Hollow graphite spheres embedded in porous amorphous carbon matrices as lightweight and low-frequency microwave absorbing material through modulating dielectric loss

Liu, Wei; Tan, Shujuan; Yang, Zhihong; Ji, Guangbin

doi:10.1016/j.carbon.2018.06.009

Cited by 194 publications

(55 citation statements)

References 46 publications

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“…As shown in Figure 5a, the real part of complex permittivity (ε′) of all CM samples delivers a downward trend with increasing frequency in the range of 2-18 GHz, which is in accordance with the Debye theory. [38,57] The corresponding values of the imaginary part (ε′′) of these samples fluctuate in the test frequency range and contain several relaxation peaks. Meanwhile, the dielectric loss tangent (tanδ e = ε′′/ε′) of CM exhibits similar trends with the ε′′, indicating the multiple polarization relaxation processes.…”

Section: Em Wave Absorption Properties Of Cf@mxene@mosmentioning

confidence: 99%

Hierarchical Carbon Fiber@MXene@MoS₂ Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Wang

Liu

Jiao

et al. 2020

Adv Funct Materials

394

184

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Microcosmic 3D hierarchical structural design has proved to be an effective strategy to obtain high-performance microwave absorbers, although the treatments to low-dimensional cells in monolithic framework are usually based on semiempirical rules. In this work, a hierarchical carbon fiber (CF)@MXene@MoS 2 (CMM) core-sheath synergistic structure with tunable and efficient microwave absorption (MA) properties is fabricated by introducing self-assembled Ti 3 C 2 T x MXene on the surface of CF and subsequent anchoring of MoS 2. By the synergistic effects from the MXene sheath increasing the conductive loss and MoS 2 at the outermost layer improving the impedance matching, the MA performance of CMM can be effectively regulated and optimized: the optimal reflection loss is −61.51 dB with a thickness of 3.5 mm and the maximum effective absorption bandwidth covers the whole Ku-band with 7.6 GHz at 2.1 mm. Meanwhile, the whole X-band absorption can also be achieved with specific MoS 2 loading at an optimized thickness.

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Section: Em Wave Absorption Properties Of Cf@mxene@mosmentioning

confidence: 99%

Hierarchical Carbon Fiber@MXene@MoS₂ Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Wang

Liu

Jiao

et al. 2020

Adv Funct Materials

394

184

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“…(2) After oxidation, free carbon in the outer shell of Co 2 Si@SiC/C/SiOC/SiO 2 /Co 3 O 4 nanoparticles will dominate the electrical conductivity and therefore plays an important role in the resulting dielectric and EMA properties. Under the application of the external EM field, a large number of electrons will be driven to the free carbon, which will lead to the strong conductive loss and thus greatly attenuate the EMWs 13 . In addition, the Co x Si and Co 3 O 4 in nanoparticles make production not only have dielectric loss, but also exhibit magnetic loss capacity through eddy current effect, natural, and exchange resonance, which further improve the EMW absorption performance of nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

“…For example, by inserting a hollow graphite sphere into a porous amorphous carbon matrix, excellent microwave absorption capability can be obtained. 13 The porous nanorod structure of Fe 3 O 4 /NiFe 2 O 4 /Ni can achieve a minimum reflection loss of −58.4 dB at 13.68 GHz when the thickness is 2.1 mm. 14 In general, both the core-shell and porous structures are the most potential factors for fabricating effective EMW absorbing materials.…”

mentioning

confidence: 95%

Polymer‐derived Co₂Si@SiC/C/SiOC/SiO₂/Co₃O₄ nanoparticles: Microstructural evolution and enhanced EM absorbing properties

Zhong

Guan

et al. 2020

J Am Ceram Soc

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With the rapid development of information technology, electromagnetic equipment has been widely used in medical diagnostics, meteorological radar, mobile communications, military aerospace, and other related fields in recent years. 1-5 However, the adverse radiation effects on the human body caused by the application of electromagnetic microwave in military and civilian related fields have made electromagnetic absorbing (EMA) materials gradually become the focus of public attention. 6-8 Especially for the defense military industry, excellent radar absorbing materials need to meet the minimum reflection coefficient (RC min , when RC< −10 dB, has over 90% electromagnetic wave (EMW) attenuation) as low as possible and the widest efficient absorption bandwidth

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“…According to the transmission line theory, microwave absorption characteristics are highly dependent on the complex permittivity and complex permeability of materials. The electromagnetic parameters of functional particle Fe 3 O 4 -rGO are quite different from those of resin and fiber, while the electromagnetic parameters of resin/fiber composites can be improved to a certain extent by increasing its filling amounts [35,36], thereby obtaining better EMW absorbing abilities. The dielectric properties of GF/EP composites filled with different functional particle As is known to all, the real parts (ε′ and μ′) of electromagnetic parameters represent their storage capacities to electromagnetic energy, while the imaginary parts (ε″ and μ″) show their loss capacities to electromagnetic energy [37].…”

