In this work, C@Fe3O4 magnetic microspheres were designed and prepared by a novel strategy, and the microwave absorption properties of the materials were investigated. Four kinds of monodisperse P(MAA/St) microspheres with different carboxyl content were synthesized via facile dispersion polymerization. The Fe3O4 nanoparticles were grown on the surface of P(MAA/St) to obtain P(MAA/St)@Fe3O4 microspheres. Using P(MAA/St)@Fe3O4 as the precursors, after vacuum carbonization, C@Fe3O4 were obtained. It was observed that the carboxyl content on the microspheres’ surface increased with the increasing of MAA, which made the magnetic content and maximum specific saturation magnetization of P(MAA/St)@Fe3O4 and C@Fe3O4 increase. The obtained four kinds of C@Fe3O4 microspheres had a particle size range of 4–6 μm. The microwave absorption properties indicated that the magnetic content made a difference to the microwave absorption properties of C@Fe3O4 magnetic microspheres. The microwave absorption properties of materials were determined by controlling dielectric loss, magnetic loss and impedance matching. C@Fe3O4 microspheres exhibited excellent microwave absorption properties. The maximum reflection loss could reach −45.6 dB at 12.8 GHz with 3 mm in thickness. The effective bandwidth was 5.9 GHz with RL < −10 dB. Therefore, C@Fe3O4 microspheres were lightweight and efficient microwave absorption materials.
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机译：在这项工作中，以一种新颖的策略设计和制备了C @ Fe3O4磁性微球，并研究了材料的微波吸收特性。通过简便的分散聚合反应合成了四种羧基含量不同的单分散P（MAA / St）微球。将Fe3O4纳米粒子生长在P（MAA / St）@ Fe3O4微球上。以P（MAA / St）@ Fe3O4为前驱体，真空碳化后，得到C @ Fe3O4。观察到随着MAA的增加，微球表面的羧基含量增加，这使得P（MAA / St）@ Fe3O4和C @ Fe3O4的磁性含量和最大比饱和磁化强度增加。获得的四种C @ Fe3O4微球的粒径范围为4–6μm。微波吸收性能表明，磁性含量与C @ Fe 3 O 4 磁性微球的微波吸收性能有所不同。通过控制介电损耗，磁损耗和阻抗匹配来确定材料的微波吸收特性。 C @ Fe 3 O 4 微球具有优异的微波吸收性能。厚度为3 mm时，最大反射损耗在12.8 GHz时可达到−45.6 dB。有效带宽为5.9 GHz，RL <-10 dB。因此，C @ Fe 3 O 4 微球是轻质高效的微波吸收材料。
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