Lightweight Epoxy-Based Composites for EMI Shielding Applications

Banerjee, Poulami; Bhattacharjee, Yudhajit; Bose, Suryasarathi

doi:10.1007/s11664-019-07687-5

Cited by 36 publications

(28 citation statements)

References 76 publications

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“…The incident electromagnetic (EM) wave is partially reflected (R), transmitted (T) and absorbed (A) while propagating through the material. 56–58…”

Section: Resultsmentioning

confidence: 99%

“…The incident electromagnetic (EM) wave is partially reflected ðRÞ, transmitted ðT Þ and absorbed ðAÞ while propagating through the material. [56][57][58] Therefore, the EMI-SE is performed using the components of the reflection coefficients (S11 or S22) and the transmission coefficients (S21 or S12).…”

Section: Electrical Conductivity and Electromagnetic Shielding Perfor...mentioning

confidence: 99%

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Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

Benzaoui

Ales

Mekki

et al. 2021

High Performance Polymers

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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.

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“…The incident electromagnetic (EM) wave is partially reflected (R), transmitted (T) and absorbed (A) while propagating through the material. 56–58…”

Section: Resultsmentioning

confidence: 99%

Section: Electrical Conductivity and Electromagnetic Shielding Perfor...mentioning

confidence: 99%

Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

Benzaoui

Ales

Mekki

et al. 2021

High Performance Polymers

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“…To counter this, microwave absorbers find their place in various applications, e.g., achieving electromagnetic interference (EMI) shielding, − sophisticated contact lenses, and improving detector sensitivity . In light of the widespread use of numerous optoelectronic devices such as wearable sensors and smartphones and the other associated complex electromagnetic instruments, EMI shielding technology has been becoming even more essential in recent years. ,− …”

Section: Introductionmentioning

confidence: 99%

“…In modern times with the state of the art electronic equipment and devices, we are in the race for slimmer and slicker devices which are easy to fabricate and possess several other qualities such as being lightweight, flexible, and high-strength. Polymer nanocomposites with embedded conducting, magnetic, or hybrid nanostructures as fillers have become a prevalent substitute for EM shield because of better processability and enhanced scalability. , Recent work in EMI shielding and radio frequency/extremely low-frequency interference screening is in fact shifting toward designing more and more hybrid functional materials which have versatile properties in a single framework. Core–shell nanocomposite materials are one of the lucrative and effective hybrid materials to look for.…”

Section: Introductionmentioning

confidence: 99%

Core–Shell Nanomaterials for Microwave Absorption and Electromagnetic Interference Shielding: A Review

Bhattacharjee

Bose

2021

ACS Appl. Nano Mater.

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142

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Core–shell nanoparticles are a unique class of nanostructured materials, which received significant attention in the last two decades owing to their exciting properties and a wide variety of applications. By judiciously tuning the “core” as well as the “shell”, an assortment of “core–shell” nanostructures can be obtained with tailorable properties which can play pivotal roles in designing materials for electromagnetic interference (EMI) shielding and microwave absorption. In recent times when the use of high-end electronics has been on the rise, electromagnetic pollution is inevitable and it affects every walk of life. Among numerous e-pollutions, a recently highlighted domain that has far-reaching consequences is electromagnetic interference. EMI is the disturbance created during an electronic device’s operation when it is in the vicinity of an electromagnetic field caused by another electronic or electric device. Since EMI decreases the lifetime and degrades the performance of the electronic instruments and even affects human health, it is crucial to protect sophisticated instruments and components from EM interference. High-performance EMI shields capable of attenuating microwave propagation efficiently have been developed in the past decade. Herein, in this review, we attempted to provide a logical guide to various “core–shell” nanostructures (≤500 nm) that have been synthesized in the past decade for the application in microwave absorption and EMI shielding. The prime focus of this review article is to highlight the fundamental concept of EMI shielding and microwave absorption that have been reported for various systems in the literature along with various synthetic and fabrication strategies in designing suitable broadband EM absorbers/screeners. Finally, we also made an effort to provide a holistic outlook and perspective in which upcoming research will continue to flourish.

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“…The polymer matrix can be reinforced by dispersed electrically conductive fillers, such as carbon materials (carbon fibers, carbon black, CNT, graphene) or metallic (stainless steel, copper, or aluminum) particles or fibers, creating traditional composite materials or more complex and futuristic structures with a wide range of properties, from antistatic to conductive. [ 3,6,7,12,16–27 ]…”

Section: Introductionmentioning

confidence: 99%

Effect of processing conditions on electromagnetic shielding and electrical resistivity of injection‐molded polybutylene terephthalate compounds

Martins

Barbosa²,

Silva³

et al. 2021

Polymer Engineering & Sci

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This research introduces an analysis of the anisotropic electrical resistivity (ER) and its relation to the electromagnetic shielding effectiveness (EMSE) for two injection‐molded carbon‐fiber‐reinforced polybutylene terephthalates (PBTs). The properties were measured for 2‐mm thick injection moldings considering the effect of melt temperature, injection velocity, and flow distance. The results for one compound showed an EMSE in the range of 30–40 dB, while EMSE for a compound with lower filler content is in the range of 45–75 dB. A combination of higher temperature and higher velocity leads to an increase of EMSE for both compounds in the range of 3%–8.5%. However, the increase in flow path reduced the EMSE for both compounds up to 10%. A novel experimental apparatus was used to measure the anisotropic ER in the three directions, that is, parallel, perpendicular, and transversal to flow. It is evident that injection molding induced high anisotropy for both compound specimens, and, depending on the processing conditions, produced similar longitudinal resistivity (0.2–4 Ω.cm) but higher transversal resistivity (8–22 Ω.cm). ER properties were compared with EMSE, evidencing an inverse relation as expected. Furthermore, it was found that the longitudinal resistivity is the main contributor to the specimens shielding.

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Lightweight Epoxy-Based Composites for EMI Shielding Applications

Cited by 36 publications

References 76 publications

Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

Core–Shell Nanomaterials for Microwave Absorption and Electromagnetic Interference Shielding: A Review

Effect of processing conditions on electromagnetic shielding and electrical resistivity of injection‐molded polybutylene terephthalate compounds

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