Electromagnetic characteristics and wave absorption performance prediction of nanofiber composite films doped by conductive particles
Conductive particles such as zinc oxide,graphene and copper powder were selected as electromagnetic media,and polylactic acid nanofiber composite films doped by conductive particles were prepared by"electrospinning+spray method".The structure and electromagnetic characteristics of the composite films were characterized,and the effects of conductive particle types and contents,and the film thickness on electromagnetic parameters of the composite films were studied,so as to predict their wave absorption performances.The results show that the electromagnetic parameter characteristics of the films doped with conductive particles are related to the contents of conductive particles.As the mass fraction of conductive particle increases,the dielectric constant real part and imaginary part of the film show a clear increasing trend.The graphene doped film has large dielectric parame-ters,and the dielectric loss is much larger than the magnetic loss.The graphene doped film with 25 wt%graphene has a reflection loss of-27.51 dB at the film thickness of 10.0 mm.With the increase of the thickness of the doped film,the peak value of reflection loss gradually moves from high frequency to low frequency at the same mass fraction,and the film tends to choose the electromag-netic wave with longer absorption wavelength and lower frequency.With the increase of conductive particle content,reflection loss value decreases gradually,more conductive particles can form a more complete conductive network,polarization ability and dielec-tric loss are enhanced,and electromagnetic loss is increased.Reflection loss value and absorption bandwidth are related to the content of conductive particle and film thickness,and the electromagnetic absorption performance of the film material can be regulat-ed by adjusting the content of conductive particles and the thickness of the doped film.
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