Enhanced electromagnetic wave shielding effectiveness of Fe doped carbon nanotubes/epoxy composites

Abstract

Fe doped multi-walled carbon nanotubes (MWCNTs)/epoxy composites were fabricated for the investigation of electromagnetic interference (EMI) shielding. Compared with the pristine MWCNTs, a small amount of Fe doping into the MWCNTs can substantially improve the EMI shielding effectiveness (SE) of MWCNTs/epoxy composites. The highest EMI shielding effectiveness of the composites is −32 to −41 dB in the measured frequency range from 26 to 40 GHz for the sample with 8 wt. % Fe doped MWCNT loading. The contribution of EMI SE of the composites is mainly due to dielectric loss rather than magnetic loss.