Electromagnetic Property of α-Fe Filled Carbon Nanotubes

Carbon nanotubes filled withα-Fe nanowires (FCNT) was prepared conveniently by the pyrolysis of ferrocene.The lengths of iron nanowires were in the range of 30-500nm.Carbon nanotubes can protect inner iron nanowires from oxidation.After filling FCNT into paraffin wax to form a composite,both the permittivity and permeability in 2-18GHz of as-prepared composite samples were measured.Compared with pure carbon nanotubes (MCNT),the real part,imaginary part of permittivity and the real part of permeability are improved remarkably.However,the imaginary part of permeability is lower than that of MCNT.There are two peaks of reflection loss for FCNT/epoxy coating at 3.5GHz and 5.0GHz,whose reflection loss values are -3.9dB and -4.0dB,respectively.The results show that this novel absorber is promising to absorb microwave in 2-4GHz frequency effectively.