Advances in electromagnetic shielding properties of composite foams

Zhao, Biao; Hamidinejad, Mahdi; Wang, Shuai; Bai, Pengwei; Che, Renchao; Zhang, Rui; Park, Chul

doi:10.1039/d1ta00417d

Cited by 201 publications

(107 citation statements)

References 499 publications

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“…Samples were cut and trimmed into a 15.8 × 7.9 mm 2 rectangular shape to precisely fit the waveguide fixture. The reflection shielding effectiveness (SE R ) and the total shielding effectiveness (SE T ) can be determined by the following equations using S 11 and S 21 parameters [ 21 , 37 ]: where A, T and R are the absorptivity, transmissivity and reflectivity for the incident EM wave, respectively. Moreover, the absorption effectiveness of the incident wave can be described as following [ 17 , 49 ]: when the SE T is larger than 15 dB, multiple reflections (SE M ) are generally negligible.…”

Section: Methodsmentioning

confidence: 99%

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

Hamidinejad

Zhao

et al. 2021

Nano-Micro Lett.

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Lightweight, high-efficiency and low reflection electromagnetic interference (EMI) shielding polymer composites are greatly desired for addressing the challenge of ever-increasing electromagnetic pollution. Lightweight layered foam/film PVDF nanocomposites with efficient EMI shielding effectiveness and ultralow reflection power were fabricated by physical foaming. The unique layered foam/film structure was composed of PVDF/SiCnw/MXene (Ti3C2Tx) composite foam as absorption layer and highly conductive PVDF/MWCNT/GnPs composite film as a reflection layer. The foam layer with numerous heterogeneous interfaces developed between the SiC nanowires (SiCnw) and 2D MXene nanosheets imparted superior EM wave attenuation capability. Furthermore, the microcellular structure effectively tuned the impedance matching and prolonged the wave propagating path by internal scattering and multiple reflections. Meanwhile, the highly conductive PVDF/MWCNT/GnPs composite (~ 220 S m−1) exhibited superior reflectivity (R) of 0.95. The tailored structure in the layered foam/film PVDF nanocomposite exhibited an EMI SE of 32.6 dB and a low reflection bandwidth of 4 GHz (R < 0.1) over the Ku-band (12.4 − 18.0 GHz) at a thickness of 1.95 mm. A peak SER of 3.1 × 10–4 dB was obtained which corresponds to only 0.0022% reflection efficiency. In consequence, this study introduces a feasible approach to develop lightweight, high-efficiency EMI shielding materials with ultralow reflection for emerging applications.

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Section: Methodsmentioning

confidence: 99%

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

Hamidinejad

Zhao

et al. 2021

Nano-Micro Lett.

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“…Composite foams are also used to develop lightweight electromagnetic interference (EMI) shielding materials. [22][23][24][25][26][27] With the raise of electromagnetic pollution resulting from the development of gigahertz electronic systems and telecommunication devices, these new materials will be part of the next generation of PPE. The development of these novel advanced foamed materials coincides with the ongoing mutation of the foam industry.…”

Section: General Introductionmentioning

confidence: 99%

Self-foaming polymers: Opportunities for the next generation of personal protective equipment

Monie

Vidil

Grignard

et al. 2021

Materials Science and Engineering: R: Reports

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“…Recently, carbon‐filled conductive polymer composites (CPCs) with lightweight, clean processing, flexibility, corrosion resistance, and high shielding performance have become the maximum promising shielding materials. [ 1 ] The EMI SE requirements of CPCs vary with applications; however, from the economic product's viewpoint, EMI SE must be at least 20 dB·cm 3 ·g −1[ 2 ] to gain 99% attenuation of the incident electromagnetic waves. [ 3 ] Nevertheless, different processing methods restrict the prospect of certain studies.…”

Section: Introductionmentioning

confidence: 99%

Effect of in situ fibrillation on polyethylene/poly(ethylene terephthalate)/multiwalled carbon nanotube electromagnetic shielding foams

Song

et al. 2021

Polymer Engineering & Sci

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In this study, polyethylene (PP)/polyethylene terephthalate (PET)/multiwalled carbon nanotube (MWCNT) nanocomposites with nanofibrillary structure were processed by hot drawing‐assisted extrusion technology, and nonfoaming and microfoaming samples were processed by injection molding machine. Scanning electron microscope micrographs showed that when PET content was 2.5 wt%, PET fibers had a larger aspect ratio, which brought an outstanding promotion on microfoaming of PP matrix, and further details were provided by DSC and rheology analysis. When foaming sample loaded with 2.5 wt% PET and 3 wt% MWCNT, the best shielding effectiveness achieved 29.91 dB·cm3·g−1 in the test frequency range about 8.2–12.4 GHz. The results proved that the introduction of PET fibers optimized the microfoaming effect, and the uniform cell structure promoted the MWCNT dispersion and internal reflection of electromagnetic wave. Therefore, the shielding property is absorption‐dominated type and meets the requirements of lightweight and ultraefficient shielding demand of industry.

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Advances in electromagnetic shielding properties of composite foams

Abstract: In recent decades, problems with electromagnetic interference (EMI) radiation problems have arisen, that can seriously reduce the performance of precision devices nearby and threaten human health. In consequence, it is...

Cited by 201 publications

References 499 publications

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

Self-foaming polymers: Opportunities for the next generation of personal protective equipment

Effect of in situ fibrillation on polyethylene/poly(ethylene terephthalate)/multiwalled carbon nanotube electromagnetic shielding foams

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