Synergistic influence of barium hexaferrite nanoparticles for enhancing the EMI shielding performance of GNP/epoxy nanocomposites

The densely packed electronic components in electronic devices emit electromagnetic (EM) radiations, and the interaction of the emitted EM radiations with external EM signals of neighboring components leads to device malfunctions and also creates health issues in human beings. Particularly, in aircraft, EM interference is a serious threat that leads to disastrous outcomes. The shielding of electronic components is an ideal way to reduce the pollution of electromagnetic interference (EMI). The mechanism of EMI shielding efficiency is discussed elaborately in this article. The factors associated with the EMI shielding of materials are discussed in detail. The EMI shielding by reflection and absorption are two possible routes to improve the shielding performance of the shielding materials. This article also highlights the EMI shielding mechanisms by reflection and absorption. However, the risk of secondary EM pollution is associated with the reflection of EM waves. This review also outlines the methods to improve the absorption‐based shielding performance of the materials. The significance of the microstructure of the shielding materials in enhancing the absorption‐dominant shielding efficiency is also presented with a detailed analysis. This helps to fabricate the absorption‐dominant EMI shielding materials with suitable microstructures. The EM loss is associated with the magnetic, dielectric, and conduction losses according to EM theory.Highlights This article highlights the recent progress in epoxy‐based EMI shielding materials. EMI shielding mechanisms by reflection and absorption are discussed elaborately. Reviewed the methods to improve the absorption‐based shielding performance in detail. Materials with EMI shielding efficiency greater than 30 dB are highly preferable.

Section: Recent Developments In Emi Shieldingmentioning

confidence: 99%

Section: Recent Developments In Emi Shieldingmentioning

confidence: 99%

Section: Characterization Techniques Of Ep Ncs Used For Emi Shieldingmentioning

confidence: 99%

Section: Characterization Techniques Of Ep Ncs Used For Emi Shieldingmentioning

confidence: 99%

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Review on recent progress in epoxy‐based composite materials for Electromagnetic Interference(EMI) shielding applications

Albert,

Parthasarathy,

Kumar

2023

“…This is due to the fact that only minimal quantities of nanoscale fillers are necessary to achieve notable improvements in material properties. 17 Recent research has shown that residual defects and groups in rGO can enhance the impedance match characteristic and facilitate defect polarization relaxation and electronic dipole relaxation of the groups. These factors collectively contribute to the favorable absorption of EMW.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Multiwalled Carbon Nanotubes (MWCNT) and Reduced Graphene Oxide (rGO)‐based thermoplastic polyurethane and polypyrrole nanocomposites for electromagnetic wave absorption application with a low reflection

Acharya,

Swain,

Samal

et al. 2023

Electromagnetic radiation (EMR) pollution is a serious concern in today's environment, causing problems not just for electronic gadgets but also for living society. The goal of this research is to fabricate thermoplastic polyurethane (TPU) and polypyrrole (PPy)‐based 95:5 blend nanocomposites using a simple solvent casting method at such a low concentration of rGO and MWCNT (0.3, 0.4, 0.5 php) (parts per hundred polymers), for electromagnetic wave (EMW) absorption applications. The chemical interaction between the different phases and morphology of the nanocomposites is characterized by Raman spectroscopy, X‐ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) techniques. The material properties, such as dielectric and magnetic properties, are analyzed in X‐band frequency (8.2–12.4 GHz). The total shielding effectiveness of (SETot) 0.5 rGO system is found to be 27 dB, whereas, for corresponding MWCNT nanocomposites, it is 26 dB. Interestingly, in 0.5 rGO nanocomposites, absorption shielding effectiveness (SEAbs) is approximately 25 dB, and reflection shielding effectiveness (SERef) is less than 2 dB, which indicates the absorption of 70% of the electromagnetic wave, and the rest gets reflected. Apart from that, the rGO‐based nanocomposites possess a greater extent of thermal stability than the corresponding MWCNT‐based nanocomposites.Highlights Fabrication of TPU‐PPy‐rGO and TPU‐PPy‐MWCNT nanocomposites by solvent casting. Low reflection of TPU‐PPy‐rGO nanocomposites with a 70% absorption rate. FESEM confirms the multilayer interface structures. Tunable Dielectric and magnetic properties of nanocomposites in X‐band. Excellent absorption dominant properties of the fabricated nanocomposites.

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

S.,

Bose,

T. P.

2024

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