Graphene/Magnetite (Fe3O4) Hybrid Fillers for Thermoplastic Composites: X-Band Electromagnetic Interference Shielding Characteristics

Abstract

Hybrid composites of poly(methyl methacrylate) (PMMA) and polyvinyl chloride (PVC) with multilayered graphene/iron oxide (MLG/Fe 3 O 4 ) were prepared by solution casting. Tensile and viscoelastic characteristics of the hybrid nanocomposites were studied in comparison with the corresponding pure polymer and polymer/MLG composite. Increase in Fe 3 O 4 content in the hybrid composites reduces their electrical conductivity and thermal stability. The hybrid composite films were hot stacked to get a 2-mm-thick multilayered sandwich structure and tested for their X-band microwave absorption characteristics. The decrease in electrical conductivity resulted in lower overall shielding effectiveness of the hybrid composites. Hybrid composites with 2.5 wt.% Fe 3 O 4 exhibited satisfactory electromagnetic interference (EMI) shielding effectiveness at par with the polymer/MLG composites. The hybrid nanocomposites had a significantly higher influence of absorption in the overall shielding effectiveness when compared to the respective polymer/MLG composites. Both PMMA-based and PVC-based graphene/Fe 3 O 4 hybrid nanocomposites with proper filler contents are found suitable for EMI shielding solutions with higher absorption requirements.

Optimization of CoFe2O4 nanoparticles and graphite fillers to endow thermoplastic polyurethane nanocomposites with superior electromagnetic interference shielding performance

“…Therefore, the value of conductivity was reduced at higher fraction loading of CoFe 2 O 4 nanoparticles. 73,74…”

“…Therefore, the value of conductivity was reduced at higher fraction loading of CoFe 2 O 4 nanoparticles. 73,74 4.6.4 Complex permeability. The real part of the permeability m 0 and the imaginary part of permeability m 00 of the developed nanocomposites have been analyzed at room temperature, to assess the EM wave absorbing performances as a function of frequency as displayed in Fig.…”

Self‐Assembled Woven Ag‐Nanowire 3D Network Film for Ultrathin, Transparent, and Flexible Surface Electromagnetic Interference Shielding

“…As one important wave band in the electromagnetic wave, X-Band electromagnetic waves are the most common used in military and telecommunications devices. [5][6][7][8] Obviously, electromagnetic interference (EMI) is a great challenge in the application of the certain high-end precision scientific and military equipment. For the reflectional EMI shielding materials, EMI shielding is mainly based on electromagnetic wave reflection by charge carriers.…”