Nanostructured composite layers for electromagnetic shielding in the GHz frequency range

Suchea, M.; Tudose, Ioan Valentin; Tzagkarakis, G.; Kenanakis, George; Katharakis, M.; Drakakis, E.; Koudoumas, E.

doi:10.1016/j.apsusc.2015.01.074

Cited by 14 publications

(6 citation statements)

References 12 publications

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“…Multiple-reflection at internal interfaces inside the material can be excluded if SE > 10 dB [70] The higher the SE the better the shielding. The SE (also denoted as SE T , with A, T, R indicating the absorption, transmission, and reflection, respectively) is usually quantified in terms of the logarithm of the incident power P inc over the transmitted power P trn [71][72][73][74][75] and thus expressed in decibels (dB).…”

Section: Emi Shielding Effectivenessmentioning

confidence: 99%

Multifunctional Carbon-Based Hybrid Foams for Shape-Stabilization of Phase Change Materials, Thermal Energy Storage, and Electromagnetic Interference Shielding Functions

Gioti

Karakassides

Asimakopoulos

et al. 2022

Micro

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Carbon-red mud foam/paraffin hybrid materials were prepared and studied for their thermal energy storage and electromagnetic interference (EMI) shielding properties. The host matrices were prepared utilizing the polymeric foam replication method, with a polyurethane sponge as a template, resin as a carbon source, and red mud as a filler. The paraffins, n-octadecane (OD) and the commercial RT18HC, were used as organic encapsulant phase change materials (PCMs) into the open pore structure of the foams. The foams’ morphological and structural study revealed a highly porous structure (bulk density, apparent porosity P > 65%), which exhibits elliptical and spherical pores, sized from 50 up to 500 μm, and cell walls composed of partially graphitized carbon and various oxide phases. The hybrid foams showed a remarkable encapsulation efficiency as shape stabilizers for paraffins: 48.8% (OD), 37.8% (RT18HC), while their melting enthalpies (ΔHm) were found to be 126.9 J/g and 115.5 J/g, respectively. The investigated hybrids showed efficient electromagnetic shielding performance in frequency range of 3.5–9.0 GHz reaching the entry-level value of ~20 dB required for commercial applications, when filled with PCMs. Their excellent thermal and EMI shielding performance places the as-prepared samples as promising candidates for use in thermal management and EMI shielding of electronic devices as well.

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Section: Emi Shielding Effectivenessmentioning

confidence: 99%

Multifunctional Carbon-Based Hybrid Foams for Shape-Stabilization of Phase Change Materials, Thermal Energy Storage, and Electromagnetic Interference Shielding Functions

Gioti

Karakassides

Asimakopoulos

et al. 2022

Micro

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“…Defined in terms of S parameters, the transmittance (T ), reflectance (R), and absorbance (A) through the shielding material can be written as follows; T = S 2 12 = S 2…”

Section: A Absorption and Electromagnetic Parametersmentioning

confidence: 99%

“…the operation of other electronic devices [1] which can cause malfunction of the devices and even can be harmful to human [2]. This is becoming a major concern, raising the need for mechanisms which shields, absorbs or protects human, environment, devices and etc.…”

mentioning

confidence: 99%

Green Nanocomposite-Based Metamaterial Electromagnetic Absorbers: Potential, Current Developments and Future Perspectives

et al. 2020

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The use of the natural materials instead of conventional materials as electromagnetic absorbers promotes environmental sustainability, cost-effectiveness, and ease of accessibility. Furthermore, these materials may also be designed as absorbers and as reinforcements in building materials in a lightweight form. The absorbing ability of composite materials can be customized based on the chosen fillers. Specifically, magnetic and dielectric fillers can be incorporated to improve the absorption of a composite material compared to traditional materials. This work aims to review recent developments of electromagnetic absorbers enabled by nanocomposites, metamaterial and metasurface-based, as well as green composite alternatives. First, the background concepts of electromagnetic wave absorption and reflection will be presented, followed by the assessment techniques in determining electromagnetic properties of absorbing materials. Next, the stateof-the-art absorbers utilizing different materials will be presented and their performances are compared. This review concludes with a special focus on the future perspective of the potential of metamaterial based nanocellulose composites as ultrathin and broadband electromagnetic absorbers. INDEX TERMS Electromagnetic, microwave absorber, nanocomposites, metamaterial, nanocellulose. I. INTRODUCTION In recent years, the development of wireless technologies with the particular aim at achieving higher communication throughput and wider bandwidths for high-speed communication have been developed rapidly to accommodate consumers' needs. However, the wide use of wireless communication systems has also resulted in an increasing electromagnetic interference (EMI) to the environment. The conducted or radiated electromagnetic signals interferes with The associate editor coordinating the review of this manuscript and approving it for publication was Kuang Zhang.

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“…These results are mainly due to the graphene nanoplatelets bi-dimensional features, that contributes to reduce the nanofillers concentration and improves the final composite shielding behavior [27]. More recently, coating nanocomposites layers based on graphene were found to have effective electromagnetic shielding, depending on their thickness and surface resistivity [28].…”

Section: Introductionmentioning

confidence: 99%

“…It is important to emphasize that due to the material used in this study, this effect is not applied. For attenuation of electromagnetic waves, it is desirable that the material has a good electrical conductivity [28].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the electromagnetic interference shielding of flexible films with reduced graphene oxide-based coatings

Godoy

Amurim

Mendes

et al. 2021

Progress in Organic Coatings

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Nanostructured composite layers for electromagnetic shielding in the GHz frequency range

Cited by 14 publications

References 12 publications

Multifunctional Carbon-Based Hybrid Foams for Shape-Stabilization of Phase Change Materials, Thermal Energy Storage, and Electromagnetic Interference Shielding Functions

Multifunctional Carbon-Based Hybrid Foams for Shape-Stabilization of Phase Change Materials, Thermal Energy Storage, and Electromagnetic Interference Shielding Functions

Green Nanocomposite-Based Metamaterial Electromagnetic Absorbers: Potential, Current Developments and Future Perspectives

Enhancing the electromagnetic interference shielding of flexible films with reduced graphene oxide-based coatings

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