An innovative ternary composite paper of graphene and Fe3O4 decorated multi-walled carbon nanotube for ultra-efficient electromagnetic interference shielding and fire-resistant properties

Herein, Fe3O4 modified multi-walled carbon nanotube (Fe3O4@MWCNTs) hetemstructure has been synthesized by a one-pot simplified coprecipitation method. After introducing it into graphene oxide dispersions, Fe3O4@MWCNTs/reduced graphene oxide (RGO) composite paper was prepared by evaporation-assisted self-assembly and hydrazine hydrate vapor reduction. The composite paper's electrical conductivity, electromagnetic interference (EMI) shielding and fire-resistant properties were investigated by four-point probe method, network analysis and combustion test method, respectively. The EMI shielding effectiveness (SE) can be adjusted by the filling amount of Fe3O4@MWCNTs and paper's thickness. When the thickness of the composite paper is approximately 0.6 mm and the mass fraction of Fe3O4@MWCNTs is 2%, the total SE of the composite paper in the X-band reaches 45.9 dB, which is 31.14% higher than that of the pure RGO paper (similar to 35 dB). Therefore, the Fe3O4@MWCNTs/RGO composite paper prepared in this study is a promising lightweight shielding material, especially suitable for various harsh natural high temperature environments.

Automated summary

In this study, Fe3O4@MWCNTs/RGO composite paper was successfully synthesized and its electrical conductivity, EMI shielding, and fire-resistant properties were investigated. The EMI shielding effectiveness of the composite paper can be adjusted by the filling amount and thickness, with the best performance achieved at 2% filling amount and 0.6 mm thickness.