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Sustainable Kapok Fiber-Derived Carbon Microtube as Broadband Microwave Absorbing Material

文献类型： 外文期刊

作者： Long, Aichun 1 ; Zhao, Pengfei 2 ; Liao, Lusheng 2 ; Wang, Rui 2 ; Tao, Jinlong 2 ; Liao, Jianhe 1 ; Liao, Xiaoxue 1 ; Zhao, Yanfang 1 ;

作者机构： 1.Hainan Univ, Sch Mat Sci & Engn, Haikou 570228, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Key Lab Trop Crop Prod Proc, Minist Agr & Rural Affairs, Zhanjiang 524001, Peoples R China

3.Hainan Prov Key Lab Nat Rubber Proc, Zhanjiang 524001, Peoples R China

关键词： biomass-derived carbon; kapok fiber; electromagnetic loss; microwave-absorbing performance

期刊名称：MATERIALS （ 影响因子：3.748； 五年影响因子：4.042 ）

ISSN：

年卷期： 2022 年 15 卷 14 期

页码：

收录情况： SCI

摘要： The design of hierarchical structures from biomass has become one of the hottest subjects in the field of microwave absorption due to its low cost, vast availability and sustainability. A kapok-fiber-derived carbon microtube was prepared by facile carbonization, and the relation between the structure and properties of the carbonized kapok fiber (CKF) was systematically investigated. The hollow tubular structures afford the resulting CKF composites with excellent microwave-absorbing performance. The sample with a 30 wt.% loading of CKF in paraffin demonstrates the strongest microwave attenuation capacity, with a minimum reflection loss of -49.46 dB at 16.48 GHz and 2.3 mm, and an optimized effective absorption bandwidth of 7.12 GHz (10.64-17.76 GHz, 2.3 mm) that covers 34% of the X-band and 96% of the Ku-band. Further, more than 90% of the incident electromagnetic wave in the frequency from 4.48 GHz to 18.00 GHz can be attenuated via tuning the thickness of the CKF-based absorber. This study outlines a foundation for the development of lightweight and sustainable microwave absorbers with a high absorption capacity and broad effective absorption bandwidth.

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