Electromagnetic Interference (EMI) Shielding of Single-Walled Carbon Nanotube Epoxy Composites

Ning Li(Nankai University), Yi Huang(Nankai University), Feng Du(Pennsylvania State University), Xiaobo He(Nankai University), Xiao Lin(Chinese Academy of Sciences), Hongjun Gao(Pennsylvania State University), Yanfeng Ma(Institute of Physics), Feifei Li(Institute of Physics), Yongsheng Chen(Chinese Academy of Sciences), P. C. Eklund(Nankai University)
Nano Letters
May 5, 2006
10.1021/nl0602589
Cited by 1,200

Abstract

Single-walled carbon nanotube (SWNT)-polymer composites have been fabricated to evaluate the electromagnetic interference (EMI) shielding effectiveness (SE) of SWNTs. Our results indicate that SWNTs can be used as effective lightweight EMI shielding materials. Composites with greater than 20 dB shielding efficiency were obtained easily. EMI SE was tested in the frequency range of 10 MHz to 1.5 GHz, and the highest EMI shielding efficiency (SE) was obtained for 15 wt % SWNT, reaching 49 dB at 10 MHz and exhibiting 15-20 dB in the 500 MHz to 1.5 GHz range. The EMI SE was found to correlate with the dc conductivity, and this frequency range is found to be dominated by reflection. The effects of SWNT wall defects and aspect ratio on the EMI SE were also studied.

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