Natural Hollow Fiber-Derived Carbon Microtube with Broadband Microwave Attenuation Capacity
文献类型： 外文期刊
作者： Zhao, Yanfang 1 ; Long, Aichun 1 ; Zhao, Pengfei 2 ; Liao, Lusheng 3 ; Wang, Rui 2 ; Li, Gaorong 2 ; Wang, Bingbing 1 ; Liao, Xiaoxue 1 ; Yu, Rentong 1 ; Liao, Jianhe 1 ;
作者机构： 1.Hainan Univ, Sch Mat Sci & Engn, Key Lab Adv Mat Trop Isl Resources, Minist Educ, Haikou 570228, Hainan, Peoples R China
2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Guangdong Prov Key Lab Nat Rubber Proc, Zhanjiang 524001, Peoples R China
3.Hainan Prov Key Lab Nat Rubber Proc, Zhanjiang 524001, Peoples R China
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
页码：
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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