Effect of absorbers' composition on the microwave absorbing performance of hollow Fe3O4 nanoparticles decorated CNTs/graphene/C composites

Zhang, Kaichuang; Zhang, Qian; Gao, Xinbao; Chen, Xuefang; Wang, Yi; Li, Wangchao; Wu, Jingyi

doi:10.1016/j.jallcom.2018.03.202

Cited by 89 publications

(26 citation statements)

References 49 publications

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“…This enhancement could be associated with improved conductivities, and this alternatively shows consistency with the effective medium theory [21]. Figure 7a shows that the ε decreased slowly with an increase in frequency (X-band) showing a distinctive frequency dispersion seen in many Fe 3 O 4 -based composites [12,22,23]. Such phenomenon occurs when dipoles could not respond quickly to the high-frequency alternating E-Field, resulting in a decrease in the magnitude ε and ε" [24].…”

Section: Em Wave Absorption Propertiessupporting

confidence: 69%

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

et al. 2019

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Magnetite (Fe 3 O 4 ) have been thoroughly investigated as microwave absorbing material due to its excellent electromagnetic properties (permittivity and permeability) and favorable saturation magnetization. However, large density and impedance mismatch are some of the limiting factors that hinder its microwave absorption performance (MAP). Herein, Fe 3 O 4 nanoparticles prepared by facile co-precipitation method have been coated with citric acid and embedded in a polyvinylidene fluoride (PVDF) matrix. The coated Fe 3 O 4 nanoparticles were characterized by X-ray diffraction spectrometer (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometer (VSM). COMSOL Multiphysics based on the finite element method was used to simulate the rectangular waveguide at X-band and Ku-band frequency range in three-dimensional geometry. The citric acid coated Fe 3 O 4 /PVDF composite with 40 wt.% filler loading displayed good microwave absorption ability over the studied frequency range (8.2-18 GHz). A minimum reflection loss of −47.3 dB occurs at 17.9 GHz with 2.5 mm absorber thickness. The composite of citric acid coated Fe 3 O 4 and PVDF was thus verified as a potential absorptive material with improved MAP. These enhanced absorption coefficients can be ascribed to favorable impedance match and moderate attenuation. Appl. Sci. 2019, 9, 3877 2 of 17 attracted much interest in the field of EM wave absorption. However, Fe 3 O 4 as an absorptive material have some limitations such as the rapid decrease in permeability value at microwave frequency, large density, ease of oxidation and mismatch of impedance which impedes its performance as an ideal MAM [6,7].Recently, several research efforts have been geared towards improving the microwave absorption performance (MAP) of Fe 3 O 4 . For example, Mingxu et al. [8] fabricated hollow Fe 3 O 4 nanoparticles via solvothermal route, with the aim of reducing its density while retaining good magnetic properties for efficient MAP. They established improved EM wave absorption with increasing particle size and change in morphology. Maximum EM absorption with RL value of −55.14 dB at 11.76 GHz was achieved with an absorber thickness of 2.07 mm. Guiquig et al. [9] synthesized nano-Fe 3 O 4 by an innovative wet chemical route, employing hydrazine hydrate as anti-oxidation agent. The synthesized Fe 3 O 4 nanoparticle of average diameter of 77 nm possessed high magnetization saturation and coercivity value of 72.36 emu/g and 95 Oe, respectively. The minimum RL value of −21.2 dB was achieved with 6 mm thickness. Similarly, optimization of the MAP of Fe 3 O 4 via design and fabrication of hierarchical nanostructure have also been explored. Chaomie et al. [10] exploit one-step and template-free synthesis method to prepare octahedral Fe 3 O 4 nanostructure by direct decomposition of an iron organic compound with molten salt. The sample annealed at 800 • C displayed maximum EM absorption of −23.67 dB at 15.24 GHz at a ...

