Absorption-dominated electromagnetic shielding and excellent thermal conduction properties of poly(vinylidene fluoride)/SnBi58/Co-C composites with layered structure

Wang, Hui; Bi, Huiqin; Liang, Dandan; Gui, Xu; Ding, Xin; Zhang, Xian; Gao, Jiangang; Zi, Zhenfa

doi:10.1016/j.jallcom.2022.165998

Cited by 7 publications

(1 citation statement)

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“…Typically, polymer-based electromagnetic shielding composites with a layered structure exhibit sandwich and gradient configurations, which can be easily prepared using methods like vacuum filtration and deposition [162][163][164]. Due to their strong absorbing ability, these layered materials find extensive applications in critical fields such as military technology and precision instruments, significantly reducing secondary pollution caused by electromagnetic wave reflection [165][166][167][168]. Yu et al [169] prepared PI(polyimide)/Ti 3 C 2 Tx Mxene/AgNW(silver nanowire) composite through electrostatic spinning and a hot-press approach.…”

Section: Layered Structurementioning

confidence: 99%

Review of Polymer-Based Composites for Electromagnetic Shielding Application

et al. 2023

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The rapid advancement of electronic communication technology has greatly aided human productivity and quality of life, but it has also resulted in significant electromagnetic pollution issues. Traditional metals and alloys are often used for electromagnetic interference (EMI) shielding due to their excellent electrical conductivity. However, they have drawbacks such as being heavy, expensive, and having low corrosion resistance, which limits their application in electromagnetic shielding. Therefore, it is crucial to develop novel EMI shielding materials. Polymers, being highly flexible, corrosion-resistant, and possessing high specific strength, are frequently employed in electromagnetic shielding materials. In this review, we firstly introduce the basic theory of electromagnetic shielding. Then, we outline the processing methods and recent developments of polymer-based electromagnetic shielding composites, including uniform-, foam-, layered-, and segregated structures. Lastly, we present the challenges and prospects for the field, aiming to provide direction and inspiration for the study of polymer-based electromagnetic shielding composite materials.

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Section: Layered Structurementioning

confidence: 99%

Review of Polymer-Based Composites for Electromagnetic Shielding Application

et al. 2023

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Zeolitic Imidazolate Frameworks Derived Magnetic Nanocage/MXene/Nanocellulose Bilayer Aerogels for Low Reflection Electromagnetic Interference Shielding and Light‐to‐Heat Conversion

Mai,

Chen,

Liu

et al. 2024

Adv Funct Materials

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To cope with the increasingly serious electromagnetic pollution, the demand for electromagnetic interference (EMI) shielding materials with low electromagnetic wave reflection ability has become urgent. Controlling electrical components, magnetic components, and designing the EMI material structure can effectively improve electromagnetic shielding performance, but this remains a significant challenge. Besides, extreme cold weather conditions also do considerable potential damage to the normal work of outdoor electronic equipment. Integrated light‐to‐heat conversion capability on electromagnetic shielding materials can further improve the stability and reliability of the equipment. Herein, the novel bilayer aerogels composed of zeolitic imidazolate frameworks derived hollow CoNi carbon nanocage/MXene Ti3C2Tx/nanocellulose (BZMN) are prepared by a two‐step freezing method. BZMN aerogels exhibit good EMI shielding effectiveness (SE) with low reflection coefficient (R coefficients): 35.1 dB (R coefficient = 0.28) and 21.2 dB (R coefficient = 0.25). The unique structures of bilayer aerogels demonstrate the ability to absorb more electromagnetic waves through interfacial polarization and multiple scattering. The green shielding index (gs) of BZMN aerogels can reach 2.88. Moreover, BZMN aerogels show remarkable and unique light‐to‐heat conversion performance on different surfaces. Under 2.0 sun intensity, temperatures can reach 109.3 °C in the upper layer and 102.3 °C in the lower layer. Under 0.8 W cm−2 near‐infrared (NIR) laser intensity, the temperatures can rise to 234.1 °C in the upper layer and 167.4 °C in the lower layer. In addition, the size and shape of BZMN aerogels can be customized according to the mold. These features present BZMN aerogels as advanced potential low reflection EMI shielding device candidates, useful for future telecommunication and electronic equipment protection.

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