▎ 摘　　要

NOVELTY - A carbon-based composite aerogel is prepared by performing surface adsorption of amino carbon nanotubes on graphene oxide nanosheets to realize self-assembly, and performing interface crosslinking of ferroferric oxide nanoparticles with particle size of 5-200 nm, and freeze-drying. The amino carbon nanotubes are single-walled carbon nanotubes and/or multi-walled carbon nanotubes. The ferroferric oxide nanoparticles are pre-synthesized amino-modified ferroferric oxide nanoparticles or graphene sheets in-situ co-precipitated grown ferroferric oxide nanoparticles. USE - Carbon-based composite aerogel used in heat insulation, fire protection, energy storage and mechanical devices (all claimed). ADVANTAGE - The carbon-based composite aerogel has excellent fire early warning property, and high compressibility. The fire early warning property of carbon-based composite aerogel is realized by utilizing the thermal reduction effect of the amino-carbon nanotube and the graphene oxide nanosheet, and removing functional groups at high temperature to decrease resistance, so that alarm is induced. The high compressibility of the material is achieved by the double reinforcement of carbon nanotube adsorption on the surface of graphene oxide nanosheets and cross-linking of ferroferric oxide nanoparticles at the interface, and realizing strong interaction between adjacent sheets generated by synergistic assembly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the carbon-based composite aerogel, which involves adding N-hydroxysuccinimide and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to aqueous solution of graphene oxide nanosheets to obtain mixed solution to activate the carboxy group, slowly adding to carbon nanotube dispersion, so that carbon nanotubes are adsorbed on the surface of graphene oxide nanosheets, preparing ferroferric oxide nanoparticles by performing alkaline catalysis, heating and in-situ growth of ferroferric oxide magnetic nanoparticles by co-precipitation on the edge of the graphene oxide nanosheets or exchanging silane ligands on the surface of pre-synthesized ferroferric oxide nanoparticles to obtain amino-modified ferroferric oxide nanoparticles, performing interfacial crosslinking of adjacent graphene oxide sheets through the magnetic dipole interaction between ferroferric oxide nanoparticles, adding ethylenediamine to carry out self-assembly of graphene oxide nanosheets under heating conditions, aging and freeze-drying.