• Single-atom Fe–N₄ sites embedded into graphene were successfully synthesized to exert the dielectric properties of graphene.

• The absorption mechanisms of metal-nitrogen doping reduced graphene oxide mainly include enhanced dipole polarization, interface polarization, conduction loss and defect-induced polarization.

• Excellent reflection loss of − 74.05 dB (2.0 mm) and broad effective absorption bandwidth of 7.05 GHz (1.89 mm, with filler loading only 1 wt%) were obtained.

中文翻译：

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原子 Fe–N-RGO 上的电性能和极化损耗调制的积分提高电磁波吸收能力

• 
  成功合成了嵌入石墨烯中的单原子 Fe-N₄ 位点，以发挥石墨烯的介电性能。

• 
  金属氮掺杂还原氧化石墨烯的吸收机制主要包括增强偶极子极化、界面极化、传导损耗和缺陷诱导极化。

• 
  获得了 − 74.05 dB （2.0 mm） 的出色反射损耗和 7.05 GHz（1.89 mm，填料负载量仅为 1 wt%）的宽有效吸收带宽。