(305a) Electromagnetic Wave Absorbing Polymer Nanocomposites

Multifunctional polymer matrix nanocomposites filled with nanofillers including iron nanoparticles, carbon nanotubes, graphene nanoplatelets, and the carbon nanotubes coated with magnetic iron oxide nanoparticles were prepared for microwave absorption at gigahertz frequency range. Surface treatment/functionalization with surfactant was used to improve the nanoparticle dispersion quality and then to enhance the microwave absorption performance. Relative complex permittivity and relative complex permeability are investigated and the corresponding microwave absorption efficiency were calculated within the tested frequency ranging from 2 - 20 GHz. Results indicate that silica coated iron core-shell nanoparticles were found to be able to reduce the eddy current effect of untreated iron nanoparticles in the polymer matrix. Meanwhile, carbon nanotubes coated with iron oxide nanoparticles could improve the matching between magnetic and dielectric loss for enhanced microwave absorption. Other fillers like graphene nanoplatelets with high microwave absorption efficiency were also studied and discussed in details.

References:

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