▎ 摘　　要

NOVELTY - Preparing three-metal-organic framework (FeCoNi-MOFs) derived iron-cobalt-nickel alloy/carbon/graphene ultra-thin wave-absorbing material involves taking 1 of 150mL beaker, adding 60mL N, N-dimethyl formamide (DMF), 3.6mL deionized water(H2O) and 3.6mL ethanol (C2H5OH), mixing uniformly, stirring while adding a certain mass(respectively 33.6mg 50.4mg, 67.2mg, 84mg,100.8mg) of graphite oxide, ultrasonic 1.5 hours, stirring for 0.5 hours, preparing into a certain concentration of graphene oxide (GO) dispersion, adding 1.0mmol of ferric nitrate nonahydrate (Fe (NO3) 3 asterisk 9H2O) respectively the obtained GO dispersion, 1.0mmol cobalt nitrate hexahydrate (Co (NO3) 2 asterisk 6H2O) and1.0mmol nickel nitrate hexahydrate (Ni (NO3) 2 asterisk6H2O), vigorously stirring to completely dissolve to obtain the mixed dispersion, adding 1.5mmol of trimesic acid (H3BTC) to the obtained mixed dispersion solution, vigorously stirring to completely dissolve, continuously stirring for 2 hours. USE - Method for preparing three-metal-organic framework (FeCoNi-MOFs) derived iron-cobalt-nickel alloy/carbon/graphene ultra-thin wave-absorbing material. ADVANTAGE - The method is green and environment-friendly, no toxic by-product generated, the preparation technique is simple, the effective absorption bandwidth reaches 5.2GHz, has important application value in the field of electromagnetic wave absorption and electromagnetic shielding. DETAILED DESCRIPTION - Preparing three-metal-organic framework (FeCoNi-MOFs) derived iron-cobalt-nickel alloy/carbon/graphene ultra-thin wave-absorbing material involves taking 1 of 150mL beaker, adding 60mL N, N-dimethyl formamide (DMF), 3.6mL deionized water(H2O) and 3.6mL ethanol (C2H5OH), mixing uniformly, stirring while adding a certain mass (respectively 33.6mg 50.4mg, 67.2mg, 84mg,100.8mg) of graphite oxide, ultrasonic 1.5 hours, stirring for 0.5 hours, preparing into a certain concentration of graphene oxide (GO) dispersion, adding 1.0mmol of ferric nitrate nonahydrate (Fe (NO3) 3 asterisk 9H2O) respectively the obtained GO dispersion, 1.0mmol cobalt nitrate hexahydrate (Co (NO3) 2 asterisk 6H2O) and1.0mmol nickel nitrate hexahydrate (Ni (NO3) 2 asterisk6H2O), vigorously stirring to completely dissolve to obtain the mixed dispersion, adding 1.5mmol oftrimesic acid (H3BTC) to the obtained mixed dispersion solution, vigorously stirring to completely dissolve, continuously stirring for 2 hours. The mixed dispersion is transferred to the high pressure kettle with volume of the polytetrafluoroethylene lining is 100mL, solvent thermal reaction at 150 degrees C for 24 hours, after finishing reaction, cooling to room temperature, repeatedly using DMF and absolute ethyl alcohol centrifugal washing, collecting precipitate, transferring the collected precipitate to a vacuum drying box, vacuum drying at 55 degrees C for 24 hours to constant weight, to the precursor. The thermal annealing treatment to the precursor is performed at high temperature in the tubular furnace under the argon atmosphere, the temperature is 700 degrees C, the heating speed is 5 degrees C/minute, the heat preservation time is 2 hours, cooled to room temperature to obtain the final product, where the composite material is composed of the porous carbon frame of the folded graphene winding regular octahedron.