▎ 摘　　要

NOVELTY - Method for preparing three-dimensional (3D) graphene structure by 3D printing involves (a) fixing polyimide (PI) paper on substrate, and subjecting the PI paper to laser-induction to produce a laser-induced graphene (LIG) substrate, (b) layering the polymer powder on the surface of the substrate, (c) performing laser selective carbonization using a carbon dioxide laser on the layered polymer powder to obtain a pre-designed single-layer graphene film, (d) again layering polymer powder on the surface of the formed graphene, (e) again performing laser selective carbonization using a carbon dioxide laser on the layered polymer powder to obtain a pre-designed single-layer graphene film, (f) repeating steps (d) and (e) until the printing is completed and obtaining 3D graphene structure and (g) soaking the 3D graphene structure obtained in (f) in an organic solvent and performing heat treatment to obtain optimized 3D graphene structure. USE - The method is useful for preparing 3D graphene structure which is used as sensor, heater, energy storage device, power generation device, adsorption interface, resistance combustion interface and catalyst (claimed) and in energy storage, catalyst, environmental protection, sensor, biological medical treatment, and optical and thermal fields. ADVANTAGE - The method provides high-efficient and reliable forming method of three-dimensional graphene, at the same time of maintaining the three- dimensional graphene shape, improving the comprehensive performance of the three dimensional graphene. The homogeneity of the material, specific surface area, porosity and conductivity are greatly improved, so that it is applied to the super capacitor electrode material with higher specific capacitance, energy density and power density. The method can realize the direct preparation of three dimensional (3D) graphene structure of various appearances. DETAILED DESCRIPTION - Method for preparing three-dimensional (3D) graphene structure by 3D printing involves (a) fixing polyimide (PI) paper on substrate, and subjecting the PI paper ro laser-induction to produce a laser-induced graphene (LIG) substrate, (b) layering the polymer powder on the surface of the substrate into a thickness of 60-80% with respect to the graphene growth height, (c) performing laser selective carbonization using a 10.6 microm carbon dioxide laser on the layered polymer powder to obtain a pre-designed single-layer graphene film, (d) again layering polymer powder on the surface of the formed graphene into a thickness of 60-80% with respect to the graphene growth height, (e) again performing laser selective carbonization using a 10.6 microm carbon dioxide laser on the layered polymer powder to obtain a pre-designed single-layer graphene film, (f) repeating steps (d) and (e) until the printing is completed and obtaining 3D graphene structure and (g) soaking the 3D graphene structure obtained in (f) in an organic solvent and performing heat treatment to obtain optimized 3D graphene structure. The relationship between the laser processing power used and the thickness of the powder is: L=a (93.5x-15.5) (I), where a represents the correlation coefficient, which is (60-80%), x represents the laser power in W, and L represents the layering thickness of the powder layer in microm.