Fe₃O₄ -GO 复合纳米纸的制备及吸波性能研究

In response to the requirement of light-weight absorbing materials,a new type of flexible composite buckypaper were prepared with graphene oxide (GO)buckypaper and magnetic nanoparticles (Fe₃ O₄)and acted as a lightweight electromagnetic wave absorbing material,which is expected to replace the wave-absorbing paint and simplify the molding process to realize the control of wave-absorbing performance. First, γ-aminopropyltriethoxysilane (KH-550)was used to organically modify Fe₃ O₄ nanoparticles to prepare Fe₃ O₄ -GO composite nanoparticles with uniform dispersion and electromagnetic double loss performance,and then GO and Fe₃ O₄ -GO buckypapers were prepared by solvent evaporation deposition method. The results show that NH₂ -Fe₃ O₄ is stably attached to the GO sheet. When the mass ratio of Fe₃ O₄ to GO is 4 ∶ 6,the input impedance Z_in is closest to the free space impedance Z₀,which means the impedance matching performance of the composite buckypaper is the best. Furthermore,Fe₃ O₄ -GO composite buckypaper has stronger absorbing performance than composite nanoparticles. When the mass ratio of Fe₃ O₄ to GO is 4 ∶ 6 and 5 ∶ 5,respectively,the reflection loss(RL)values are less than - 10 dB in the 2—18 GHz frequency band.