Magnetic Fe nanoparticle to decorate N dotted C as an exceptionally absorption-dominate electromagnetic shielding material

Conversional electromagnetic shielding material with strong reflection coefficient are becoming insufficient for today's application, since the serious 2nd electromagnetic pollution. Herein, we demonstrate a magnetic carbon based shielding material constructed by magnetic Fe nanoparticles (NPs) and N dotted amorphous carbon nanosphere (~200 nm). The structure, morphology, chemical composition of the samples have been studied in depth. It is observed that the average sizes of Fe NPs is ~8.0 nm and can be loaded well on the surface of N dotted amorphous spheres. The electromagnetic shielding performance has been investigated. Significantly, the as-prepared samples show excellent electromagnetic shielding performance. The maximum shielding effectiveness can up to 30 dB under a thickness of 1.2 mm. More importantly, the reflection coefficient can be reduced to 2.3 dB, presenting excellent absorptiondominate shielding performance. The desirable shielding mechanism with less reflection are attributed to the boosted loss ability and matched impedance matching behavior, which originate from N doping and magnetic component. This work which integrates magnetic component with N dotted amorphous carbon has been demonstrated as a useful strategy for the development of absorption dominate EM shielding material.