Section: Absorbing Property and Mechanism Of Single Layer Fe 3 O 4 -Rmentioning

confidence: 99%

Preparation and properties of functional particle Fe₃O₄-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure

Xue

et al. 2020

Mater. Res. Express

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Microwave absorbing materials have been becoming a countermeasure and security media for radio environment, and also been becoming the main military force attached by the world. In this study, experimental data, theoretical researches and FEKO-a 3D structure and electromagnetic field analysis simulation tool, namely, FEldberechnung bei Korpern mit beliebiger Oberflache, are effectively combined. Through systematic studies on electromagnetic parameters and microwave absorbing properties of high-performance absorbing functional particle Fe 3 O 4 -rGO (i.e. reduced graphene oxide), single-layer composite Fe 3 O 4 -rGO@EP/GF (epoxy/glass fiber) and multi-layer structure composite Fe 3 O 4 -rGO@EP/fiber, combined with the simulation calculations of material structures, design on the microwave absorption performances of fiber/resin structural composites is achieved. In particular, under the guidance of FEKO simulations, a multi-layer structure composite with two layers of Fe 3 O 4 -rGO@EP/GF with different Fe 3 O 4 -rGO added amounts as the absorbing layer and carbon fiber (CF) reinforced EP as the reflecting layer is prepared, which has an effective absorption bandwidth of 8. 43-12.40 GHz, almost covering the whole X-band, and RL min (minimum reflection loss) up to −34.60 dB at 10.37 GHz. The relevant experimental results are basically consistent with the FEKO simulation results. This study is helpful to improve the developing efficiencies and properties of microwave absorbing structure composites with both excellent mechanical properties and outstanding microwave absorbing performances, especially conducive to industrial productions. absorption intensity was −31.0 dB at −9.9 GHz. Se-Won Eun et al [2] produced the tested material glass/EP-MWCNT and introduced the 'split sample' test method, which, used to measure the reflection and absorption to electromagnetic waves, could analyze quantitatively the effects of layering by implementing layering with different thickness and position in the same sample, test results showed that the minimum reflection loss (RL min ) of the material prepared was −52.9 dB, resonance occurring at 10.01 GHz, and the effective absorption bandwidth was 8.3-12.4 GHz, almost covering the whole X-band. In addition, the effects of fiber lamination angle [3], pulp modification degree [4,5] and special hollow fiber [6] on the microwave absorbing properties of composites were studied too. used self-assembly technology to manufacture broadband periodic structural absorbing material with GO solution and PP fabric, through coupling multiple resonances and edge diffraction, the periodic structure absorbing material prepared had more than 90% absorption in the whole measurement frequency range (2-40 GHz, 75-110 GHz); in addition, it showed high absorption intensity (RL <−15 dB) over a wide frequency range (62.73 GHz). Wei-Li Song et al [8] accelerated the design of highefficiency microwave absorbing dielectric composites by allowing attenuation evaluation diagrams; based on this, combined with CST simul...

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Hollow graphite spheres embedded in porous amorphous carbon matrices as lightweight and low-frequency microwave absorbing material through modulating dielectric loss

Cited by 194 publications

References 46 publications

Hierarchical Carbon Fiber@MXene@MoS₂ Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Hierarchical Carbon Fiber@MXene@MoS₂ Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Polymer‐derived Co₂Si@SiC/C/SiOC/SiO₂/Co₃O₄ nanoparticles: Microstructural evolution and enhanced EM absorbing properties

Preparation and properties of functional particle Fe₃O₄-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure

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Hollow graphite spheres embedded in porous amorphous carbon matrices as lightweight and low-frequency microwave absorbing material through modulating dielectric loss

Cited by 194 publications

References 46 publications

Hierarchical Carbon Fiber@MXene@MoS2 Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Hierarchical Carbon Fiber@MXene@MoS2 Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Polymer‐derived Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles: Microstructural evolution and enhanced EM absorbing properties

Preparation and properties of functional particle Fe3O4-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure

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Product

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Hierarchical Carbon Fiber@MXene@MoS₂ Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Hierarchical Carbon Fiber@MXene@MoS₂ Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Polymer‐derived Co₂Si@SiC/C/SiOC/SiO₂/Co₃O₄ nanoparticles: Microstructural evolution and enhanced EM absorbing properties

Preparation and properties of functional particle Fe₃O₄-rGO and its modified fiber/epoxy composite for high-performance microwave absorption structure