“…The experimental measurements of the EMI-SE were carried out on the synthetized films by using an open-ended coaxial waveguide technique (see Figure 6a). 53 Moreover, the rectangular waveguide method was also applied to verify the validity of the obtained measurements in the X-band frequency range (see Figure 6b). Figure 6.Measurement setup for EMI-SE of PPy-Ag composite films: (a) open-ended coaxial waveguide measurement and (b) rectangular waveguide measurement.…”
Section: Resultsmentioning
confidence: 95%
“…In our approach, the SEt can be associated with the insertion loss (IL) of the sample, which is placed between the source and signal analyzer and evaluated by subtracting the total shielding calculated with the reference sample and with the load sample, 53 respectively. The case of reference was applied to remove the effect of open-ended coaxial waveguide since the model should only determine the effect of the sample to estimate the shielding effectiveness.…”
Section: Resultsmentioning
confidence: 99%
“…The experimental measurements of the EMI-SE were carried out on the synthetized films by using an open-ended coaxial waveguide technique (see Figure 6a). 53 Moreover, the rectangular waveguide method was also applied to verify the validity of the obtained measurements in the Xband frequency range (see Figure 6b).…”
Section: Electrical Conductivity and Electromagnetic Shielding Perfor...mentioning
The conventional electromagnetic interference (EMI) shielding materials are being gradually replaced by a new generation of supported conducting polymer composites (CPC) films due to their many advantages. This work presents a contribution on the effects of silane surface–modified flexible polypyrrole-silver nanocomposite films on the electromagnetic interference shielding effectiveness (EMI-SE). Thus, the UV-polymerization was used to in-situ deposit the PPy-Ag on the biaxial oriented polyethylene terephthalate (BOPET) flexible substrates whose surfaces were treated by 3-aminopropyltrimethoxysilane (APTMS). X-ray Photoelectron Spectroscopy (XPS) analyzes confirmed the APTMS grafting procedure. Structural, morphological, thermal, and electrical characteristics of the prepared films were correlated to the effect of substrate surface treatment. Thereafter, EMI-SE measurements of the elaborated films were carried out as per ASTM D4935 standard for a wide frequency band extending from 50 MHz to 18 GHz. The obtained results confirmed that the APTMS-treated BOPET film exhibit higher EMI shielding performance and better electrical characteristics compared to the untreated film. In fact, a 32% enhancement of EMI-SE was noted for the treated films compared to the untreated ones. Overall, these results put forward the role played by the surface treatment in strengthening the position of flexible PPy-Ag supported films as high-performance materials in electronic devices and electromagnetic interference shielding applications.
“…The experimental measurements of the EMI-SE were carried out on the synthetized films by using an open-ended coaxial waveguide technique (see Figure 6a). 53 Moreover, the rectangular waveguide method was also applied to verify the validity of the obtained measurements in the X-band frequency range (see Figure 6b). Figure 6.Measurement setup for EMI-SE of PPy-Ag composite films: (a) open-ended coaxial waveguide measurement and (b) rectangular waveguide measurement.…”
Section: Resultsmentioning
confidence: 95%
“…In our approach, the SEt can be associated with the insertion loss (IL) of the sample, which is placed between the source and signal analyzer and evaluated by subtracting the total shielding calculated with the reference sample and with the load sample, 53 respectively. The case of reference was applied to remove the effect of open-ended coaxial waveguide since the model should only determine the effect of the sample to estimate the shielding effectiveness.…”
Section: Resultsmentioning
confidence: 99%
“…The experimental measurements of the EMI-SE were carried out on the synthetized films by using an open-ended coaxial waveguide technique (see Figure 6a). 53 Moreover, the rectangular waveguide method was also applied to verify the validity of the obtained measurements in the Xband frequency range (see Figure 6b).…”
Section: Electrical Conductivity and Electromagnetic Shielding Perfor...mentioning
The conventional electromagnetic interference (EMI) shielding materials are being gradually replaced by a new generation of supported conducting polymer composites (CPC) films due to their many advantages. This work presents a contribution on the effects of silane surface–modified flexible polypyrrole-silver nanocomposite films on the electromagnetic interference shielding effectiveness (EMI-SE). Thus, the UV-polymerization was used to in-situ deposit the PPy-Ag on the biaxial oriented polyethylene terephthalate (BOPET) flexible substrates whose surfaces were treated by 3-aminopropyltrimethoxysilane (APTMS). X-ray Photoelectron Spectroscopy (XPS) analyzes confirmed the APTMS grafting procedure. Structural, morphological, thermal, and electrical characteristics of the prepared films were correlated to the effect of substrate surface treatment. Thereafter, EMI-SE measurements of the elaborated films were carried out as per ASTM D4935 standard for a wide frequency band extending from 50 MHz to 18 GHz. The obtained results confirmed that the APTMS-treated BOPET film exhibit higher EMI shielding performance and better electrical characteristics compared to the untreated film. In fact, a 32% enhancement of EMI-SE was noted for the treated films compared to the untreated ones. Overall, these results put forward the role played by the surface treatment in strengthening the position of flexible PPy-Ag supported films as high-performance materials in electronic devices and electromagnetic interference shielding applications.
“…Equation (2) illustrates the expression of a material's SE (Shielding Effectiveness) as the summation of three distinct terms, with each term corresponding to one of the phenomena: reflection loss, absorption loss, and the cumulative impact of multiple reflections. 26 …”
Section: Theory Of Microwave Absorption and Shieldingmentioning
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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