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Electromagnetic shielding in the X-band of composites based on 3D carbon structures using reticulated vitreous carbon and epoxy resin

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Abstract

Currently, the use of electro-electronic equipment has been growing, with the consequent increase in electromagnetic pollution, harmful to the environment and living beings. Materials can mitigate this type of problem, seeking to combine, whenever possible, lighter and corrosion-resistant materials, replacing metallic materials. The present work studied the electromagnetic behavior in the X-band (8.2–12.4 GHz) of polymeric composites based on a 3D-carbon structure, named reticulated vitreous carbon (RVC) and epoxy resin (EP). RVC samples with different porosities (10, 30, 45, and 60 pores per inch, ppi) heat-treated at 1000 °C were used. Electrical conductivity measurements showed for the 30–60 ppi RVC samples high electrical conductivity values (~ 1–2 × 102 S/m) and the CVR/epoxy composites show a more insulating behavior (~ 0.1–1.4 × 10–1 S/m), due to the influence of the EP. The electromagnetic characterization showed the variation of the complex components of electrical permittivity and magnetic permeability as a function of the CVR porosity and, consequently, on the electromagnetic shielding (SE) behavior. SE values of up to ≈ 99.5% of incident radiation were obtained for the 60 ppi-RVC/EP composite, which has a greater number of alveoli per inch and a greater number of carbon struts. It was determined that wave energy losses in the composites occurred primarily by absorption, followed by reflection. In summary, all composites showed good total SE values (15.8–25.2 dB), indicating their potential use in different applications.

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Acknowledgements

The authors acknowledge the Brazilian Funding Institutions CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Project: 305123/2018-1) and FAPESP (Fundação de Apoio à Pesquisa do Estado de São Paulo, Project: 2018/09531-2) for their financial support.

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Authors and Affiliations

  1. Polymer and Biopolymer Technology Laboratory (TecPBio), Federal University of São Paulo (UNIFESP), 330 Talim St., São José dos Campos, SP, 12231-280, Brazil

    Fabiano da Silva Dias, Bruno Ribeiro, Larissa Stieven Montagna & Mirabel Cerqueira Rezende

  2. Laboratório de Estruturas Leves (LEL), Instituto de Pesquisas Tecnológicas (IPT), Estrada Dr. Altino Bondensan, 500 - Eugênio de Melo, São José dos Campos, SP, 12247-016, Brazil

    Bruno Ribeiro

  3. Associated Laboratory of Sensors and Materials (LAS), National Institute for Space Research (INPE), Av. dos Astronautas, 1.758, São José dos Campos, SP, 12227-010, Brazil

    Maurício Ribeiro Baldan & Newton Adriano Santos Gomes

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  1. Fabiano da Silva Dias
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Contributions

FSD, LSM and MCR contributed to conceptualization. FSD, LSM and BR performed data curation, investigation and writing—original draft. Newton Adriano Santos Gomes carried out formal analysis. MCR and MRB contributed to funding acquisition. FSD, BR, NASG and LSM provided methodology. MCR was involved in project administration and supervision. MCR and MRB provided resources. FSD and LSM performed validation and visualization. FSD, LSM, BR and MCR performed writing—review and editing.

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Correspondence to Larissa Stieven Montagna.

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da Silva Dias, F., Ribeiro, B., Baldan, M.R. et al. Electromagnetic shielding in the X-band of composites based on 3D carbon structures using reticulated vitreous carbon and epoxy resin. J Mater Sci: Mater Electron 34, 236 (2023). https://doi.org/10.1007/s10854-022-09576-w

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