Electromagnetic absorbing properties of graphene–polymer composite shields

Highly conductive multilayer-graphene paper as a flexible lightweight electromagnetic shield

“…Carbon-nanostructures (such as CNTs, MLG or rGO) have been widely used as filler in polymermatric composites, in order to obtain novel multifunctional materials with enhanced electrical conductivity and/or tailored dielectric permittivity for EM applications [17][18][19][20][21][22][23][24][25][26], or high thermal conductivity for use in thermal management problems [27][28][29]. In particular, it has been shown that polymer-matrix composites filled with CNTs, GNPs or rGO have interesting properties for application in radar absorbing materials when backed over metallic reflecting surfaces [21,23,25].…”

“…However, their use in EM shielding metal-free solutions is possible but of limited interest in most cases, since shielding effectiveness of GNP-filled composites is typically limited to 20 dB with shield thickness in the range of one up to few millimeters and filler concentrations up to 2-4% [22,24]. In [26] Wen et al demonstrated that the EM shielding factor of graphitized rGO / SiO 2 composite containing 20 wt % rGOs and with thickness of 1.5 mm reaches 38 dB at 473 K. A filler amount higher than a few percent in weight alters the mechanical properties of the composite because of serious filler agglomeration [23,29], which also limits the formation of percolating network in the composite matrix [30].…”

Preparation and Performance of PVC/CNT Nanocomposite

“…The different types of conducting nanofillers such as carbon nanotube (CNT), carbon nanofiber (CNF), grapheme, and its derivatives have been extensively used for the preparation of conducting polymer nanocomposite. [6][7][8] However, these nanofillers are facing several problems such as (i) due to strong van der Walls interaction among the nanofillers, dispersion of the nanofillers is difficult throughout the composite; and (ii) very high cost of the nanofillers. Thus, preparation of conducting polymer nanocomposite at low nanofillers loading has been a great challenge, which can reduce the production cost and extensively increase the applicability of the conducting polymer nanocomposite.…”

Hierarchical electromagnetic absorption in micro-waveguide stuffed with magnetic media for resin-based composites of graphene nanosheets and manganese oxides

“…Microwave absorbers absorb EM energy and then dissipate it into heat energy, via both dielectric and magnetic loss. Therefore, the preparation of composite materials, containing both electric and magnetic components, and their microwave absorbing properties have been extensively investigated for many years [1,[4][5][6][7][8][9]. A suitable absorbing material is the presupposition in engineering design.…”

“…The electric conductive components are multi-walled carbon nanotubes [8], carbon black [10], active carbon-carbon fibers [16] and graphene materials [14]. The matrix for the fixation and formation of fillers includes paraffin wax [8], epoxy resin [4,9], rubber [5], polyvinylidene fluoride [14], waterborne polyurethane [15] etc. Single electric application or magnetic application also has been reported in literatures [17][18][19][20][21], as the respective type of dielectric or magnetic loss absorbers.…”