Physics and Material Science

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Graphene@Ni0.5Co0.5Fe2O4 hybrid framework with enhanced interfacial polarization for electromagnetic wave absorption
(2021-04-14) Fatai Adisa Wahaab; Wasiu Yahya; Lawal Lanre Adebayo; Issa Kazeem; Abdulganiyu Abdulraheem; Bilal Alqasem; Jemilat Yetunde Yusuf; Abibat Asabi Adekoya; Chai Mui Nyuk
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.