Development of novel electromagnetic absorbers using carbon nanotube/alumina composites

采用4种不同结晶度、直径和长度的多壁碳纳米管（MWCNT），研究了无压烧结MWCNTs/Al 2 O3复合材料的电磁吸收性能，探讨了结晶度、直径和长度对复合材料电磁吸收性能的影响。已经发现，含有在2873 K下退火的具有较高结晶度的MWCNT的复合材料与其他类型的MWCNT以及单独的氧化铝相比显示出更高的电磁吸收性能。它也已被证明，在多壁碳纳米管的直径和长度的差异导致对复合材料的电磁吸收性能没有显着的影响。

Electromagnetic absorption properties of pressureless-sintered multi-walled carbon nanotube (MWCNT)/alumina composites have been investigated using four types of MWCNTs having different crystallinity as well as diameter and length; the influence of crystallinity, diameter and length on the composites' electromagnetic absorption properties have been explored. It has been found that the composites containing the MWCNT annealed at 2873 K with higher degree of crystallinity showed higher electromagnetic absorption properties compared to other types of MWCNTs as well as alumina alone. It has been also shown that differences in the diameter and length of the MWCNTs lead to no significant impact on the electromagnetic absorption properties of the composites.