Investigation of EMI-shielding properties of buckypaper manufactured with an easily scalable method.

This paper proposes a simple and easily scalable method for the production of buckypapers. Buckypapers are made by airbrushing a suspension of dispersed SWCNTs onto a PET substrate, followed by solvent evaporation. The process does not require sophisticated equipment and is technologically straightforward. The study investigates the properties of buckypaper made of SWCNTs, both purified and unpurified from metallic impurities, and CVD graphene for EMI shielding in the S-band of microwaves (2-4 GHz). Plates of these materials were installed in a waveguide cross section. The results show that these buckypapers exhibit high overall shielding effectiveness. It is found that buckypapers based on purified carbon nanotubes have higher shielding parameters than those based on unpurified CNTs. This is due to the higher electrical conductivity of purified CNT composites without metallic inclusions. The proposed method for the production of buckypaper allows the efficient production of shielding materials on a large scale. Graphene plates synthesised by chemical vapour deposition (CVD) have unique properties. The graphene plates have a reflection coefficient of about -15 dB and a transmission coefficient of about -3 dB. This indicates that the thin plates have low reflection and significant absorption of incident microwave power. .