Browsing by Author "Fatai Adisa Wahaab"

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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.
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    Graphene@Ni0.5Co0.5Fe2O4 hybrid framework with enhanced interfacial polarization for electromagnetic wave absorption
    (Elsevier Ltd, 2021-09-19) 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 efficient EM interference and pollution mitigation method. Herein, a porous lightweight graphene@ Ni0.5Co0.5Fe2O4 composite was prepared via a coprecipitation method. The results show that Ni0.5Co0.5Fe2O4 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 Ni0.5Co0.5Fe2O4 in literature) could be ascribed to interfacial polarization and a good impedance match arising from unique pore configuration of the dielectric (graphene) and magnetic (Ni0.5Co0.5Fe2O4) composite. These results indicate that the lightweight G@Ni0.5Co0.5Fe2O4 composites with strong absorption at reduced thickness is an efficient absorber for high-frequency EM wave attenuation.
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    Graphene@Ni0.5Co0.5Fe2O4 hybrid framework with enhanced interfacial polarization for electromagnetic wave absorption
    (Elsevier, 2020) 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 efficient EM interference and pollution mitigation method. Herein, a porous lightweight graphene@Ni0.5Co0.5Fe2O4 composite was prepared via a co-precipitation method. The results show that Ni0.5Co0.5Fe2O4 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 Ni0.5Co0.5Fe2O4 in literature) could be ascribed to interfacial polarization and a good impedance match arising from unique pore configuration of the dielectric (graphene) and magnetic (Ni0.5Co0.5Fe2O4) composite. These results indicate that the lightweight G@Ni0.5Co0.5Fe2O4 composites with strong absorption at reduced thickness is an efficient absorber for high-frequency EM wave attenuation. absorber for high-frequency EM wave attenuation.
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    Microwave absorption performance of Ni0.5Zn0.5Fe2O4 nanoclusters at 8.2–18 GHz frequency
    (Springer, 2022) Fatai Adisa Wahaab; Lawal Lanre Adebayo; Amir Rostami; Menaka Ganeson; Jemilat Yetunde Yusuf; Yussuf Afeez; Adebowale Martins Obalalu; Abdulganiyu Abdulraheem; Temidayo Lekan Oladosu
    The evolution of nanomaterials has significantly contributed to the advancement of smart and lightweight electromagnetic (EM) wave absorbing materials. In this study, Ni0.5Zn0.5Fe2O4 nanoclusters were synthesized by a facile co-precipitation route. The morphology, structure, phase, and chemical composition of the sample was investigated. Results show that the sample is composed of clustered Ni0.5Zn0.5Fe2O4 nanoparticles, wherein the nanoparticles clusters are composed of tiny individual particles with spherical morphology. Investigation of the EM wave absorption reveals that a composite of paraffin containing 20 wt% of the Ni0.5Zn0.5Fe2O4 nanoclusters absorbs a large percentage of the incident EM wave at a thin absorber thickness. The sample attains − 48.8 dB reflection loss at 14.42 GHz with a 3.0 mm thickness. The enhanced EM absorption performance can be ascribed to interface polarization resulting from the many active atoms on the surface of the Ni0.5Zn0.5Fe2O4 nanoclusters. These results show that the Ni0.5Zn0.5Fe2O4 nanoclusters can be used to effectively attenuate microwaves.