Abstract
Combining graphene with magnetic nanoparticles (NPs) can significantly improve electromagnetic wave (EMW) absorption properties compared to single counterparts. However, the magnetic NPs are easily oxidized upon exposure to air for a long time, resulting in their inferior stability. Herein, we designed and synthesized N-doped graphene-coated Fe3C yolk-shelled nanoparticles on the graphene sheets (Fe3C@NC/G). The diameter of the yolk is around 9.41 nm, while the thickness of the NC shell is about 3.0 nm. Due to the unique structure and small sized yolk-shelled NPs, the Fe3C@NC/G exhibits excellent EMW absorption property with a minimal reflection loss of −40.05 dB as the matching thickness is 2.1 mm, superior to most reported graphene-based materials. Experimental results and Density Functional Theory (DFT) calculation demonstrate that the special yolk-shelled nanostructure, abundant defects and the interfaces between Fe3C nanoparticles and N-doped graphene layer are responsible for the enhanced EMW absorption property of Fe3C@NC/G. This study provides an efficient way for development of high-performance EMW absrobers based on graphene and magnetic nanostructures.
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