One-step hydrothermal synthesis and enhanced microwave absorption properties of Ni0.5Co0.5Fe2O4/graphene composites in low frequency band

Peng, Yin; Deng, Yu; Zhang, Limin; Wu, Wenjing; Wang, Jian; Feng, Xiqi; Sun, Xiaowei; Li, Huayao; Yu, Tao

doi:10.1016/j.ceramint.2018.08.096

Cited by 63 publications

(16 citation statements)

References 39 publications

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“…According to the microwave absorption mechanism, when absorbers have magnetic loss, dielectric loss, and impedance match, more microwaves can enter the interior of the materials and be converted into other forms of energy and dissipated [8,9]. In past decades, many efforts were devoted to researching composites for enhancing microwave absorption, such as (Fe, Ni, Co)/C [10][11][12], (Fe, Ni, Co)/rGO [13][14][15], MFe 2 O 4 /rGO (M = Fe, Ni, Co) [16][17][18][19], MFe 2 O 4 / CNTs [20][21][22], and NiO/SiO 2 /Fe 3 O 4 /rGO [23,24]. However, these materials have the shortcoming of narrow absorption bands, which seriously hinders their practical applications.…”

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confidence: 99%

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Wang

et al. 2019

Nano-Micro Lett.

151

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HIGHLIGHTS• Hierarchically porous Fe-Co/N-doped carbon/rGO (Fe-Co/NC/rGO) composites were successfully prepared. Macropores, mesopores, and micropores coexisted in the composites.• Hierarchically porous Fe-Co/NC/rGO showed effective bandwidth of 9.29 GHz.ABSTRACT Developing lightweight and broadband microwave absorbers for dealing with serious electromagnetic radiation pollution is a great challenge. Here, a novel Fe-Co/N-doped carbon/reduced graphene oxide (Fe-Co/NC/rGO) composite with hierarchically porous structure was designed and synthetized by in situ growth of Fe-doped Cobased metal organic frameworks (Co-MOF) on the sheets of porous cocoon-like rGO followed by calcination. The Fe-Co/NC composites are homogeneously distributed on the sheets of porous rGO. The Fe-Co/NC/rGO composite with multiple components (Fe/Co/NC/rGO) causes magnetic loss, dielectric loss, resistance loss, interfacial polarization, and good impedance matching. The hierarchically porous structure of the Fe-Co/NC/rGO enhances the multiple reflections and scattering of microwaves. Compared with the Co/NC and Fe-Co/NC, the hierarchically porous Fe-Co/NC/rGO composite exhibits much better microwave absorption performances due to the rational composition and porous structural design. Its minimum reflection loss (RL min ) reaches − 43.26 dB at 11.28 GHz with a thickness of 2.5 mm, and the effective absorption frequency (RL ≤ − 10 dB) is up to 9.12 with the same thickness of 2.5 mm. Moreover, the widest effective bandwidth of 9.29 GHz occurs at a thickness of 2.63 mm. This work provides a lightweight and broadband microwave absorbing material while offering a new idea to design excellent microwave absorbers with multicomponent and hierarchically porous structures.

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confidence: 99%

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Wang

et al. 2019

Nano-Micro Lett.

151

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“…Moreover, the relaxation process of heterogeneous interface polarization can be presented by the Cole–Cole semicircle, which has an important influence on the dielectric loss behaviors of electromagnetic wave absorbing materials. According to the Debye dipolar relaxation theory, the complex permittivity can be expressed as follows 52 where ε s is the static dielectric constant and ε ∞ is the dielectric constant at infinite frequency. The ε′−ε″ curves of the Ni x Mn 1– x Fe 2 O 4 /carbonized chaff are shown in Figure 10; however, one semicircle can be observed in each sample, indicating the existence of only one Debye dipolar relaxation during the EM wave absorption process.…”

Section: Results and Discussionmentioning

confidence: 99%

Novel Microwave Absorber of Ni_xMn_1–xFe₂O₄/Carbonized Chaff (x = 0.3, 0.5, and 0.7) Based on Biomass

Peng

Zhang

et al. 2019

ACS Omega

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A novel magnetic nanocomposite of Ni x Mn 1– x Fe 2 O 4 /carbonized chaff ( x = 0.3, 0.5, and 0.7) has been synthesized successfully via the co-carbonization and hydrothermal method. The microstructure, morphology, complex permittivity and permeability, and microwave absorbing properties were systematically studied by X-ray diffraction, scanning electron microscopy, and a vector network analyzer. Compared to the pure Ni 0.5 Mn 0.5 Fe 2 O 4 NPs, the Ni 0.3 Mn 0.7 Fe 2 O 4 /carbonized chaff-N 2 composite exhibits an optimal microwave absorption property at 4 mm as the mass percent of carbonized chaff is 10 wt %, the maximum reflection loss of which can reach −14.58 dB at 1.91 GHz with the −10 dB frequency bandwidth in the range of 1.46–2.41 GHz (0.95 GHz). The enhanced electromagnetic wave absorbing performance is ascribed to the good synergistic effect among laminated structures, better impedance matching condition, strong natural resonance loss, Debye dipolar relaxation to some extent, and so forth. Most importantly, this study provides a novel way to prepare easily degradable, environment-friendly, and high-efficiency electromagnetic wave absorbers by utilizing the structural property of renewable biomaterials.

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“…• Nanoparticles formation is slow Hydrothermal method [41,[48][49][50][51][52][53][54][55][56] It involves substance crystallization at high temperature and pressure.…”

Section: Discussion Of Articlesmentioning

confidence: 99%

Preparation methods for Graphene, Metal and Polymer-based Composites for EMI Shielding Materials: State of the Art of Conventional and Machine Learning Methods

Ayub¹,

Guan²,

Ahmad³

et al. 2021

Preprint

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The electromagnetic inference is an issue from decades, where working for a better shielding material is still on-going. The purpose of this study is to review the existing methods in the formation of graphene, metal and polymer-based composites. Study indicates that in graphene and metal-based composites, the utilization of alternating deposition method showed the highest shielding effectiveness, whereas, in polymer-based composite, the utilization of chemical vapor deposition method showed highest shielding effectiveness. However, this review reveals that still there is a gap in the literature in terms of the selection of the method. Although there are various available methods which researchers adopt as per their convenience, none of the studies makes a comparison of the methods to form a similar composite. Therefore, as a future gap researcher needs to adopt various methods to form a single composite and then make a comparison of shielding effectiveness. This act will be useful for future researchers to select the appropriate method.

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One-step hydrothermal synthesis and enhanced microwave absorption properties of Ni0.5Co0.5Fe2O4/graphene composites in low frequency band

Cited by 63 publications

References 39 publications

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Novel Microwave Absorber of Ni_xMn_1–xFe₂O₄/Carbonized Chaff (x = 0.3, 0.5, and 0.7) Based on Biomass

Preparation methods for Graphene, Metal and Polymer-based Composites for EMI Shielding Materials: State of the Art of Conventional and Machine Learning Methods

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One-step hydrothermal synthesis and enhanced microwave absorption properties of Ni0.5Co0.5Fe2O4/graphene composites in low frequency band

Cited by 63 publications

References 39 publications

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Novel Microwave Absorber of NixMn1–xFe2O4/Carbonized Chaff (x = 0.3, 0.5, and 0.7) Based on Biomass

Preparation methods for Graphene, Metal and Polymer-based Composites for EMI Shielding Materials: State of the Art of Conventional and Machine Learning Methods

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Novel Microwave Absorber of Ni_xMn_1–xFe₂O₄/Carbonized Chaff (x = 0.3, 0.5, and 0.7) Based on Biomass