▎ 摘　　要

NOVELTY - Graphene-based elastic structure comprises graphene structural unit. The graphene structural unit is a graphene nanofilm having a thickness of 30-100 nm and an area of 100-40000 mu m2. The edge of the graphene nanofilm is crosslinked with adjacent graphene structural units to form a three-dimensional (3D) porous structure. The graphene nanofilm has a heteroatom content of less than or equal to 10 wt.% and a defect density ID/IG of greater than or equal to 0.02. USE - The elastic structure is useful as aerogel film. ADVANTAGE - The elastic structure enhances the strength and deformation modulus of graphene, greatly maintains the integrity and high conductivity of aerogel applications, ensures the high elasticity of graphene, has excellent deformation characteristics at low temperatures, ensures graphene low temperature performance stability, and provides a excellent idea for the low volume lift of space equipment and the folding and stretching under space. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the elastic structure, involving (ia) casting graphene oxide film having a orientation degree of more than 95% using a graphene oxide solution, and the size of graphene oxide is more than 20 mu m, and carrying out chemical reduction using hydroiodic acid so that the oxygen content is less than 10 wt.%, and (ib) heating at 1400-1800 degrees C at 2-20 degrees C/minute and performing high-temperature treatment to obtain an aerogel film, or (iia) preparing graphene oxide nanofilm, where the number of layers in the thickness direction is 90-300, and (iib) placing the nanofilm in a poor solvent, uniformly dispersing and obtaining an aerogel film having a solid density of greater than or equal to 50 mg/ml after lyophilization.