Facile synthesis and enhanced electromagnetic wave absorption of thorny-like Fe–Ni alloy/ordered mesoporous carbon composite

Guo, Shaoli; Wang, Liuding; Wu, Hongjing

doi:10.1016/j.apt.2015.06.007

Cited by 47 publications

(11 citation statements)

References 24 publications

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“…It is well-known that the absorption properties of absorbers are determined by their complex permittivity, permeability, and impendence matching at the air and absorbers interface. Therefore, to meet the demand of strong absorption in a wide frequency range, carbon materials are usually prepared with composites with magnetic materials, such as magnetic carbon fibers, , carbon nanotubes, , graphenes, , carbon spheres − and porous carbon composites. , …”

Section: Introductionmentioning

confidence: 99%

Microwave Electromagnetic and Absorption Properties of N-Doped Ordered Mesoporous Carbon Decorated with Ferrite Nanoparticles

Shen

Mei

et al. 2017

J. Phys. Chem. C

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Lightweight nitrogen-doped ordered mesoporous carbon (NOMC) with high specific surface area and pore volume have been prepared through self-assembly and subsequent heat treatment route. The spherical NOMC particles are decorated with CoFe2O4 nanoparticles via coprecipitation method to enhance their microwave absorption property. The electromagnetic parameters of the NOMC and CoFe2O4/NOMC composites are measured and the microwave reflection loss properties are evaluated in the frequency range of 0.5–18 GHz. The results show that both the real part and imaginary part of permittivity of NOMC totally decline and the real part of permeability increases with the introduction of ferrite. However, the negative values of the imaginary part of the complex permeability appear for the CoFe2O4/NOMC composites, which may be caused by enhanced eddy current effect due to the introduction of ferrite. The reflection loss results exhibit that the CoFe2O4/NOMC composites have excellent microwave absorption performances. The absorption bandwidth less than −10 dB reaches 5.0 GHz (11.9–16.9 GHz) for 40-F/NOMC composite (40 wt % ferrite) with 1.5 mm of thickness and the minimum reflection loss value is up to −38.3 dB at 3.9 GHz for 30-F/NOMC composite with 4.0 mm of thickness. The excellent absorption properties derive from the synergistic effect between dielectric loss of NOMC and magnetic loss of ferrite and better impendence matching at air and ferrite/NOMC composite interface. Thus, the lightweight ferrite/NOMC composites exhibit their great potential as microwave absorbing materials.

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Section: Introductionmentioning

confidence: 99%

Microwave Electromagnetic and Absorption Properties of N-Doped Ordered Mesoporous Carbon Decorated with Ferrite Nanoparticles

Shen

Mei

et al. 2017

J. Phys. Chem. C

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“…Obviously, the uctuation trend of tan d 3 is just inverse to that of tan d m , which can be interpreted by LRC equivalent circuit model, where L, R and C are the inductance, resistance and capacitance, respectively. 16,56 Moreover, the attenuation constant (a) can be employed to further assess the integrated damping capability of the material taking into account of both dielectric loss and magnetic loss, and be calculated by the following equation:…”

mentioning

confidence: 99%

Economical synthesis of composites of FeNi alloy nanoparticles evenly dispersed in two-dimensional reduced graphene oxide as thin and effective electromagnetic wave absorbers

Zhang

et al. 2018

RSC Adv.

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a Developing electromagnetic wave absorbing materials prepared by a facile and economical way is a great challenge. Herein, we report a feasible route to synthesize a series of two-dimensional FeNi/rGO composites by a hydrothermal method followed by a carbonization process. The characterization confirms that nano-sized FeNi alloy nanoparticles are evenly supported onto graphene sheets without aggregation. The homogeneous dispersion of the nanoparticles may result from the introduction of glucose and the oxygen-containing groups on the surface of the graphene oxide. Measurements show that the microwave attenuation capability of the composites can be improved dramatically by adjusting the proportion of dielectric and magnetic components. Consequently, the two-dimensional magnetic material (FeNi/rGO-100) exhibits an excellent microwave absorption performance. In detail, the minimum reflection loss of À42.6 dB and effective bandwidth of 4.0 GHz can be reached with a thinner thickness of 1.5 mm. This study demonstrates that synergistic effects among the magnetic particles, reduced graphene oxide and amorphous carbon layers give rise to the highlighted microwave attenuation ability. Overall, the FeNi/rGO composite is a promising candidate to be used as a microwave absorber, and the feasible and economical method has shown potential application to construct multitudinous two-dimensional materials.

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“…This phenomenon can be explained by the fact that eddy current can be easily formed in the high conductive materials under the action of alternating electromagnetic field, which conversely induce new magnetic field. Once the conductivity of material approaches the percolation threshold, the resultant eddy current will shield the penetration of EMW and radiate the magnetic energy out of absorber, reducing its permeability and producing eddy current loss ( Zhang et al., 2020 ; Guo et al., 2015 ; Yang et al., 2022 ). Additionally, the small fluctuation at about 4.5 GHz originates from natural resonance, which verified by the distinct resonance peak at the same frequency in tan μ ∼ f carves ( Figure S9 F).…”

Section: Resultsmentioning

confidence: 99%

Microstructure induced dielectric loss in lightweight Fe3O4 foam for electromagnetic wave absorption

et al. 2022

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Facile synthesis and enhanced electromagnetic wave absorption of thorny-like Fe–Ni alloy/ordered mesoporous carbon composite

Cited by 47 publications

References 24 publications

Microwave Electromagnetic and Absorption Properties of N-Doped Ordered Mesoporous Carbon Decorated with Ferrite Nanoparticles

Microwave Electromagnetic and Absorption Properties of N-Doped Ordered Mesoporous Carbon Decorated with Ferrite Nanoparticles

Economical synthesis of composites of FeNi alloy nanoparticles evenly dispersed in two-dimensional reduced graphene oxide as thin and effective electromagnetic wave absorbers

Microstructure induced dielectric loss in lightweight Fe3O4 foam for electromagnetic wave absorption

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