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Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent [email protected]γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide

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Institute of Condensed Matter and Nanosciences (IMCN), Division of Molecules, Solids and Reactivity (MOST), Place Louis Pasteur 1, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
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Department of Chemical Engineering and Biotechnology, University of Cambridge, Phillipa Fawcett Drive, West Cambridge Site, Cambridge CB3 0AS, UK
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Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, Université de Strasbourg, UMR 7504, F-67000 Strasbourg, France
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Faculty of Electrical Engineering and Computer Science & MANSiD Research Center, Stefan cel Mare University, 720229 Suceava, Romania
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Institute of Condensed Matter and Nanosciences (IMCN), Division of Bio and Soft Matter (BSMA), Croix du Sud 1, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
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Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), Place du Levant 3, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
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Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(9), 1196; https://doi.org/10.3390/nano9091196
Received: 20 July 2019 / Revised: 22 August 2019 / Accepted: 23 August 2019 / Published: 25 August 2019
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 [email protected]γ-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. View Full-Text
Keywords: magnetic nanoparticles; reduced graphene oxide; nanocomposites; microwave absorbing materials; electromagnetic interference shielding magnetic nanoparticles; reduced graphene oxide; nanocomposites; microwave absorbing materials; electromagnetic interference shielding
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MDPI and ACS Style

Mederos-Henry, F.; Mahin, J.; Pichon, B.P.; Dîrtu, M.M.; Garcia, Y.; Delcorte, A.; Bailly, C.; Huynen, I.; Hermans, S. Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent [email protected]γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide. Nanomaterials 2019, 9, 1196. https://doi.org/10.3390/nano9091196

AMA Style

Mederos-Henry F, Mahin J, Pichon BP, Dîrtu MM, Garcia Y, Delcorte A, Bailly C, Huynen I, Hermans S. Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent [email protected]γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide. Nanomaterials. 2019; 9(9):1196. https://doi.org/10.3390/nano9091196

Chicago/Turabian Style

Mederos-Henry, Francisco; Mahin, Julien; Pichon, Benoit P.; Dîrtu, Marinela M.; Garcia, Yann; Delcorte, Arnaud; Bailly, Christian; Huynen, Isabelle; Hermans, Sophie. 2019. "Highly Efficient Wideband Microwave Absorbers Based on Zero-Valent [email protected]γ-Fe2O3 and Fe/Co/Ni Carbon-Protected Alloy Nanoparticles Supported on Reduced Graphene Oxide" Nanomaterials 9, no. 9: 1196. https://doi.org/10.3390/nano9091196

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