Carbon materials and their composites for electromagnetic interference shielding effectiveness in X-band

Attaining low percolation threshold in conductive polypropylene/nitrile rubber thermoplastic vulcanizates using carbon nanotube

“…In fact, EMI SE is governed by important intrinsic properties of the shield including electrical conductivity, dielectric and magnetic properties, as well as the shape and thickness of the sample and nature of the matrix and the filler. The real permittivity (ε′) is related to the material polarization due to movement of charges caused by the external electrical field, while the imaginary permittivity (ε″) is a response of the electric energy dissipation 28 . As observed in Figure 13c,d, the TPV‐II presented higher real (ε′) and imaginary (ε″) permittivity values than TPV‐I.…”

“…Conductive polymeric composites have been extensively used on the development of EM shielding/absorbing materials due to their light weight, versatility and cost‐effective of preparation and processability 28 . This research has been sustained by the intensive growth of EM devices in telecommunications and electro‐electronic industries and also due to the increased military interest in stealth technology, in which the absorbing materials interact with the radar signal thus canceling its reflection.…”

Recent Development in Fabrication of Co Nanostructures and Their Carbon Nanocomposites for Electromagnetic Wave Absorption

“…[3][4][5] The key solution to address this critical issue is to develop high-efficiency EM wave absorption materials, which are capable of converting incident EM waves into thermal energy through their magnetic or dielectric loss ability. [6][7][8][9][10][11][12][13] Ideal EM wave absorbers (EMAs) should meet the demands of lightweight, strong absorption, thin thickness and broad absorbing bandwidth. Among the various kinds of EM wave absorption materials, the ferromagnetic metals, especially cobalt (Co) materials have attracted great interests because of their unique features including large saturation magnetization, high Snoek's limit, compatible dielectric loss and distinguishable permeability in GHz frequency range.…”

Ionic liquids as dispersing agents of graphene nanoplatelets in poly(methyl methacrylate) composites with microwave absorbing properties

“…[1][2][3] Among several conducting fillers, graphite flakes, expanded graphite (EG), and exfoliated graphene nanoplatelets (GNP) have been received great interest due to their intrinsic electrical conductivity and the possibility of low cost and large-scale production, when compared with carbon nanotubes. [4][5][6][7] The electrical conductivity and EMI shielding effectiveness (EMI SE) and/or microwave absorbing properties of GNP-based composites strongly depend on the dispersion of GNP within a matrix, which in turn depends on the methodology used for the graphene preparation. Therefore, GNP samples with different amounts of graphite layers stacked together with a wide range of average thickness are available.…”