▎ 摘　　要

NOVELTY - Preparing ultra-light graphene/multi-wall carbon nano-tube complex wave-absorbing foam comprises (1) ultrasonically dispersing raw materials including graphene oxide and carboxylated multi-walled carbon nano-tube into water, adding an alcoholic solvent, stirring uniformly to obtain a mixed solution, and adding the mixed solution in vacuum environment for static treatment to obtain a oxide/carboxylated multi-walled carbon nano-tube suspension, (2) sequentially subjecting the graphene oxide/carboxylated multi-wall carbon nano-tube suspension to orientation freezing and freeze-drying treatment to obtain graphene oxide/carboxylated multi-wall carbon nano-tube foam, and (3) subjecting graphene oxide/carboxylated multi-walled carbon nano-tube foam to thermal reduction treatment to obtain graphene/multi-walled carbon nano-tube complex wave-absorbing foam or combining the graphene/multi-wall carbon nano-tube complex wave-absorbing foam with a plastic polymer to obtain finished product. USE - The method is useful for preparing ultra-light graphene/multi-wall carbon nano-tube complex wave-absorbing foam. ADVANTAGE - The complex-absorbing foam has a directional pore structure, controllable shape and average internal diameter, low density of 0.002-1.2 g/cm3, electromagnetic wave absorption effect at 2-40 GHz, and good wave absorption performance of less than 8 dB, 10dB and 17 dB in X, Ku and Ka frequency bands, which can improve the mechanical properties. The method: is simple, economical and has and large-scale production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for ultra-light graphene/multi-wall carbon nanotube complex wave-absorbing foam.