Carbon-nanotube-based ultralight materials for ultrabroadband electromagnetic wave shielding and absorption

Abstract

In this paper, we report ultralight carbon-nanotube (CNT)-infused materials with high electromagnetic shielding and absorption performance over an ultrabroadband frequency range. By controlling the CNT content and thickness of ultralight aerogels composed of CNTs during fabrication, their electromagnetic shielding/absorbing performance can be tuned over a wide frequency range (5.6–110 GHz). Samples with 40 wt% CNTs exhibit excellent shielding performance in an intensity range of 30–90 dB in all frequency ranges. Samples with less than 5 wt% CNTs show improved electromagnetic wave absorption performance of more than 10 dB. In addition, in samples with 2 and 4 wt% CNTs, strong absorption of over 25 dB occurs at certain frequencies. These CNT aerogels, which are ultralight (bulk density: 10 mg cm−3) and exhibit good mechanical properties, are expected to become a new material for electromagnetic shielding and absorption in advanced engineering applications.

Strategies for the effective design and regulation of carbon-based metacomposites: a review

“…Conductive polymers such as polyaniline 39 and polypyrrole 40 are also widely used in constructing polymerbased metacomposites. Due to their diversity, high conductivity, wide application in supercapacitors, 41,42 energy storage materials 43,44 and other functional materials, [45][46][47][48] carbon materials exhibit great potential for building novel functionalized metacomposites. Efficient plasma oscillation can be achieved by constructing a carbon conductive network within the material.…”

Ultralight Single‐Walled Carbon Nanotube Aerogels for Low‐Frequency Sound Absorption

“…The hierarchical porous framework fabricated by a freeze-drying process using the growth of ice in the dispersion as a template produces ultralight and robust aerogels because it consists of strong SWCNT-CMC composite nanofiber networks. [32,33] The diameter of SWCNT-CMC composite nanofibers is smaller by more than an order of magnitude than that of microfibers fabricated by electrospinning, providing more opportunities for acoustic energy loss within the material. Furthermore, by confirming the consistency with the Biot-Johnson-Champoux-Allard (Biot-JCA) model, [34] which simultaneously considers the air-borne and solid-borne sound in the material, we showed that both the porous structure and elastic modulus of the framework of the ultralight SWCNT aerogel contribute to sound absorption.…”