Green EMI shielding: Dielectric/magnetic “genes” and design philosophy

Wang, Xi-Xi; Zheng, Qi; Zheng, Yuan-Jin; Cao, Mao‐Sheng

doi:10.1016/j.carbon.2023.02.012

Cited by 162 publications

(56 citation statements)

References 106 publications

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“…The ordered structure exhibits lower sheet resistance due to the more effective conductive networks created by the orderly arrangement of Fe NWs leading to enhanced cross-linking between the Fe NWs and improved conductivity . Additionally, the ordered structure enhances the EMI absorption efficiency of PET/Fe NWs/PEDOT thin films, making their electromagnetic shielding performance more environmentally friendly . Our findings confirm that constructing an ordered NWs structure can improve the light transmittance and EMI SE of the flexible transparent electromagnetic shielding films of metal NW.…”

Section: Resultssupporting

confidence: 73%

“…31 Additionally, the ordered structure enhances the EMI absorption efficiency of PET/Fe NWs/PEDOT thin films, making their electromagnetic shielding performance more environmentally friendly. 32 Our findings confirm that constructing an ordered NWs structure can improve the light transmittance and EMI SE of the flexible transparent electromagnetic shielding films of metal NW.…”

Section: Influence Of the Area Density And Distribution Of The Fe Nws...supporting

confidence: 79%

“…In modern flexible electronic systems, the stability of EMI shielding in the face of external disturbances is also a crucial requirement for shielding materials . Therefore, bending tests were conducted on the double-layer network structure PET/Fe NWs/PEDOT EMI films with a stagger angle of 45°, and the results are presented in Figure f.…”

Section: Resultsmentioning

confidence: 99%

“…In modern flexible electronic systems, the stability of EMI shielding in the face of external disturbances is also a crucial requirement for shielding materials. 32 Therefore, bending tests were conducted on the double-layer network structure PET/Fe NWs/PEDOT EMI films with a stagger angle of 45°, and the results are presented in Figure 5f. It is evident that after 3000 bending cycles (with a bending radius of 1cm and a frequency of 2 s/times), the EMI SE value of the films decreases by only 2.6% (97.4% of the EMI SE value is retained), indicating the excellent reliability of the EMI shielding provided by the films.…”

Section: Influence Of the Area Density And Distribution Of The Fe Nws...mentioning

confidence: 99%

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Nanostructured Films of Ordered Fe Nanowires for High-Performance Transparent Electromagnetic Interference Shielding

Yang

Ruan

et al. 2023

ACS Appl. Nano Mater.

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Although metal nanowires (NWs), such as silver NWs, are ideal materials for flexible transparent electromagnetic shielding films, the challenge of obtaining absorptive shielding films with high transmittance and shielding efficiency (SE) still exists. To address this issue, this study used iron nanowires (Fe NWs) with excellent microwave absorbing properties to construct structures with ordered NW distributions. A series of polyethylene terephthalate (PET)/Fe NWs/poly (3,4-ethylenedioxythiophene) (PEDOT) electromagnetic interference (EMI) shielding films were prepared using the magneticfield-induced orientation. The results demonstrate that the ordered Fe NW network structure can effectively overcome the problem of the trade-off between light transmittance and EMI SE. Specifically, at a Fe NW surface density of 201.78 mg/m 2 , the ordered PET/Fe NWs/ PEDOT films demonstrated a 49.06% increase in light transmittance and a 32.94% increase in EMI SE (19.37 dB), compared to the films with randomly distributed Fe NWs. Furthermore, constructing a double-layer Fe NW network with a stagger angle of 45°at the same surface density increased the EMI SE by 73.2% relative to the monolayer-ordered Fe NW structure, reaching an SE value of 33.54 dB, while maintaining almost unchanged light transmittance. Additionally, the PET/Fe NWs/PEDOT films maintain 97.4% of EMI performance after 3000 bending cycles. Overall, this study provides a new approach for creating high-performance flexible transparent EMI shielding films.

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Section: Resultssupporting

confidence: 73%

Section: Influence Of the Area Density And Distribution Of The Fe Nws...supporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Influence Of the Area Density And Distribution Of The Fe Nws...mentioning

confidence: 99%

See 2 more Smart Citations

Nanostructured Films of Ordered Fe Nanowires for High-Performance Transparent Electromagnetic Interference Shielding

Yang

Ruan

et al. 2023

ACS Appl. Nano Mater.

