Graphene@Ni0.5Co0.5Fe2O4 hybrid framework with enhanced interfacial polarization for electromagnetic wave absorption
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Date
2021-04-14
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Abstract
Fabrication of smart materials for electromagnetic (EM) wave absorption has been propounded as effi-
cient EM interference and pollution mitigation method. Herein, a porous lightweight graphe-
ne@Ni 0.5 Co 0.5 Fe 2 O 4 composite was prepared via a coprecipitation method. The results show that
Ni 0.5 Co 0.5 Fe 2 O 4 nanoparticles are homogeneously dispersed and anchored on the graphene flakes.
Investigation of the EM waves absorption properties of the material at different filling in paraffin reveals
that at 15 wt% loading, the composite absorbs large percent of the EM waves at minimal thickness. The
composite attains optimum reflection loss peak 44.7 dB at 17.45 GHz, with 1.5 mm thickness. This
enhanced EM wave absorption performance (at lesser thickness than Ni 0.5 Co 0.5 Fe 2 O 4 in literature) could
be ascribed to interfacial polarization and a good impedance match arising from unique pore configu-
ration of the dielectric (graphene) and magnetic (Ni 0.5 Co 0.5 Fe 2 O 4 ) composite. These results indicate that
the lightweight G@Ni 0.5 Co 0.5 Fe 2 O 4 composites with strong absorption at reduced thickness is an efficient
absorber for high-frequency EM wave attenuation.
Description
Graphene