Development and current situation of flexible and transparent EM shielding materials

Tan, Dongchen; Jiang, Chengming; Li, Qikun; Bi, Sheng; Wang, Xiaohu; Song, Jinhui

doi:10.1007/s10854-021-05409-4

Cited by 31 publications

(15 citation statements)

References 156 publications

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“…The main shielding mechanisms are absorption (A) and reflection (R); according to the law of conservation of energy, these coefficients are related by the relation A + R + T = 1 [46]. The absorption mechanism as the main shielding mechanism is fully characteristic of graphene [47].…”

Section: Shielding Properties Of Embedded Cu Meshesmentioning

confidence: 99%

Low Cost Embedded Copper Mesh Based on Cracked Template for Highly Durability Transparent EMI Shielding Films

et al. 2022

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Embedded copper mesh coatings with low sheet resistance and high transparency were formed using a low-cost Cu seed mesh obtained with a magnetron sputtering on a cracked template, and subsequent operations electroplating and embedding in a photocurable resin layer. The influence of the mesh size on the optoelectric characteristics and the electromagnetic shielding efficiency in a wide frequency range is considered. In optimizing the coating properties, a shielding efficiency of 49.38 dB at a frequency of 1 GHz, with integral optical transparency in the visible range of 84.3%, was obtained. Embedded Cu meshes have been shown to be highly bending stable and have excellent adhesion strength. The combination of properties and economic costs for the formation of coatings indicates their high prospects for practical use in shielding transparent objects, such as windows and computer monitors.

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Section: Shielding Properties Of Embedded Cu Meshesmentioning

confidence: 99%

Low Cost Embedded Copper Mesh Based on Cracked Template for Highly Durability Transparent EMI Shielding Films

et al. 2022

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“…The rapid development of communication technology and electronic devices has inevitably led to an increase in the electromagnetic energy density in the natural environment. − This not only causes electromagnetic interference (EMI) that disrupts the functioning of electronic devices but also poses a potential risk to human health. − To eliminate the hazards of electromagnetic radiation, the use of electromagnetic shielding materials that can block radiation propagation is an effective approach. , With the rise in the use of flexible optoelectronic devices, it is essential to develop flexible, transparent, and highly efficient electromagnetic shielding materials. , Researchers have investigated several materials, such as graphene, − conductive polymers, micro-metal mesh, and metal nanowires (NWs), for developing flexible, transparent electromagnetic shielding films. Among these, metal-nanowire-based flexible transparent electromagnetic shielding films have gained significant attention due to their low cost and ease of fabrication.…”

Section: Introductionmentioning

confidence: 99%

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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“…Although the multilayer design strategy can improve the EMI SE performance to a certain extent, most EMI SE multilayer composites reported by now were only qualitatively studied through a large number of experiments, and it is often difficult to attain optimal EMI SE performance even at the cost of high experimental expense and long time. Therefore, it is necessary to fetch flexible conductive composites with both good mechanical properties and efficient EMI SE performance by at low cost and in a short time. ,− …”

Section: Introductionmentioning

confidence: 99%

Flexible Multilayered Poly(vinylidene fluoride)/Graphene-Poly(vinylidene fluoride) Films for Efficient Electromagnetic Shielding

Fang

Chen

et al. 2023

ACS Appl. Nano Mater.

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Developing flexible electromagnetic interference shielding (EMI SE) materials is an effective strategy to protect humans from being harmed by electromagnetic radiation from electronic devices. Though the EMI SE property of such materials as graphene can exceed 100 dB, it remains a challenge to achieve high-efficiency EMI SE performance while having excellent flexibility to allow them to be wearable. Herein, we designed theoretically and fabricated experimentally the flexible multilayer structure of the poly(vinylidene fluoride)/graphene-poly(vinylidene fluoride) (PVDF/GNP-PVDF) composite films. The experimental results show that the film thickness and layer number play an important role in determining the EMI SE performance, and the multilayer film with a thickness of 0.3 mm and a layer number of 6 exhibits not only high EMI SE performance (69.7 dB on average in X-band) but also excellent flexibility and stability (98.85% EMI SE retention after bending of 60° for 1000 cycles). The theoretical study via COMSOL software matching well with the experimental data reveals that multiple reflection and absorption of electromagnetic waves between layers is responsible for the high EMI SE performance of the PVDF/GNP-PVDF multilayer film at a relatively low thickness that ensures flexibility. This work highlights the significance of designing the multilayer architecture via theoretical simulation for improving the EMI SE performance and also demonstrates the high EMI SE application prospect of PVDF/GNP-PVDF films in wearable electronic devices.

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Development and current situation of flexible and transparent EM shielding materials

Cited by 31 publications

References 156 publications

Low Cost Embedded Copper Mesh Based on Cracked Template for Highly Durability Transparent EMI Shielding Films

Low Cost Embedded Copper Mesh Based on Cracked Template for Highly Durability Transparent EMI Shielding Films

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

Flexible Multilayered Poly(vinylidene fluoride)/Graphene-Poly(vinylidene fluoride) Films for Efficient Electromagnetic Shielding

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