Zhang Mu, Song Sinan, Liu Yamin, Hou Zaoxia, Tang Wenyi, Li Shengnan
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
Foshan Graduate School, Northeastern University, Foshan 528311, China.
Materials (Basel). 2021 Aug 24;14(17):4783. doi: 10.3390/ma14174783.
In order to manufacture microwave absorbers with strong attenuation abilities and that are light weight, in this paper, ferromagnetic carbon matrix composites were prepared by the composite of carbon nanotubes with adjustable dielectric constant and FeO. FeO/MWCNT composites with well-designed necklace-like structure and controllable size in the range of 100-400 nm have been successfully achieved by a simple solvent thermal method. A series of samples were prepared by changing experimental parameters. The microwave absorption characteristics of these samples were studied from the dielectric constant and magnetic permeability in two aspects. The electromagnetic absorption properties of the composites show obvious differences with different microsphere sizes, different microsphere density and different proportion of additives. When the solvothermal time is 15 h and the microsphere size is 400 nm, the reflection loss reaches -38 dB. The interfacial polarization caused by the unique structural design and good impedance matching produce composites that possess excellent electromagnetic loss ability.
为了制备具有强衰减能力且重量轻的微波吸收剂，本文通过将具有可调介电常数的碳纳米管与FeO复合来制备铁磁碳基复合材料。通过简单的溶剂热法成功制备出具有精心设计的项链状结构且尺寸可控在100 - 400 nm范围内的FeO/MWCNT复合材料。通过改变实验参数制备了一系列样品。从介电常数和磁导率两个方面研究了这些样品的微波吸收特性。复合材料的电磁吸收性能随微球尺寸、微球密度和添加剂比例的不同而表现出明显差异。当溶剂热时间为15 h且微球尺寸为400 nm时，反射损耗达到 -38 dB。独特的结构设计和良好的阻抗匹配所引起的界面极化产生了具有优异电磁损耗能力的复合材料。
