Electromagnetic absorption properties of graphene/Fe nanocomposites

Graphene nanosheet- and flake carbonyl iron particle-filled epoxy–silicone composites as thin–thickness and wide-bandwidth microwave absorber

“…For example, the RL values of Sample 3 below À5 dB were obtained in the frequency range of 6.9-18 GHz with a thickness of 0.7 mm, and the RL values of Sample 1 below À10 dB were obtained in the frequency range of 10.5-18 GHz with a thickness of 1.0 mm. Detailed EM properties and RL of GN/FCI particle/ epoxy-silicone composites and a comparison of other representative GP/magnetic particle composites [28][29][30][31][32][33][34][35][36][37][38][39][40]42,51] are summarized in Tables 1 and 2. These results indicate that GN/FCI particle-filled composites with wider microwave absorption bandwidth and/or thinner thicknesses can be obtained simply by using GNs and FCI particles as the absorber and then optimizing the filler content and properties.…”

“…In order to effectively improve their absorptions, attention has been directed toward adding magnetic materials to GP-filled composites to enhance their complex permeability. Therefore, GP/magnetic particle-filled composites as MAMs, such as GP/ Fe, GP/Fe 3 O 4 , GP/MnFe 2 O 4 , GP/CoFe 2 O 4 , GP@Fe 3 O 4 @SiO 2 @NiO, and GP/NiFe 2 O 4 , have been intensively investigated to improve the microwave absorption of GP-filled composites [28][29][30][31][32][33][34][35][36][37][38][39][40]. For example, GP/Fe-filled composites with ferromagnetic properties were fabricated and such composites exhibited enhanced EM absorption properties.…”

“…For example, GP/Fe-filled composites with ferromagnetic properties were fabricated and such composites exhibited enhanced EM absorption properties. The maximum reflection loss (RL) of GP/Fe composites was up to À31.5 dB at 14.2 GHz with a thickness of 2.5 mm [30]. A novel kind of Fe 3 O 4 hollow sphere/ reduced graphene oxide (RGO) composite has been synthesized by a facile solvothermal method.…”

“…Although these reported studies have highlighted that the complex permittivity and permeability of the composite should be tailored properly to improve the microwave absorption of the GP/magnetic particle-filled composite [28][29][30][31][32][33][34][35][36][37][38][39][40], none has produced a MAM that fulfills the demand for a large absorption, wide working frequency bandwidth, and thin thickness. Therefore, up to now, it is still a challenge to design and fabricate GP/magnetic particle-filled composite to satisfy the demand of ideal MAMs.…”

Adsorption Properties and Potential Applications of Bamboo Charcoal: A Review

“…Based on that, carbon material like carbon black [20], carbon nanotubes [21] and graphene [22 -24] have been used as the polymeric filler because of their extraordinary properties. However the production of these carbon materials is expensive and some of the materials are facing impedance match mechanism that may harmful to the EM adsorption properties [24]. Besides, the carbon based dielectric absorbers have narrow absorbing frequency bandwidth [25].…”