Xu Jiaming, Xia Long, Luo Juhua, Lu Siru, Huang Xiaoxiao, Zhong Bo, Zhang Tao, Wen Guangwu, Wu Xin, Xiong Li, Wang Gang
School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China.
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China.
ACS Appl Mater Interfaces. 2020 May 6;12(18):20775-20784. doi: 10.1021/acsami.9b19281. Epub 2020 Apr 21.
High-performance electromagnetic (EM) wave absorbing materials are strongly desired in many fields like portable devices and aircraft. Introducing carbon nanotubes (CNTs) to certain materials has been proved to be an effective method leading to good EM wave absorption capability. In this work, CNTs are successfully synthesized on SiC fibers with high speed by using a newly developed method which is far more efficient than the commonly used one. The obtained CNT/SiC composites exhibit high-performance EM wave absorption capability. With 0.72 wt % CNTs, the reflection loss of the 4 mm composite with only 20 wt % filler loading reaches -62.5 dB with the broad effective absorption bandwidth of 8.8 GHz, covering almost the entire Ku band and three-quarters X band. Moreover, the composites can be added to varying matrices so as to modify their EM wave absorption and other properties. The EM wave absorption performance can be easily tuned in a wide range by varying the CNT content, thickness, and filler loading. This work offers a new route for efficiently synthesizing CNTs but, more importantly, for designing high-performance and multifunctional EM wave absorbing materials.
在便携式设备和飞机等许多领域，对高性能电磁波（EM）吸收材料有着强烈的需求。已证明将碳纳米管（CNT）引入某些材料是一种获得良好电磁波吸收能力的有效方法。在这项工作中，通过使用一种新开发的方法，在碳化硅（SiC）纤维上成功地高速合成了碳纳米管，该方法比常用方法效率高得多。所获得的碳纳米管/碳化硅复合材料表现出高性能的电磁波吸收能力。含有0.72 wt%碳纳米管的4毫米复合材料，仅填充20 wt%的填料时，反射损耗达到-62.5 dB，有效吸收带宽宽达8.8 GHz，几乎覆盖了整个Ku波段和四分之三的X波段。此外，这些复合材料可以添加到不同的基体中，以改变它们的电磁波吸收性能和其他性能。通过改变碳纳米管的含量、厚度和填料负载量，可以很容易地在很宽的范围内调节电磁波吸收性能。这项工作为高效合成碳纳米管提供了一条新途径，但更重要的是，为设计高性能和多功能的电磁波吸收材料提供了新途径。
