Effect of cobalt ferrite concentration on the EMI shielding effectiveness of cobalt ferrite/graphene based epoxy composites

Manobalan, S and Bose, S and Sumangala, TP (2024) Effect of cobalt ferrite concentration on the EMI shielding effectiveness of cobalt ferrite/graphene based epoxy composites. In: Polymer Composites .

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Abstract

The study investigates the impact of cobalt ferrite (CF) concentration on the electrical, thermal, mechanical, magnetic, and electromagnetic interference (EMI) shielding effectiveness (SE) of Epoxy/Graphene/Cobalt ferrite composite samples. This paper presents the novel impact of agglomeration formation using an increased CF concentration, which results in the enhancement of electrical conductivity and slight decrease in EMI SE after 7 CF loading. The scanning electron micrograph provided a clear evidence for the formation of agglomeration with the increase of CF content. The amount of CF loading in Ep/Gr was varied steadily to achieve electrical percolation. The maximum tensile strength value of 21.6 MPa was observed for sample with 7 CF. The sample with 15 CF exhibited the maximum saturation magnetization of 7.5 emu/gm. TG-DTA showed thermal degradation of all samples up to 800°C. The maximum shield effectiveness (SE), 16 dB was observed for sample with 7 CF in X band and 22 dB for sample with 10 CF in Ku band frequency range. The composites exhibited great absorption properties compared to reflection in both X band Ku band frequency range. These epoxy-based composites are useful as cost effective EMI shielding material. Highlights: Hybrid filler (CF/graphene) addition alters properties of composites Structural, thermal, mechanical, electrical and, magnetic properties of composites reported Agglomeration of nanoparticles effect mechanical and EMI shielding properties. Electrical conductivity improved with filler addition The EMI Shield effectiveness is dominated by absorption loss in both X and Ku band. © 2024 Society of Plastics Engineers.

Item Type:	Journal Article
Publication:	Polymer Composites
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Keywords:	Agglomeration; Cobalt; Cost effectiveness; Dielectric properties of solids; Electric conductivity; Electromagnetic pulse; Fillers; Hybrid composites; Magnetic shielding; Saturation magnetization; Scanning electron microscopy; Solvents; Tensile strength, Band frequencies; Cobalt ferrites; Dielectrics property; Electrical conductivity; Electromagnetic interference shielding effectiveness; Ferrite loading; Ku band; Mechanical; Thermal; X bands, Electromagnetic shielding
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Sep 2024 10:33
Last Modified:	09 Sep 2024 10:33
URI:	http://eprints.iisc.ac.in/id/eprint/86060

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