Large-scale synthesis, electromagnetic and enhanced microwave absorption properties of low helicity carbon nanotubes/Fe nanoparticles hybrid

Abstract

Large-scale of low helicity carbon nanotubes filled with Fe nanoparticles have been synthesized by pyrolysis of acetylene at 600°C over Fe2O3 nanotubes derived from the hydrothermal method. The electromagnetic parameters and microwave absorbing properties were investigated in the 0.5–18GHz frequency range. A maximum reflection loss (RL) value of the obtained sample is ca. 39.40dB at 11.14GHz. The RL value below −10dB (90% absorption) can be obtained almost in the whole frequency range, and enhanced absorption of electromagnetic wave (reflection loss<−20dB) was observed in the 7.66–11.14GHz range (1.2–3.0mm thickness). The results indicate that the obtained sample exhibits excellent microwave-absorbing ability and is a potential light-weight microwave absorber.