碳纳米纤维和多壁碳纳米管填充聚合物复合材料电磁干扰屏蔽性能的比较研究。

A comparative study of EMI shielding properties of carbon nanofiber and multi-walled carbon nanotube filled polymer composites.

作者信息

Yang Yonglai, Gupta Mool C, Dudley Kenneth L, Lawrence Roland W

机构信息

Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, Virginia 22904, USA.

出版信息

J Nanosci Nanotechnol. 2005 Jun;5(6):927-31. doi: 10.1166/jnn.2005.115.

DOI:10.1166/jnn.2005.115

PMID:16060155

Abstract

Electromagnetic interference shielding properties of carbon nanofiber- and multi-walled carbon nanotube-filled polystyrene composites were investigated in the frequency range of 8.2-12.4 GHz (X-band). It was observed that the shielding effectiveness of composites was frequency independent, and increased with the increase of carbon nanofiber or nanotube loading. At the same filler loading, multi-walled carbon nanotube-filled polystyrene composites exhibited higher shielding effectiveness compared to those filled with carbon nanofibers. In particular, carbon nanotubes were more effective than nanofibers in providing high EMI shielding at low filler loadings. The experimental data showed that the shielding effectiveness of the composite containing 7 wt% carbon nanotubes could reach more than 26 dB, implying that such a composite can be used as a potential electromagnetic interference shielding material. The dominant shielding mechanism of carbon nanotube-filled polystyrene composites was also discussed.

摘要

研究了碳纳米纤维和多壁碳纳米管填充的聚苯乙烯复合材料在8.2 - 12.4 GHz（X波段）频率范围内的电磁干扰屏蔽性能。观察到复合材料的屏蔽效能与频率无关，且随碳纳米纤维或纳米管负载量的增加而提高。在相同的填料负载量下，多壁碳纳米管填充的聚苯乙烯复合材料比碳纳米纤维填充的复合材料表现出更高的屏蔽效能。特别是，在低填料负载量下，碳纳米管在提供高电磁干扰屏蔽方面比纳米纤维更有效。实验数据表明，含有7 wt%碳纳米管的复合材料的屏蔽效能可达26 dB以上，这意味着这种复合材料可作为潜在的电磁干扰屏蔽材料。还讨论了碳纳米管填充的聚苯乙烯复合材料的主要屏蔽机制。