Enhanced wideband microwave absorption of hollow carbon nanowires derived from a template of Al4C3@C nanowires
Enhanced wideband microwave absorption of hollow carbon nanowires derived from a template of Al4C3@C nanowires
复制标题
Al4C3@C纳米线模板衍生的空心碳纳米线的增强宽带微波吸收
DOI：
10.1016/j.carbon.2020.01.081
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发表时间：
2020-05-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Zhidong
中科院分区：
文献类型：
--
作者：
Hua, An;Li, Yong;Zhang, Zhidong
通过对Al_4C_3@C纳米线进行去合金化处理，制备了具有大量表面缺陷和比表面积的中空碳纳米线。与之前报道的石墨烯基或碳纳米管基电磁波吸收复合材料相比，中空碳纳米线由于增强的阻抗匹配和增加的电偶极子而实现增强的宽带微波吸收，这与独特的中空结构表面上的缺陷有关。结果表明，空心碳纳米线在2-18 GHz范围内的介电性能和微波吸收性能得到了显著的优化。在石蜡中填充有50wt%的中空碳纳米线的复合材料在15.7 GHz下显示出最小反射损耗（RL）为-47.1 dB，厚度为1.9 mm，在5.5 GHz下显示出最小吸收带宽（RL < -10 dB，厚度为2 mm），是最具竞争力的碳基吸收体之一。该研究为模板法制备空心碳纳米线提供了一种有效的微波性能改善途径。(C)2020爱思唯尔有限公司保留所有权利。
The hollow carbon nanowires with large number of surface defects and specific surface have been prepared by de-alloying Al4C3@C nanowires. Compared to the graphene-based or carbon-nanotube-based electromagnetic wave-absorbing composites reported previously, the hollow carbon nanowires achieve enhanced wideband microwave absorption due to enhanced impedance match and increased electric dipoles, which are related to the defects on the surface of the distinctive hollow structure. As a result, the complex dielectric and microwave absorption properties of the hollow carbon nanowires are significantly optimized in 2-18 GHz range. The composites filled with 50 wt% of hollow carbon nanowires in paraffin show a minimum reflection loss (RL) of -47.1 dB at 15.7 GHz with a thickness of 1.9 mm and 5.5 GHz (RL < -10 dB) absorbing bandwidth with thickness of 2 mm, being one of the most competitive carbon-based absorbers. This study provides an effective way to improve the microwave performance of the hollow carbon nanowires by template method. (C) 2020 Elsevier Ltd. All rights reserved.