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Section: Em Wave Absorption Propertiessupporting

confidence: 69%

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

et al. 2019

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“…The surface of the CF that is not covered with the BN coating contains no film, and only the magnetic particles are distributed. After the metal salt is impregnated, the surface of the fiber is uniformly distributed with magnetic particles, and the larger the concentration of the metal salt is, the larger are the magnetic particles [16]. The concentration of boric acid is different, and the surface morphology of the CF is also different.…”

Section: Morphological Analysesmentioning

confidence: 99%

“…At the same time, the surface of the fiber is evenly distributed with soft magnetic particles composed of elements, such as Fe, Co, and Ni. These magnetic particles have obvious absorbing properties and are commonly used for electromagnetic wave absorption [15,16]. Additionally, various EM-absorbing materials form a special structure on the surface of the fiber and have a rich interfacial polarization that is beneficial to the improvement of the EM wave absorption performance of the material.…”

Section: Morphological Analysesmentioning

confidence: 99%

“…Studies have shown that the introduction of metals, magnetic particles, high-molecular polymers, and ceramic equivalents on the surface of the CFs can effectively improve the electromagnetic properties of carbon fibers [11][12][13]. If nickel and Fe 3 O 4 are coated on the surface of the CF using electroless plating [14,15], or if magnetic particles are formed on its surface in situ [16], the CF-based composite prepared by these surface modifications has an EM wave absorption performance that is superior to that of pure CF. Although various modifications of CF can improve the EM absorption properties of the material, the CF itself and the added metal and magnetic particles are exposed to air, especially in a high-temperature environment, thus making it susceptible to oxidation or corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…When the metal salt concentration was high, the magnetic particles supported on the fiber surface became larger. An excessive number of magnetic particles make the EM wave absorption process ineffective [16]. Similarly, the variation of the thickness of the BN coating on the surface of CF also affected the EM wave-absorbing composites in which the three-dimensional network structure and various lossy materials worked synergistically.…”

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confidence: 99%

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Effects of Boron Nitride Coatings at High Temperatures and Electromagnetic Wave Absorption Properties of Carbon Fiber-Based Magnetic Materials

Sun

Cheng

et al. 2020

Journal of Nanomaterials

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An electromagnetic (EM) wave-absorbing material with a three-layer structure is prepared by depositing magnetic particles and a high-temperature resistant coating on the surface of the carbon fiber (CF) with in situ hybridization. Accordingly, the structure, chemical composition, morphology, high-temperature resistance, EM characteristics, and EM wave absorption of the composite materials were analyzed. The composite materials contained CFs, and the magnetic particles, such as Fe3O4, NiFe2O4, CoFe2O4, and Ni3Fe, distributed along the axial direction of the fiber, while boron nitride (BN) existed in the outermost coating layer. This preparation method improves the oxidation resistance and EM wave absorption performance of the CF. When the concentrations of the metal salt solution and the original BN solution are 0.625×1.5 mol L-1 [nFeCl3: nCoSO4: nNiSO4=2:2:1] and 4 mol L-1 [nH3BO3:nCONH22=1:3], respectively, the thermal decomposition temperature of the prepared CF/1.5FeCoNi/2BN is increased from 450°C to 754°C. In the frequency range of 10.6–26 GHz, the EM wave loss is less than −10 dB (the bandwidth spans 15.4 GHz). The CF-based composite material prepared in this study has the characteristics of light weight, wide absorption band, and strong oxidation resistance and constitutes the reference basis for the study of other high-temperature, EM wave-absorbing materials.

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Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Mao

Liang

et al. 2022

Physica Status Solidi (a)

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To cut the cost of microwave absorption materials (MAMs) and achieve the recycling of semicoke (SC), the by‐product in coal hydrogasification process, SC was applied to prepare composite MAMs. The facile synthesis process involves liquid‐phase impregnation, and then in situ carbothermal reduction treatment. Champion sample prepared under 800 °C (FeSC800) exhibits the minimum reflection loss (RLmin) of −39.3 dB under a coating thickness of 2.5 mm, and the effective absorption bandwidth (EAB) can reach 3.9 GHz (14.1–18 GHz) at a coating thickness of 1.5 mm. The enhancement of interfacial and dipole polarization, as well as the synergistic effect between the dielectric properties of SC matrix and the magnetic properties of Fe particles, can account for the excellent microwave absorption (MA) performance. In view of the source of SC matrix, the prepared FeSC800 was not only expected to become a candidate in the field of MAMs, but also presented a promising approach for the resource utilization of SC.

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Effect of absorbers' composition on the microwave absorbing performance of hollow Fe3O4 nanoparticles decorated CNTs/graphene/C composites

Cited by 89 publications

References 49 publications

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

Effects of Boron Nitride Coatings at High Temperatures and Electromagnetic Wave Absorption Properties of Carbon Fiber-Based Magnetic Materials

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

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