Recent advances in graphene-based films for electromagnetic interference shielding: Review and future prospects

Chen, Yao; Li, Jinzhe; Li, Tian; Zhang, Likui; Meng, Fanbin

doi:10.1016/j.carbon.2021.04.091

Cited by 188 publications

(67 citation statements)

References 154 publications

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“…Interaction and interference of the microwaves cause devices to malfunction and have an impact on the human central nervous system. Therefore, seeking and developing shielding materials that show high effectiveness has become increasingly examined in the last decades, and the research is fully justified [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

et al. 2021

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Polymer composites containing carbon nanofillers are extensively developed for electromagnetic shielding applications, where lightweight and flexible materials are required. One example of the microwave absorbers can be thermoplastic fibers fabricated from copolyamide hot melt adhesives and 7 wt % of multi-walled carbon nanotubes, as presented in this paper. A broadband dielectric spectroscopy confirmed that the addition of carbon nanotubes significantly increased microwave electrical properties of the thin (diameter about 100 μm) thermoplastic fibers. Moreover, the dielectric properties are improved for the thicker fibers, and they are almost stable at the frequency range 26–40 GHz and not dependent on the temperature. The variances in the dielectric properties of the fibers are associated with the degree of orientation of carbon nanotubes and the presence of bundles, which were examined using a high-resolution scanning microscope. Analyzing the mechanical properties of the nanocomposite fibers, as an effect of the carbon nanotubes addition, an improvement in the stiffness of the fibers was observed, together with a decrease in the fibers’ elongation and tensile strength.

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Section: Introductionmentioning

confidence: 99%

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

et al. 2021

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“…When electromagnetic waves incident into the materials, according to the equation (1), the electromagnetic waves will be influenced by four different shielding mechanisms, including the reflection (R), absorption (A), multiple reflection (M), and circular reflection (C). The transmission line analogy was adopted to explain electromagnetic shielding of plane waves by Schelkunoff [25,26]. According to Schelkunoff theory, reflection (SE R ), absorption (SE A ) and multiple reflections (SE M ) constitute to the EMI SE T , which is the total shielding effectiveness.…”

Section: Electromagnetic Shielding Propertiesmentioning

confidence: 99%

Microstructures and electromagnetic interference shielding effectiveness of ME21/Mg laminated materials by accumulative roll bonding

Zhang

Zhao

et al. 2021

Mater. Res. Express

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Laminated composite with multi-layer interfaces has better electromagnetic interference shielding performance, which has attracted great attention. In this work, magnesium matrix laminated structure materials were prepared through Accumulative Roll Bonding (ARB). Microstructure, electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of ME21/Mg laminated materials were investigated to understand the effect of layered structure and the change of microstructure on the electromagnetic shielding property. The results showed: the precipitated secondary phase and introduced interfaces could provide multiple reflections, attenuate the electromagnetic waves and improve the SE value. The electrical conductivity of 2-cycle increased to 21.04*106S/m，which was 17.74% higher than that of ME21 alloy, the intensity of texture of ME21 layer increased with the rolling passes, which contributed to the improvement of the electrical conductivity as well as the attenuation of reflection. The layered composite exhibited better shielding effectiveness compared with the ME21, in the 8.2-12.4 GHz test frequency, the SE was 98-107dB. The shielding mechanism of layered materials was explained, which provided guiding for the efficient shielding of electromagnetic waves.

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“…For this reason, polymer-based foam materials can replace metal-based materials with high densities, easy corrosion, and difficult processing properties. [3][4][5][6] Normally, materials with excellent EMI shielding performance need to have a high electrical conductivity. Thereby, graphene is added into polymer matrix as conductive filler to form effective a conductive network for the purpose of increasing conductivity.…”

Section: Introductionmentioning

confidence: 99%

Preparation of polysiloxane foam with graphene for promoting electromagnetic interference shielding performance and thermal stability

Sima

Sui

Zhang

2022

J of Applied Polymer Sci

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Mechanical exfoliation of graphene (MEG) and reduced graphene oxide (RGO) are fabricated with using graphite and they are used as fillers to improve the electromagnetic interference (EMI) shielding performance and thermal stability of polysiloxane composite foam. Since graphene builds a conductive network in the matrix and at the same time enhances the impedance mismatch between the syntactic foam and the external free space, the total shielding effectiveness (SE total ) of the composite foam can reach up to 4.74 dB, which is 500% higher than that of pure foam. Moreover, the layered structure of graphene can restrict the small molecules generated during the foam pyrolysis process from leaving the system, and also increases the maximum decomposition temperature of the composite foam (increased from 431.8 to about 500 C), which improves the thermal stability of the foam. These results indicate that the combination of graphene in polysiloxane foams produces composite foams with multifunctional properties, suitable for applications requiring EMI shielding and thermal performance.

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Recent advances in graphene-based films for electromagnetic interference shielding: Review and future prospects

Cited by 188 publications

References 154 publications

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

Microstructures and electromagnetic interference shielding effectiveness of ME21/Mg laminated materials by accumulative roll bonding

Preparation of polysiloxane foam with graphene for promoting electromagnetic interference shielding performance and thermal stability

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