ii) adhering the tape obtained in step (i) to the surface of the glass slide through hydrosol, (iii) inducing three-dimensional graphene pattern on the polyimide tape obtained in step (ii) using high-energy laser, the three-dimensional graphene pattern includes electrode connection areas at both ends and single-line graphene area connecting the two electrode connection areas, the single-line graphene area serving to connect the connection area of the two electrodes, forming conductive path and at the same time directly serving as gas-sensitive area, the width of the single-line graphene is 40-90 mu m, (iv) completely coating the upper surface of the electrode connection area obtained in step (iii) with conductive silver ink to form silver coating area and (v) separating the silver-coated assembly from the glass slide, transferring into flexible stretchable substrate through thermoactive adhesive tape to form flexible gas sensor.