Enhanced electromagnetic wave absorption of nanoporous Fe3O4 @ carbon composites derived from metal-organic frameworks

Xiang, Zhen; Song, Yiming; Xiong, Juan; Pan, Zhongbin; Wang, Xiao; Liu, Lei; Li, Rui; Yang, Huawei; Lü, Wei

doi:10.1016/j.carbon.2018.10.014

Cited by 357 publications

(100 citation statements)

References 86 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: 68%

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: 68%

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

et al. 2019

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“…With this in mind, we prepared two sets of carbon‐containing composites with same chemical composition and micro‐structure ( Scheme ), but with different morphology (octahedral and rod shape), by pyrolyzing a pair of supramolecular isomers of MIL‐101‐Fe and MIL‐88B‐Fe . Metal–organic frameworks (MOFs) have emerged as promising pyrolysis precursors for fabricating metal/carbon or metal oxide/carbon composites as microwave absorbers, based on their well distribution of metal/metal oxide in resultant carbon network, relatively low density and inheritance of particle morphology after pyrolysis.…”

Section: Methodsmentioning

confidence: 99%

Tunable Electromagnetic Wave Absorption of Supramolecular Isomer‐Derived Nanocomposites with Different Morphology

Miao

Zhou

Chen

et al. 2020

Adv Materials Inter

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Design and fabrication of highly efficient electromagnetic wave absorbing materials are yet challenging tasks, mainly caused by the lack of the in‐depth understanding of structure–property relationship. Herein, significant morphology effect on electromagnetic wave absorption is uncovered by pyrolyzing two isomeric metal–organic frameworks (MOFs: MIL‐101‐Fe and MIL‐88B‐Fe). The resultant pyrolyzed nanocomposites from these two MOFs with different topology under same pyrolysis condition have almost identical chemical composition (i.e., element type, element content, and valence state) and microstructure (i.e., particle size, pore size, and volume). As far as it is known, this work represents the first study on morphology control for superior electromagnetic wave absorption in carbon‐included composite system. Notably, an excellent performance of minimum reflection loss of −59.2 dB with a thickness of 4.32 mm and effective absorption bandwidth of 6.5 GHz with a thickness of 2 mm are achieved by Fe/C‐700@101 (700 represent the pyrolysis temperature; 101 stands for MIL‐101 precursor) and Fe/Fe3C/C‐800@101, respectively. This contribution will shed the light on design of advanced electromagnetic wave absorbers in future, especially from the perspective of fine morphology control.

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“…Therefore, the new generation absorbing materials should have the characteristics of small thickness, light weight, wide absorption frequency range and strong electromagnetic wave absorption characteristics (Liu et al, 2012;Wu et al, 2016). In recent years, many nanomaterials have been proved to exhibit excellent absorbing properties, such as Fe 3 O 4 (Jia et al, 2010), SiC (Kuang et al, 2019), RGO aerogels (Zhang M. et al, 2019), C@CoFeO@MnO 2 (Feng et al, 2020), Fe 3 O 4 @NPC (Xiang et al, 2019), and PbS (Pan et al, 2017). In addition, many studies have shown that most of the nanocomposites have synergistic effects, which will be very beneficial to the absorbing properties of the materials (Liu et al, 2017;Jian et al, 2018;Ma et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Microwave Absorption Properties of NixSy/PVDF Nanocomposites

Gao

et al. 2020

Front. Mater.

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Octahedral Ni x S y nanoparticles and Ni x S y /PVDF nanocomposites are successfully prepared by solvothermal method. The electromagnetic absorption performance of Ni x S y /PVDF with different filler content is investigated in the range of 2-18 GHz. An optimal reflection loss value of −32.75 dB at 10.48 GHz is achieved for the filler content of 20 wt%, and the bandwidth <−10 dB can reach up to 4.48 GHz with a thickness of 3 mm. Furthermore, fundamental mechanisms of electromagnetic absorbing is discussed, indicating that the interface polarization, electric dipole polarization, Debye relaxation and impedance matching are the main factors affecting the absorption performance of Ni x S y /PVDF composites.

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Enhanced electromagnetic wave absorption of nanoporous Fe3O4 @ carbon composites derived from metal-organic frameworks

Cited by 357 publications

References 86 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

Tunable Electromagnetic Wave Absorption of Supramolecular Isomer‐Derived Nanocomposites with Different Morphology

Preparation and Microwave Absorption Properties of NixSy/PVDF Nanocomposites

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