In this study, the Ni/rGO hollow microspheres were synthesized and combined with epoxy foam to prepare structural absorbing materials. The diameter of obtained rGO hollow microspheres loaded with Ni nanoparticles was around 10 μm and the thickness of the spherical wall was about 70 nm. The Ni/rGO/EP composite foam exhibited better microwave absorption properties than that of rGO/EP and Ni/EP composite foam. The minimum reflection loss value (RLmin) could reach −58.23 dB at 8.4 GHz with a thickness of 2.5 mm, and the effective bandwidth with RLmin lower than −10 dB is 2.21 GHz ranging from 7.46 to 9.67 GHz. The porous structure of Ni/rGO hollow microspheres and their filled epoxy foam can refract and absorb the electromagnetic waves repeatedly, which equals to extend the propagation path of microwave, thus, electromagnetic loss capacity was improved obviously.

在这项研究中，Ni / rGO空心微球被合成并与环氧泡沫塑料结合以制备结构吸收材料。获得的负载有Ni纳米颗粒的rGO中空微球的直径为约10μm，球壁的厚度为约70nm。与rGO / EP和Ni / EP复合泡沫相比，Ni / rGO / EP复合泡沫具有更好的微波吸收性能。最小反射损耗值（RL min）在8.4 GHz时可达到-58.23 dB，厚度为2.5 mm，有效带宽为RL min低于-10 dB的是2.21 GHz，范围为7.46至9.67 GHz。Ni / rGO中空微球的多孔结构及其填充的环氧泡沫材料可以重复折射和吸收电磁波，这相当于延长了微波的传播路径，从而显着提高了电磁损耗能力。