Highly EfficientWideband Microwave Absorbers Based on Zero-Valent Fe@ -Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide

Mederos Henry, Francisco;Mahin, Julien;Pichon, Benoît P.;Dîrtu, Marinela;Hermans, Sophie;et.al.
(2019) Nanomaterials — Vol. 9, n° 1196, p. 1-19 (2019)

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  • Mederos Henry, Franciscoorcid-logoUCLouvain
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  • Mahin, JulienDepartment of Chemical Engineering and Biotechnology, University of Cambridge, Phillipa Fawcett Drive, West Cambridge Site, Cambridge CB3 0AS, UK
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  • Pichon, Benoît P.Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, Université de Strasbourg, UMR 7504, F-67000 Strasbourg, France
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  • Dîrtu, MarinelaFaculty of Electrical Engineering and Computer Science & MANSiD Research Center, Stefan cel Mare University, 720229 Suceava, Romania
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  • Garcia, Yannorcid-logoUCLouvain
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  • Delcorte, ArnaudUCLouvain
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  • Bailly, Christianorcid-logoUCLouvain
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  • Huynen, Isabelleorcid-logoUCLouvain
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  • Hermans, SophieUCLouvain
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Abstract
Electronic systems and telecommunication devices based on low-power microwaves, ranging from 2 to 40 GHz, have massively developed in the last decades. Their extensive use has contributed to the emergence of diverse electromagnetic interference (EMI) phenomena. Consequently, EMI shielding has become a ubiquitous necessity and, in certain countries, a legal requirement. Broadband absorption is considered the only convincing EMI shielding solution when the complete disappearance of the unwanted microwave is required. In this study, a new type of microwave absorber materials (MAMs) based on reduced graphene oxide (rGO) decorated with zero-valent Fe@-Fe2O3 and Fe/Co/Ni carbon-protected alloy nanoparticles (NPs) were synthesized using the Pechini sol-gel method. Synthetic parameters were varied to determine their influence on the deposited NPs size and spatial distribution. The deposited superparamagnetic nanoparticles were found to induce a ferromagnetic resonance (FMR) absorption process in all cases. Furthermore, a direct relationship between the nanocomposites’ natural FMR frequency and their composition-dependent saturation magnetization (Ms) was established. Finally, the microwave absorption efficiency (0.4 MHz to 20 GHz) of these new materials was found to range from 60% to 100%, depending on the nature of the metallic particles grafted onto rGO.
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Mederos Henry, F., Mahin, J., Pichon, B. P., Dîrtu, M., Garcia, Y., Delcorte, A., Bailly, C., Huynen, I., & Hermans, S. (2019). Highly EfficientWideband Microwave Absorbers Based on Zero-Valent Fe@ -Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide. Nanomaterials, 9(1196), 1-19. https://doi.org/10.3390 (Original work published 2019)