Microwave-absorbing materials with good microwave absorption performance are of great interest for military applications and human health, which is threatened by electromagnetic radiation pollution. Herein, the design and synthesis of multi-componential metal-hybridized graphene composites via freeze drying and pyrolysis of ferrocene hydrazone complex precursor are reported. Various magnetic nanoparticles are loaded on reduced graphene oxide (rGO) via controlling their pyrolysis temperature. The complex electromagnetic parameters of these hybrids are therefore regulated by the hybrid components. Among them, rGO hybridized by the sea-island-like Fe 2 O 3 /Fe 3 O 4 /FeNi 3 multi-componential metals shows a good balance of dielectric and magnetic constants. Thus, the improved impedance matching with free space brings about a superior electromagnetic wave absorption performance, especially on the effective absorption bandwidth. The minimum reflection loss (RL) of the hybrids is as low as −40.3 dB at 11 GHz with the RL bandwidth of −10 dB being 4.55 GHz (from 9.25 to 13.8 GHz).

中文翻译：

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多组分金属杂化rGO改善了阻抗匹配，从而实现了高性能的微波吸收

具有良好的微波吸收性能的微波吸收材料对于军事应用和人类健康具有极大的兴趣，电磁辐射污染威胁着这种材料。在此，报道了通过二茂铁络合物前体的冷冻干燥和热解来设计和合成多组分金属-杂交的石墨烯复合物。通过控制其热解温度，将各种磁性纳米粒子负载在还原的氧化石墨烯（rGO）上。因此，这些混合动力车的复杂电磁参数受混合动力车部件的调节。其中，rGO与海岛型Fe 2 O 3 / Fe 3 O 4 / FeNi 3多金属杂化后，介电常数和磁常数之间达到了良好的平衡。因此，改进的阻抗与自由空间的匹配带来了卓越的电磁波吸收性能，特别是在有效吸收带宽上。混合器的最小反射损耗（RL）在11 GHz时低至-40.3 dB，-10 dB的RL带宽为4.55 GHz（从9.25至13.8 GHz）。