Electromagnetic interference shielding effectiveness of nano and carbon compounds : an analysis of yttrium-iron garnet, bacterial cellulose, nitrogen-doped reduced graphene oxide and iron and cobalt nanowires

Abstract

This work aims to present a possible solution to the growing problem of electromagnetic pollution through the shielding effect against electromagnetic interference, analyzed in five compounds. The methodology consists of creating a theoretical introduction to electromagnetic waves, establishing a theoretical framework for a better understanding of the electromagnetic pollution problem and the shielding effect against electromagnetic interference. It involves understanding and citing the devices causing this pollution, preparing samples of yttrium-iron garnet on alumina membrane using the sol-gel method, bacterial cellulose samples cultivated in HS medium, reduced graphene oxide samples doped with nitrogen using the Hummers method, and iron and cobalt nanowires samples with a thin layer of gold, grown on alumina membrane using the electrodeposition method to serve as potential solutions to the problem. Finally, a Vector Network Analyzer is used to measure the shielding obtained from these samples on the microwave band X. It was then observed an insignificant residual shielding for yttrium-iron garnet, low shielding in the range of 5.7 dB for bacterial cellulose, and moderate shielding for the other composites, with nitrogen doped graphene oxide with Fe3O4 having 27.3 dB of shielding, cobalt nanowires with 17.9 dB, and iron nanowires with 34.0 dB of shielding.