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

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.

Epoxy resin nanocomposites reinforced with ionized liquid stabilized carbon nanotubes

“…Many polymers have been applied in the CNTs/polymer nanocomposites for various target applications. The introduction of the CNTs into a polymer matrix has improved the electrical conductivity as well as the mechanical properties of the polymer matrix [11][12][13][14][15][16][17][18].…”

Enhanced microwave shielding and mechanical properties of multiwall carbon nanotubes anchored carbon fiber felt reinforced epoxy multiscale composites

“…In one such study, Huang et al (2007) have reported EMI-SE of 18 dB with 15 wt% small single walled carbon nanotubes (SWCNTs) and 23-28 dB with 15 wt% long SWCNTs in the frequency band of 8-12.4 GHz. Li et al (2006) observed the SE of 49.2 dB at 10 MHz with 15 wt% long CNTs. They reported that at higher frequencies, the composites exhibited shielding effectiveness of 20 dB at 1 GHz for both 10 and 15 wt% SWCNT loadings.…”

Synergistic Conductivity and Electromagnetic Interference Shielding Effectiveness of Epoxy/Carbon Fiber and Epoxy/Carbon Black Composites via Mixing with Bamboo Charcoal

“…Researchers have used the strategy of compounding the resin as matrix with fillers such as iron powder (Hu et al 2015), nickel (Kumar et al 2014), and copper (Wetherhold and McManaman 2005). Also some shielding materials contained organic carbon nanotubes (Li et al 2006(Li et al , 2012Kotsilkova et al 2015), carbon black (Das et al 2000;Sundararaj 2008, 2013), and graphite (Liang et al 2009;Morari et al 2011;Song et al 2014). Simultaneously, Song et al (2016) have prepared an acrylonitrile styrene acrylate copolymer (ASA), blending with graphite and carbon black composites, and showed that when carbon black loading was increased to 15% and graphite loading was at 25%, the EMI shielding effectiveness reached to more than 50 dB over the frequency range of 30 to 3000 MHz.…”