Fabrication of porous graphene-Fe 3 O 4 hybrid composites with outstanding microwave absorption performance

Zheng, Yiwei; Wang, Xiaoxia; Wei, Shuang; Zhang, Baoqin; Yu, Mingxun; Zhao, Wei; Liu, Jingquan

doi:10.1016/j.compositesa.2017.01.015

Cited by 113 publications

(24 citation statements)

References 64 publications

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“…It can be seen that Fe/Fe 3 O 4 /C-40 and Fe/Fe 3 O 4 /C-90 exhibit larger values of ɛ′ and ɛ′′ than that of the carbon microspheres (derived from PS microspheres), which could originate from the improvement of the polarization of magnetic domains in the Fe 3 O 4 [52, 53]. The complex permittivity of all the samples are declined with the promotion of frequency,which is attributed to the hysteresis of the induction charge and the decrease of the space charge polarization[54]. A significant fluctuation at the range of 12-13 GHz could imply a local inhomogeneity of the defects in the three samples[55].…”

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confidence: 99%

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

Meng

Zhang

et al. 2018

Ceramics International

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Carbon materials have aroused extensive interests for their remarkable electrical properties as electromagnetic wave (EMW) absorption. However, the synthesis of the wide-band electromagnetic wave absorbent is an insuperable challenge for attaining effective refection loss and electromagnetic matching. Herein, a facile method for large-scale synthesis of monodispersed Fe/Fe 3 O 4 /C composite microspheres is proposed. The carbon microspheres (1-2 μm in diameter) imbedded with nanosized Fe/Fe 3 O 4 2 particles (10-20 nm) are uniformly produced by polymerization and carbothermic reduction processes. The products exhibit the minimum refection loss-45.5 dB at 9.4 GHz and a broad bandwidth of 4.1 GHz below-10 dB from 7.8 GHz to 11.9 GHz with a thickness of 3.0 mm. The absorption mechanism indicates a unique deviated Debye dipolar relaxation effect in the absorbing bandwidth.

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confidence: 99%

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

Meng

Zhang

et al. 2018

Ceramics International

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“…Due to the domain wall, resonance losses usually occur in the low frequency range (1–100 MHz) and the effect of hysteresis losses can be negligible in the weak magnetic field; therefore, it can be concluded that eddy current losses and natural resonance losses play a major role in the magnetic loss of materials [ 31 ]. The Eddy current loss in a material is usually characterized by the eddy current loss coefficient (C 0

), and when eddy current loss occurs inside the materials, C 0 should be a constant [ 50 ]. However, in Figure 7 c, the C 0 curves decrease with the frequency, indicating that the major source of magnetic loss in the CoS@Fe 3 O 4 @rGO aerogel is natural resonance.…”

Section: Resultsmentioning

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Superior Microwave Absorption Properties Derived from the Unique 3D Porous Heterogeneous Structure of a CoS@Fe3O4@rGO Aerogel

Liu

Wang

et al. 2020

Materials

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A novel CoS@Fe3O4@rGO aerogel with a unique 3D porous heterostructure was prepared via the solvothermal method, in which cobalt sulfide (CoS) microspheres embedded with Fe3O4 nanoparticles were randomly scattered on reduced graphene oxide (rGO) flakes. The introduction of magnetic Fe3O4 nanoparticles and rGO regulated the impedance matching, and the excellent electromagnetic wave (EMW) absorption capability of the CoS@Fe3O4@rGO aerogel could be attributed to optimal dielectric loss and abundant conductive networks. The results demonstrated that the minimum reflection loss (RL) value of CoS@Fe3O4@rGO aerogel was −60.65 dB at a 2.5 mm coating thickness with an ultra-wide bandwidth of 6.36 GHz (10.24–16.6 GHz), as the filler loading was only 6 wt%. Such a lightweight CoS@Fe3O4@rGO aerogel with an outstanding absorbing intensity and an ultra-wide effective absorption bandwidth could become a potential EMW absorber.

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“…The attenuation constant a indicates the capability of dissipating incident EMW,w hich can be figuredo ut by Equation (7): [28] a ¼ ffiffi ffi 2 p pf c ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi m 00 e 00 Àm 0 e 0 ðÞ þ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi m 00 e 00 Àm 0 e 0 ðÞ 2 þ m 0 e 00 Àm 00 e 0 ðÞ 2 q r ð7Þ…”

Section: Resultsunclassified

Facile Preparation of Snowflake‐Like MnO₂@NiCo₂O₄ Composites for Highly Efficient Electromagnetic Wave Absorption

Wei

Wang

Zheng

et al. 2019

Chemistry A European J

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Snowflake-like MnO 2 @NiCo 2 O 4 composites were successfully fabricated by employingc rossed snowflake-like MnO 2 nanorodsa sc ores and one-dimensional (1D) NiCo 2 O 4 nanoneedles as shells.I mpressively, the MnO 2 @NiCo 2 O 4 compositese xhibited ah ighly efficient electromagnetic wave (EMW) absorbing capability,a nd the minimum reflection loss (RL) value reached À58.4 dB at 6.8 GHz forathickness of 4.0 mm. The reasons for the improvedE MW absorption capabilityo fs nowflake-like MnO 2 @NiCo 2 O 4 compositesw ere analyzed. The unique core-shell structure, good impedance matching, and high dielectricl oss were all found to be important contributors. Moreover,t he interfacial polarization mainly stemmedf rom the heterostructure, am icrocurrent generated from the 1D MnO 2 nanorods and NiCo 2 O 4 nanoneedles under alternating electromagnetic fields, and the synergistic effect from the differentc omponents werea ll beneficial to improve the EMW absorption performance. These results demonstrated that snowflake-like MnO 2 @NiCo 2 O 4 composites could be utilizeda sp romising materials for practical EMW absorbinga pplications.[a] S.

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Fabrication of porous graphene-Fe 3 O 4 hybrid composites with outstanding microwave absorption performance

Cited by 113 publications

References 64 publications

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

Superior Microwave Absorption Properties Derived from the Unique 3D Porous Heterogeneous Structure of a CoS@Fe3O4@rGO Aerogel

Facile Preparation of Snowflake‐Like MnO₂@NiCo₂O₄ Composites for Highly Efficient Electromagnetic Wave Absorption

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Fabrication of porous graphene-Fe 3 O 4 hybrid composites with outstanding microwave absorption performance

Cited by 113 publications

References 64 publications

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

Superior Microwave Absorption Properties Derived from the Unique 3D Porous Heterogeneous Structure of a CoS@Fe3O4@rGO Aerogel

Facile Preparation of Snowflake‐Like MnO2@NiCo2O4 Composites for Highly Efficient Electromagnetic Wave Absorption

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Facile Preparation of Snowflake‐Like MnO₂@NiCo₂O₄ Composites for Highly Efficient Electromagnetic Wave Absorption