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“…Magnetic loss materials are commonly limited by their low stability, large density, and narrow absorption band . As is well-known, combining magnetic loss and dielectric loss could not only improve the impedance matching but also enhance the attenuation of electromagnetic waves by the materials. − The attenuation constant (α) is usually used to investigate the attenuation abilities of materials, which is related to the electromagnetic paramagnetic parameters and can be calculated with the following equation according to transmission line theory: α = 2 π f c false( μ ″ ε ″ − μ ′ ε ′ false) + ( μ ″ ε ″ − μ ′ ε ′ ) 2 + ( μ ″ ε ″ + μ ′ ε ′ ) 2 Zhang and co-workers synthesized 1D carbon/SiO 2 core–shell nanomaterials doping with Co–Fe nanoparticles by electrospinning and carbonization technique . The obtained materials delivered a compound loss, composed of magnetic loss provided by Co–Fe nanoparticle and dielectric loss provided by carbon nanofiber, thereby leading to an excellent microwave absorption performance .…”

Section: Electromagnetic Absorption Theorymentioning

confidence: 99%

Recent Progress of One-Dimensional Nanomaterials for Microwave Absorption: A Review

Wang

Zhu

Han

et al. 2023

ACS Appl. Nano Mater.

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With the increasing problems of electromagnetic interference and electromagnetic radiation, electromagnetic wave absorption (EMWA) materials have received considerable attention in civil and military fields. Among various EMWA materials, one-dimensional (1D) nanomaterials are recognized as a very promising candidate because of their unique aspect ratio, special shape anisotropy, large specific surface area, and simple manufacturing process. Herein, this paper presents a comprehensive review of recent research progress of 1D nanomaterials for EMWA applications, with a special focus on the advances in general preparation strategies and microscopic structure construction. Furthermore, the current challenge and future prospect of 1D electromagnetic absorbers are proposed, which should provide some guidelines for the design of advanced EMWA materials.

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Ultra‐Flyweight Cryogels of MXene/Graphene Oxide for Electromagnetic Interference Shielding

Ghaffarkhah

Hashemi

Rostami

et al. 2023

Adv Funct Materials

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MXene and graphene cryogels have demonstrated excellent electromagnetic interference (EMI) shielding effectiveness due to their exceptional electrical conductivity, low density, and ability to dissipate electromagnetic waves through numerous internal interfaces. However, their synthesis demands costly reduction techniques and/or pre‐processing methods such as freeze‐casting to achieve high EMI shielding and mechanical performance. Furthermore, limited research has been conducted on optimizing the cryogel microstructures and porosity to enhance EMI shielding effectiveness while reducing materials consumption. Herein, a novel approach to produce ultra‐lightweight cryogels composed of Ti3C2Tx/graphene oxide (GO) displaying multiscale porosity is presented to enable high‐performance EMI shielding. This method uses controllable templating through the interfacial assembly of filamentous‐structured liquids that are readily converted into EMI cryogels. The obtained ultra‐flyweight cryogels (3–7 mg cm−3) exhibit outstanding specific EMI shielding effectiveness (33 000–50 000 dB cm2 g−1) while eliminating the need for chemical or thermal reduction. Furthermore, exceptional shielding is achieved when the Ti3C2Tx/GO cryogels are used as the backbone of conductive epoxy nanocomposites, yielding EMI shielding effectiveness of 31.7–51.4 dB at a low filler loading (0.3–0.7 wt%). Overall, a one‐of‐a‐kind EMI shielding system is introduced that is readily processed while affording scalability and performance.

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Green EMI shielding: Dielectric/magnetic “genes” and design philosophy

Cited by 162 publications

References 106 publications

Nanostructured Films of Ordered Fe Nanowires for High-Performance Transparent Electromagnetic Interference Shielding

Nanostructured Films of Ordered Fe Nanowires for High-Performance Transparent Electromagnetic Interference Shielding

Recent Progress of One-Dimensional Nanomaterials for Microwave Absorption: A Review

Ultra‐Flyweight Cryogels of MXene/Graphene Oxide for Electromagnetic Interference Shielding

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