Natural Hollow Fiber-Derived Carbon Microtube with Broadband Microwave Attenuation Capacity

文献类型： 外文期刊

第一作者： Zhao, Yanfang

作者： Zhao, Yanfang;Long, Aichun;Wang, Bingbing;Liao, Xiaoxue;Yu, Rentong;Liao, Jianhe;Zhao, Pengfei;Wang, Rui;Li, Gaorong;Wang, Bingbing;Liao, Lusheng

作者机构：

关键词： biomass-derived carbon microtube; kapok fiber; electromagnetic loss; microwave attenuation

期刊名称：POLYMERS （ 影响因子：4.967； 五年影响因子：5.063 ）

ISSN：

年卷期： 2022 年 14 卷 21 期

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收录情况： SCI

摘要： Constructing hierarchical structures is indispensable to tuning the electromagnetic properties of carbon-based materials. Here, carbon microtubes with nanometer wall thickness and micrometer diameter were fabricated by a feasible approach with economical and sustainable kapok fiber. The carbonized kapok fiber (CKF) exhibits microscale pores from the inherent porous templates as well as pyrolysis-induced nanopores inside the wall, affording the hierarchical carbon microtube with excellent microwave absorbing performance over broad frequency. Particularly, CKF-650 exhibits an optimized reflection loss (RL) of -62.46 dB (10.32 GHz, 2.2 mm), while CKF-600 demonstrates an effective absorption bandwidth (RL < -10 dB) of 6.80 GHz (11.20-18.00 GHz, 2.8 mm). Moreover, more than 90% of the incident electromagnetic wave ranging from 2.88 GHz to 18.00 GHz can be dissipated by simply controlling the carbonization temperature of KF and/or the thickness of the carbon-microtube-based absorber. These encouraging findings provide a facile alternative route to fabricate microwave absorbers with broadband attenuation capacity by utilizing sustainable biomass.

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