▎ 摘　　要

NOVELTY - Preparing polypyrrole modified silicon carbide (SiC) nanowire/graphene foam electromagnetic wave absorbing material, comprises e.g. (i) mixing graphene oxide powder into deionized water and dispersing to obtain graphene oxide dispersion liquid, (ii) adding sodium bisulfite into graphene oxide dispersion liquid and carrying out hydrothermal reaction to obtain graphene hydrogel, (iii) soaking the graphene hydrogel in nickel(II) nitrate hexahydrate aqueous solution to obtain nickel(II) nitrate containing graphene hydrogel, (iv) freezing graphene hydrogel and vacuum drying to obtain graphene foam, (v) growing the graphene foam in H2/CH3SiCl3 atmosphere to obtain SiC nano wire/graphene foam, (vi) soaking SiC nanowire/graphene foam in pyrrole solution to obtain solution containing pyrrole monomer of SiC nanowire/graphene foam, then soaking in iron (III) chloride aqueous solution and drying to obtain polypyrrole modified SiC nanowire/graphene foam electromagnetic wave absorbing material. USE - The method is useful for preparing polypyrrole modified silicon carbide nanowire/graphene foam electromagnetic wave absorbing material. ADVANTAGE - The method: solves problem of existing SiC nanowire/graphene foam realizes effective absorption of a certain band. The absorbing material realizes adjustable effective absorption of electromagnetic waves between the entire X-band and Ku-band. DETAILED DESCRIPTION - Preparing polypyrrole modified silicon carbide (SiC) nanowire/graphene foam electromagnetic wave absorbing material, comprises (i) adding graphene oxide powder into deionized water, stirring and mixing uniformly, then ultrasonically dispersing for 8-12 minutes to obtain graphene oxide dispersion liquid having concentration of 4-6 mg/ml, (ii) adding sodium bisulfite into graphene oxide dispersion liquid under stirring condition, continuously stirring for 25-35 minutes, then adding into a high-pressure reaction kettle and carrying out hydrothermal reaction at 80-100 degrees C for 8-14 hours to obtain graphene hydrogel, where the mass ratio of sodium bisulfite to graphene oxide in the graphene oxide dispersion liquid is 11:14-16, (iii) soaking the graphene hydrogel in 0.04-0.06 mol/l concentration of nickel(II) nitrate hexahydrate aqueous solution for 7 days to obtain nickel(II) nitrate containing graphene hydrogel, (iv) freezing nickel(II) nitrate containing graphene hydrogel at -20 degrees C for 10-14 hours, and then vacuum drying for 48-64 hours to obtain graphene foam, (v) growing the graphene foam in H2/CH3SiCl3 atmosphere at 1000-1100 degrees C for 1-3 hours to obtain SiC nano wire/graphene foam, where volume ratio of H2 to CH3SiCl3 in H2/CH3SiCl3 atmosphere is 1:4, (vi) adding SiC nanowire/graphene foam into pyrrole solution, soaking for 15-25 minutes to obtain solution containing pyrrole monomer of SiC nanowire/graphene foam, then adding solution containing pyrrole monomer of SiC nanowire/graphene foam into iron(III) chloride aqueous solution, soaking for 0.5-2 hours, taking out and washing using deionized water to obtain colorless clear solution, then adding in an oven and drying at 30-40 degrees C for 10-14 hours to obtain polypyrrole modified SiC nanowire/graphene foam electromagnetic wave absorbing material, where the concentration of iron(III) chloride in the FeCl3 aqueous solution is 1 mol/l.