文献类型：期刊文献

英文题名：Broadband microwave absorption of multilayered materials based on ultrathin carbon nanotube strips

作者：Li, Chao Qun[1];Wang, Jian Nong[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：234

外文期刊名：CARBON

收录：;EI(收录号：20250217663064);WOS:【SCI-EXPANDED(收录号:WOS:001399823600001)】；

基金：This research was supported by National Key R & D Program of China (2022YFA1203303) , National Natural Science Foundation of China (52172089) , and Innovation Program of Shanghai Municipal Education Commission.

语种：英文

外文关键词：Ultrathin CNT strips; Multilayered structure; Microwave absorption; Impedance matching; Broadband absorption

摘要：Achieving effective microwave absorption (reflection loss < -10 dB) over wide frequencies at a thin thickness and a low usage of absorbents is still a big challenge due to the intrinsic contradiction between the impedance match and attenuation capability of microwave absorption (MA) materials. In this study, a general strategy is proposed to enhance the impedance match and the attenuation capability at the same time through using a thin material with a strong dielectric loss and introducing a substrate or interlayer with a low dielectric loss. For this purpose, ultrathin carbon nanotube (CNT) strips and thin glass fiber (GF) sheets are taken as examples. That is, a monolayer of ultrathin CNT strips is deposited on the GF sheet as a MA sheet, and then the sheets are stacked in parallel as multilayers with or without bare GF interlayers. As a result, electromagnetic parameters can be modulated, and effective absorption over wide bands of 3-18 GHz is achieved at a thickness of only 7 mm with the use of an extremely low amount of the CNT absorbent. Furthermore, the effective absorption covers the full radar frequency range of 1-18 GHz for the first time through a stacking design with a gradient structure for impedance matching and large attenuation. This study presents a novel and straightforward approach for the fabrication of layered materials with a minimal thickness, a low filling ratio, and robust absorption capabilities with a broadband microwave absorption for wide applications.