Lightweight and high-efficiency microwave absorption materials with tunable electromagnetic properties is a highly sought-after goal and a great challenge for researchers. In this work, a simple strategy of confinedly implanting small NiFe₂O₄ clusters on reduced graphene oxide is demonstrated, wherein the magnetic clusters are tailored, and more significantly, the electromagnetic properties are highly tuned. The microwave absorption was efficiently optimized yielding a maximum reflection loss of –58 dB and ∼12 times broadening of the bandwidth (at –10 dB). Furthermore, tailoring of the implanted magnetic clusters successfully realized the selective-frequency microwave absorption, and the absorption peak could shift from 4.6 to 16 GHz covering 72% of the measured frequency range. The fascinating performances eventuate from the appropriately tailored clusters, which provide optimal synergistic effects of the dielectric and magnetic loss caused by multi-relaxation, conductance, and resonances. These findings open new avenues for designing microwave absorption materials in future, and the well-tailored NiFe₂O₄-rGO can be readily applied as a multi-functional microwave absorption material in various fields ranging from civil and commerce to military and aerospace.

中文翻译：

---

有限植入的NiFe 2 O 4 -rGO：团簇剪裁和高度可调的电磁特性，用于选择频率的微波吸收

具有可调节的电磁性能的轻量级和高效率的微波吸收材料是人们追求的目标，对研究人员来说是一个巨大的挑战。在这项工作中，一个简单的策略是有限地注入小的NiFe ₂ O _4。演示了在还原的氧化石墨烯上形成的团簇，其中定制了磁团簇，更重要的是，对电磁性能进行了高度调整。有效地优化了微波吸收，产生了–58 dB的最大反射损耗，带宽扩展了约12倍（–10 dB）。此外，对植入的磁团簇进行剪裁成功实现了选择性频率微波吸收，吸收峰可以从4.6转移到16 GHz，覆盖了测量频率范围的72％。迷人的性能来自于经过适当调整的群集，这些群集提供了由多重松弛，电导和共振引起的介电和磁损耗的最佳协同效应。这些发现为将来设计微波吸收材料开辟了新途径，₂ O ₄ -rGO可以很容易地作为多功能微波吸收材料应用于民用和商业到军事和航空航天等各个领域。