Off/on switchable smart electromagnetic interference shielding aerogel

被引：204

作者：

Liu, Xiaofang ^{[1
]}

Li, Ya ^{[1
,4
]}

Sun, Xin ^{[1
,3
]}

Tang, Wukui ^{[1
]}

Deng, Gao ^{[1
]}

Liu, Yajie ^{[1
]}

Song, Zhiming ^{[1
]}

Yu, Yuanhang ^{[1
]}

Yu, Ronghai ^{[1
]}

Dai, Liming ^{[2
]}

Shui, Jianglan ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Univ New South Wales, Sch Chem Engn, Sydney, NSW 2052, Australia

[3] Sci & Technol Electromagnet Scattering Lab, Beijing 100854, Peoples R China

[4] China Mobile Res Inst, Beijing 100053, Peoples R China

来源：

MATTER | 2021年 / 4卷 / 05期

基金：

中国国家自然科学基金;

关键词：

LIGHTWEIGHT; COMPOSITE; ABSORPTION; FRAMEWORK; FILMS;

D O I：

10.1016/j.matt.2021.02.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Smart electromagnetic interference (EMI) shielding materials with tunable EM wave response characteristics are attractive for future EM devices. Here, we report an off/on switchable EMI shielding material that can be tuned from EM wave transmission to shielding and vice versa by mechanical compression and decompression. This smart material is prepared by filling conductive carbon nanoparticles into wood-derived lamellar carbon aerogel, showing reversible compressibility and strain-sensitive conductivity. The original aerogel has good impedance matching and low dielectric loss, allowing the EM wave to pass through. Mechanical compression enables the carbon nanoparticles to establish highly conductive pathways in the aerogel, which significantly increases the conductivity of aerogel and thus activates its EMI shielding performance. This function switch is reversible by repeatedly compressing and decompressing the aerogel. The availability of such a never-before -realized off/on switchable EMI shielding material provides an opportunity for the development of advanced smart EM devices.

引用

页码：1735 / 1747

页数：13

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