▎ 摘　　要

NOVELTY - Preparing self-assembled three-dimensional graphene macroscopic powder absorbent, involves placing 2-4 mg/mL graphene oxide solution in cell crushing instrument to be crushed under certain power, and cooling in ice water mixture. The solution is heated at 150-190 degrees C and naturally cooled to obtain oxidized graphene hydrogel. The graphene oxide gel freeze-dried until the weight is not changed and the ice is completely removed. The freeze-dried sample is added dropwise into an alumina crucible, covered and fixed into the quartz tube reactor. USE - Method used for preparing self-assembled three-dimensional graphene macroscopic powder absorbent used in electromagnetic wave at a low frequency band of 2-6 gigaHertz. ADVANTAGE - The method enables to prepare self-assembled three-dimensional graphene macroscopic powder absorbent that has good application prospect in the field of electromagnetic wave absorption, in a simple, convenient and highly pure manner. DETAILED DESCRIPTION - Preparing self-assembled three-dimensional graphene macroscopic powder absorbent, involves placing 2-4 mg/mL graphene oxide solution in cell crushing instrument to be crushed under certain power, and cooling in ice water mixture. The solution is heated at 150-190 degrees C and naturally cooled to obtain oxidized graphene hydrogel. The graphene oxide gel freeze-dried until the weight is not changed and the ice is completely removed. The freeze-dried sample is added dropwise into an alumina crucible, covered and fixed into the quartz tube reactor. The protective gas is passed at the holding temperature to discharge the air in quartz tube. The temperature of the furnace is raised at 10 degrees C/minute for 55-60minutes until the temperature is 600-900 degrees C. The reducing gas is introduced at the preservation temperature. Heating is stopped and protective gas is introduced and the sample is naturally cooled to obtain three-dimensional macroscopic body reducing graphene oxide sample. The obtained three-dimensional reduced grained graphene macromolecule grinding is carried out to ensure that the powder particle size is 90% at 300 plus minus 150 mu . The three-dimensional reduced grained graphene macromolecules are obtained by the natural cooling of the sample and the self-assembled three-dimensional graphene macromolecular powder absorber is obtained.