Structural and electromagnetic properties of Fe2Co-multi-walled carbon nanotubes-polystyrene based composite

Here, we report on the synthesis, characterization, and electromagnetic properties of the composites based on Fe2Co alloy nanoparticles, multi-walled carbon nanotubes (MWCNTs), and polystyrene (PS). The absorbing electromagnetic characteristics of Fe2Co/MWCNT-PS composites in the frequency range of...

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Bibliographic Details
Published in:	Journal of alloys and compounds Vol. 844; p. 156107
Main Authors:	Kazakova, Mariya A., Moseenkov, Sergey I., Golubtsov, Georgiy V., Korovin, Evgeniy Yu, Ishchenko, Arcady V., Selyutin, Alexander G., Zavorin, Alexey V., Zhuravlev, Viktor A., Suslyaev, Valentin I., Kuznetsov, Vladimir L.
Format:	Journal Article
Language:	English
Published:	Lausanne Elsevier B.V 05-12-2020 Elsevier BV
Subjects:	Carbonyls Chemical composition Composite structures Composites Dielectric properties Electromagnetic interference shielding Electromagnetic properties Electromagnetic shielding Fe-Co alloy Nanoparticles Frequency ranges Magnetic properties Magnetic shielding Membranes Metal surfaces Morphology Multi wall carbon nanotubes Multi-walled carbon nanotubes Multilayers Nanoalloys Nanoparticles Optimization Permeability Permittivity Polymer matrix composites Polystyrene resins Thermal decomposition Thickness Vacuum filtration Electromagnetic interference shielding Composites Permeability Multi-walled carbon nanotubes Fe-Co alloy Nanoparticles Permittivity
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Summary:	Here, we report on the synthesis, characterization, and electromagnetic properties of the composites based on Fe2Co alloy nanoparticles, multi-walled carbon nanotubes (MWCNTs), and polystyrene (PS). The absorbing electromagnetic characteristics of Fe2Co/MWCNT-PS composites in the frequency range of 1–18 GHz have been tuned by controlling their dielectric and magnetic properties. For this, Fe2Co/MWCNT hybrids with a controlled composition and particle size of the Fe2Co alloy have been obtained by thermal decomposition of iron and cobalt carbonyls on the surface of MWCNTs with subsequent production of Fe2Co/MWCNT-PS membranes by vacuum filtration. The optimization of the conditions of the Fe2Co alloy particles formation as well as the study of the structure and morphology of the hybrids and membranes based on them have been carried out using HRTEM, HAADF-STEM, SEM, XRD, and TPD. The effect of the calcination temperature on the evolution of the chemical composition, structure, size, and morphology of supported Fe2Co nanoparticles has been thoroughly studied. In order to enhance the shielding properties of the material, a multilayer composite structure has been proposed and optimized, consisting of five alternating layers of Fe2Co/MWCNT-PS membranes and dielectric layers (neat PS) localized on a metal surface. The simulation results show that the proposed five-layer material, consisting of three layers of Fe2Co/MWCNT-PS membranes with thickness of 0.1 mm and two layers of PS with thickness of 0.5 mm, shows the highest efficiency of electromagnetic interference shielding (−14.2 dB at 17.5 GHz) as compared to a similar composite consisting of MWCNT-PS membranes (−5.4 dB at 17.5 GHz). Such multilayer structure is cost-effective and lightweight, which makes it a perspective material for EMI shielding. •Fe2Co/MWCNT/polystyrene composites for EMI shielding applications were prepared.•Optimal conditions of the Fe2Co alloy particles formation by metal carbonyls were found.•Model of multilayer composite structure was proposed and optimized.•Optimal composite structure is five alternating Fe2Co/MWCNT-PS and PS layers localized on metal.•Fe2Co/MWCNT/PS composites show a minimum reflection loss value of −14.2 dB at 17.5 GHz.
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2020.156107