Study of the substrate surface treatment of flexible polypyrrole-silver composite films on EMI shielding effectiveness: theoretical and experimental investigation

Benzaoui, Karim; Ales, A.; Mekki, Ahmed; Zaoui, Abdelhalim; Bouhemadou, A.; Bouaouina, Boudjemaa; Benyoubi, Fethi

doi:10.1515/freq-2021-0219

Cited by 1 publication

(3 citation statements)

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“…The SE of a material can be also calculated by using the equation (8) below. 5 SE t ðdBÞ ¼ À20 log 10 jT j (8)…”

Section: Seðdbþmentioning

confidence: 99%

“…According to the analysis of S-parameters, transmittance (T), reflectance (R) and absorbance ( A ) through the shielding material can be described as: 5 In the order to validate the earlier equations, the RM (dB) in (2) must be negligible.…”

Section: Theory Of Microwave Absorption and Shieldingmentioning

confidence: 99%

“…To maintain an efficient and satisfactory EM environment, it is essential to develop advanced EM materials capable of dealing with external EM waves. 2,5,6 These materials fall into two categories: EM absorbing and EM shielding materials, which have different ratios of absorption and reflection. A perfect EM absorber should have a strong absorption (measured by reflection loss value (RL)) and a wide effective absorption width (denoting the region with RL < −10dB).…”

Section: Introductionmentioning

confidence: 99%

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Enhancing electromagnetic absorption in microwave of epoxy resin through incorporated surface modified aluminum oxide nanoparticles

Medjaouri,

Ales,

Mehelli

et al. 2023

High Performance Polymers

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The development of novel nanomaterials with superior reflection loss (RL), thin thickness, wide bandwidth, and low density has recently received significant attention in an effort to increase their effectiveness in electromagnetic (EM) microwave absorption while maintaining an easy manufacturing process. Naturally, using conventional materials with magnetic or dielectric loss makes it difficult to achieve the last criterion and limitations the thickness of the absorber and mass production. In this work, microwave nanocomposites samples were prepared on epoxy resin with different percentages of the nanoparticles of aluminum oxide (epoxy/Al2O3) with surfaces treated by amino propyl and silane. The surface treatment was carried out to improve the adhesion, morphology, and EM properties of the samples to enhance the microwave absorption and the Shielding Effectiveness (SE). Therefore, the treated sample can be considered as potential candidate for high frequency EM absorption applications. Then, the study is followed by structural, morphological, thermal, and electrical characterization of the prepared samples in order to enhance the performances of the latters. The EM absorption and the shielding effectiveness were done in the X band frequency (8 GHz-12 GHz). The obtained results confirmed that the nanocomposites treated samples exhibit higher EM absorption performance and better electrical characteristics. Overall, these results put forward the role played by the addition of the nanoparticles films as high-performance materials in electronic devices and EM applications.

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“…The SE of a material can be also calculated by using the equation (8) below. 5 SE t ðdBÞ ¼ À20 log 10 jT j (8)…”

Section: Seðdbþmentioning

confidence: 99%