Abstract
HighlightsThe crystalline Fe/MnO@C core–shell nanocapsules embedded in porous amorphous carbon matrix (FMCA) was prepared by a novel confinement strategy of modified arc-discharge method.The heterogeneous crystalline–amorphous nanocrystals disperse evenly and exhibit improvement of static magnetization and excellent electromagnetic absorption properties.The adding MnO2 confines degree of graphitization and contributes to form amorphous carbon. Dielectric loss and microwave absorption are achieved adjustable.
Highlights
As science and technology develop dramatically fast, electromagnetic radiation pollution has become a growing problem due to the explosive growth in the application of electronic devices, such as radar systems, local area networks, telephones, and computers
The morphologies and structure are initially investigated by scanning electron microscope (SEM)
The element mapping reveals that Fe, Mn, O, and C elements are uniformly distributed in Fe/ MnO@C core–shell nanoparticles (FMCA)-1 (Fig. 1e–i)
Summary
As science and technology develop dramatically fast, electromagnetic radiation pollution has become a growing problem due to the explosive growth in the application of electronic devices, such as radar systems, local area networks, telephones, and computers. Overexposure to electromagnetic wave can affect the functioning of electronic equipment and be potentially detrimental to human being and raise severe problems concerning the field of military applications [1,2,3]. It has spurred internationally unprecedented interest in exploring microwave absorbing materials, which converts electromagnetic wave into energy in other forms [4, 5]. Massive efforts have been devoted continuously to developing absorbers, constituting carbon materials and magnetic metal iron composition recently. The multicomponent hybrids Fe@C nanocapsules [27], Fe–C nanofibers [28], graphene-coated Fe nanoparticles [29], Fe@C microspheres [1], mesoporous Fe/C composition [30], C@Fe2O3/Fe3C/ Fe–CNT nanoparticle decorated carbon nanotubes [31] display good electromagnetic absorption capabilities and wide effective frequency range to some extent
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