▎ 摘　　要

NOVELTY - Honeycomb reduced graphene oxide foam/nickel nanoparticle wave absorber comprises a honeycomb-shaped reduced graphene oxide foam as a carrier and nickel nanoparticles with an average particle size of 80 nm which are anchored and supported on the reduced graphene oxide foam. USE - As honeycomb reduced graphene oxide foam/nickel nanoparticle wave absorber. ADVANTAGE - The wave absorber utilizes melamine foam as a template and own three-dimensional cross-linked network structure, reorganizes the reduced graphene oxide on its surface to give the reduced graphene oxide a three-dimensional honeycomb foam-like structure, enhances the geometric effect of the material itself, achieves multiple reflections of electromagnetic microwaves, introduces magnetic nanoparticles into the reduced graphene oxide foam material, and has more excellent wave absorption properties than single graphene or magnetic nickel, and advantages of deep wave absorption intensity, wide wave absorption frequency band, light weight and excellent mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing the wave absorber involving (1) adding ascorbic acid in a graphene oxide solution and obtaining an ascorbic acid-graphene oxide mixed solution after magnetic stirring; (2) immersing melamine foam in the ascorbic acid-graphene oxide mixed solution, repeatedly extruding and absorbing, absorbing the melamine foam, heat preserving in an oven, putting into a hydroiodic acid solution to wash off the melamine template, rinsing and centrifuging to dry to obtain reduced graphene oxide foam; (3) adding urea into deionized water and mixing evenly, gradually adding the obtained solution by dripping into the reduced graphene oxide foam obtained in step (2), drying subsequently, placing in a tube furnace after drying, and obtaining the nitrogen-doped reduced graphene oxide foam after high temperature heat treatment under gas; and (4) adding the nitrogen-doped reduced graphene oxide foam and nickel nanoparticles obtained in step (3) into deionized water and mixing uniformly, injecting the obtained mixture into the reactor to carry out high-temperature hydrothermal reaction, finishing washing, centrifuging and drying to obtain the nitrogen-doped reduced graphene oxide foam/nickel.