Mesoporous Fe/C and Core–Shell Fe–Fe3C@C composites as efficient microwave absorbents

Performance enhanced electromagnetic wave absorber from controllable modification of natural plant fiber

“…3b, the as-prepared sample ACR, CR and FCR all present a high I D /I G value that is greater than 1.5, and the corresponding values are 1.94, 1.76, and 1.83, respectively. In contrast to other published works which focus on chemically synthesized carbonaceous materials in this eld, [33][34][35][36][37] the carbon rods derived from sisal ber give rare and noticeable high I D /I G value due to low graphitization degree, in other words, plenty of defects exist in the amorphous/disorder carbon. The trace metal ions in sisal ber, serving as doped heteroatoms, are much likely to cause the lattice distortions of surrounding carbon and facilitate the generation of various defects such as vacancies and misshapen grain boundaries or any others during calcination.…”

Controllable synthesis of unique Ni/mesoporous carbon composites with lightweight and high EM wave absorption performance

“…(i) As one of the most excellent conductor, addition of nickel strongly enhanced the conductivity and polarizability of DMC. 18 This can be qualitatively understood according to the effective medium approximation. 28 (ii) With the tremendous interface generated, introduction of Ni particles in nanoscale may bring on extra interfacial polarization arise from charge transfer between the two discontinuous dielectrics.…”

“…16 The study conducted by Wang 17 has provided a valid point that both the pore size and the electromagnetic parameters (3 r , m r ) of ordered mesoporous carbon (OMC) could be conveniently regulated through hybrid with semi-conductive nano-TiO 2 , which herein lead to obvious improvement of the EM absorption properties due to the enhanced resonance dielectric loss. Alternatively, aiming to realize the synergistic EM absorption through multiple mechanisms (dielectric and magnetic), magnetic components like iron oxide, 18,19 cobalt ferrite 20 have been also introduced into the order mesoporous carbon. For example, Wu et al 21 synthesized the porous ower-like Fe 2 O 3 /OMC nanocomposites and proved that the Fe 2 O 3 of special geometric morphology is favourable to both the microwave absorption efficiency and bandwidth.…”

Microwave Absorption of Crystalline Fe/MnO@C Nanocapsules Embedded in Amorphous Carbon

“…Specially, massive efforts have been devoted continuously to developing absorbers, constituting carbon materials and magnetic metal iron composition recently. In past, the multicomponent hybrids Fe@C nanocapsules [ 27 ], Fe–C nanofibers [ 28 ], graphene-coated Fe nanoparticles [ 29 ], Fe@C microspheres [ 1 ], mesoporous Fe/C composition [ 30 ], C@Fe 2 O 3 /Fe 3 C/Fe–CNT nanoparticle decorated carbon nanotubes [ 31 ] display good electromagnetic absorption capabilities and wide effective frequency range to some extent.…”