Effect of Barium Hexaferrites and Thermally Reduced Graphene Oxide on EMI Shielding Properties in Polymer Composites

This study reports on the electrical conductivity, dielectric, and electromagnetic interferenc (EMI) shielding properties of conductive epoxy/PAni blend containing various concentrations. Polyaniline (PAni) was synthesized using oxidative chemical polymerization technique and then dispersed into epoxy resin using a sonication bath. Infrared spectra confirm the curing of composites. Increasing the aspect ratio of PAni in epoxy increased the electrical conductivity and improves the microwave absorption properties of composites in the microwave range (0.1 GHz–20 GHz). Electrical conductivity was measured by using the four-probe method, and the maximum conductivity of the composite was achieved 3.51 × 10−13 Scm−1 with 30 wt% of PAni. The maximum porosity of the composite with 30 wt% of PAni was 15.5%. EMI shielding was measured by a vector network analyzer (VNA) in the microwave region (0.1 GHz–20 GHz), which gives the maximum value of 63 dB. IR shielding was measured by IR spectroscopy and less than 0.5% transmission was observed in NIR (700 nm–2500 nm) region. The average particle size of PAni is found to be 113 nm. These composites were used as a potential candidate for conductive coatings, EMI shielding purposes, and electronic applications.

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“…The following equations were used to calculate shielding effectiveness through scattering parameters taken from VNA. 33,42–44 …”

Section: Resultsmentioning

confidence: 99%

Electrically conductive epoxy/polyaniline composite fabrication and characterization for electronic applications

Rashid

Tariq

Shakir

et al. 2021

Journal of Reinforced Plastics and Composites

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“…The concentration of TRG was from 0 to 5.5 vol% where the maximum total shielding effectiveness was achieved as 32 dB at 5.5 vol% while keeping the sample thickness as 2 mm [ 152 ]. Zubair et al [ 153 ] synthesized thermally reduced graphene oxide (TRGO) and barium hexaferrite (BaFe) with thermoplastic TPU via the solution casting method. While keeping the sample thickness as 0.25 mm, EMI shielding effectiveness of -61 dB was achieved at 12.5 GHz frequency.…”

Section: Polymer-based Compositesmentioning

confidence: 99%

Graphene and Iron Reinforced Polymer Composite Electromagnetic Shielding Applications: A Review

et al. 2021

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With advancements in the automated industry, electromagnetic inferences (EMI) have been increasing over time, causing major distress among the end-users and affecting electronic appliances. The issue is not new and major work has been done, but unfortunately, the issue has not been fully eliminated. Therefore, this review intends to evaluate the previous carried-out studies on electromagnetic shielding materials with the combination of Graphene@Iron, Graphene@Polymer, Iron@Polymer and Graphene@Iron@Polymer composites in X-band frequency range and above to deal with EMI. VOSviewer was also used to perform the keyword analysis which shows how the studies are interconnected. Based on the carried-out review it was observed that the most preferable materials to deal with EMI are polymer-based composites which showed remarkable results. It is because the polymers are flexible and provide better bonding with other materials. Polydimethylsiloxane (PDMS), polyaniline (PANI), polymethyl methacrylate (PMMA) and polyvinylidene fluoride (PVDF) are effective in the X-band frequency range, and PDMS, epoxy, PVDF and PANI provide good shielding effectiveness above the X-band frequency range. However, still, many new combinations need to be examined as mostly the shielding effectiveness was achieved within the X-band frequency range where much work is required in the higher frequency range.

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“…Nanoparticles such as TiO 2 , rGO, SiO 2 , ZnO, and CNT could dictate research and application areas in the near future 184 with the potential to be functionalized, achieving higher level of performance, including waterproofing, fire retardancy, antibacterial resistance, UV‐protection capability, insulation, self‐cleaning, and others. Also, different forms of carbon‐based elements including nanotubes, fibers, expanded graphite, flexible graphite, graphene, and reduced graphene oxide (RGO) have been widely used to develop hybrid nanocomposites due to their cost‐effectiveness and easy synthesis and processing 185,186 . Expansion of the surface areas of such particles helps in improving the bonding with the grains of the hosting matrix.…”

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

Progress and challenges in sustainability, compatibility, and production of eco‐composites: A state‐of‐art review

Nassar

Alzebdeh

Pervez

et al. 2021

J of Applied Polymer Sci

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Owing to economic and environmental benefits, new generations of materials/commodities follow “from waste to wealth” strategy. Recently, there has been a huge upsurge in research on the development of eco‐composites using recycled plastic polymers and agro‐residues because the eco‐composites satisfy the stringent environment regulations and are cost‐effective. Herein, we present a detailed review on the potential use of several types of natural fillers as an efficient reinforcement for recycled plastic polymers. In particular, the characterization of different categories of eco‐composites according to their morphological, physical, thermal, and mechanical properties is extensively reviewed and their results are analyzed, compared, and highlighted. Furthermore, a framework to produce functional eco‐composites, which includes functionalization of ingredients, critical issues on microstructural parameters, processing, and fabrication methods, is outlined and supported with sufficient data from the literature. Finally, the review outlines the emerging challenges and future prospects of eco‐composites to be addressed by interested researchers to bridge the gap between research and commercialization of such a class of material. Overall, the acquired knowledge will guide researchers, scientists, and manufacturers to plan, select, and develop various forms of eco‐composites with enhanced properties and optimized production processes.

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Effect of Barium Hexaferrites and Thermally Reduced Graphene Oxide on EMI Shielding Properties in Polymer Composites

Cited by 27 publications

References 34 publications

Electrically conductive epoxy/polyaniline composite fabrication and characterization for electronic applications

Electrically conductive epoxy/polyaniline composite fabrication and characterization for electronic applications

Graphene and Iron Reinforced Polymer Composite Electromagnetic Shielding Applications: A Review

Progress and challenges in sustainability, compatibility, and production of eco‐composites: A state‐of‐art review

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