▎ 摘　　要

NOVELTY - Preparing self-heating laser-induced graphene flexible nitrogen dioxide gas sensor comprises (1) cutting polyimide tape to rectangular shape of the required size, (2) adhering polyimide tape to the surface of the glass slide through hydrosol, (3) using polyimide tape to induce three-dimensional graphene pattern with high-energy laser, where three-dimensional graphene pattern comprises electrode connection areas at both ends and single line graphene area connecting two electrode connection areas, and single line graphene area play role of connecting the connecting area of two electrodes, forming conductive path, directly serving as gas-sensitive area, the width of the single-line graphene is 40-90 mu m, (4) coating upper surface of the electrode connection area with conductive silver ink to form a silver coating area, and (5) separating silver-coated assembly from the glass slide, transferring to flexible stretchable substrate through heat release tape to form flexible gas sensor. USE - The sensor is useful for environmental monitoring and medical diagnosis. ADVANTAGE - The method: is conducive to the rapid desorption of nitrogen dioxide gas molecules; improves the repeatability of the sensor; reduces manufacturing cost; has short manufacturing cycle; has high sensitivity, and reaches detection limit of 10 ppb; and has broad application prospects. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for self-heating laser-induced graphene flexible nitrogen dioxide gas sensor comprising an insulation area, an electrode area, a silver coating area and a gas sensitive area, the insulating area is arranged at the bottom end, the electrode area is arranged on the upper surface of the insulating area, two electrode connection areas formed by laser-induced graphene are provided on the left and right ends of the electrode area, coating the surface of the electrode connection area with a silver coating, forming a silver coating area, two electrode connection areas are connected together by a single-line graphene formed by laser-induced graphene, the area where the single-line graphene is located is directly the gas sensitive area, the width of single-line graphene is 40-100 mu m, two electrode connection areas and the single-line graphene form a barbell-shaped structure.