Synthesis of sandwich microstructured expanded graphite/barium ferrite connected with carbon nanotube composite and its electromagnetic wave absorbing properties

Zhao, Tingkai; Jin, Wenbo; Ji, Xianglin; Yan, Hongxia; Jiang, Yuting; Dong, Ying; Yang, Yao; Dang, Alei; Li, Hao; Li, Tiehu; Shang, Songmin; Zhou, Zhongfu

doi:10.1016/j.jallcom.2017.04.070

Cited by 67 publications

(33 citation statements)

References 54 publications

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“…Figure 10 summarizes the microwave absorption performance of the composites with multilayer structure in recent years. The sandwich structure combined with the FSS makes the proposed composite highly competitive with respect to other composites with pure multilayer structure, which cannot satisfy low thickness and wide bandwidth conditions simultaneously [ 6 , 9 , 38 , 39 , 40 , 41 ]. Introducing FSS into the sandwich structure can be an effective way to solve the above issue [ 10 , 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Chen

Zhou

et al. 2018

Materials

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A broadband microwave absorbing composite with a multi-scale layered structure is proposed, in which a reduced graphene oxide (RGO) film sandwiched between two layers of epoxy glass fiber laminates serves as the frequency selective surface (FSS). RGO films with the desired electrical properties were synthesized directly by hydrothermal reaction, vacuum filtration, and heat treatment without subsequent processing. With the novel layer-by-layer structure ranging from micro to macro scale, the optimized composite exhibits excellent microwave absorption performance with a total thickness of 3.2 mm. Its reflection coefficient (RC) is less than −10 dB in the entire X and Ku band, reaching a minimum value of −32 dB at 10.2 GHz and an average RC of −22.8 dB from 8 to 18 GHz. Enhanced microwave absorption of the composites is achieved through the optimization of layer thickness in the sandwich structure to promote destructive interference. Improved impedance matching by the introduction of FSS along with the polarization and conduction loss of layered graphene films also contribute to the increased absorption.

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Section: Resultsmentioning

confidence: 99%

Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Chen

Zhou

et al. 2018

Materials

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“…Electromagnetic wave absorbing (EMWA) materials with strong absorption, wide absorption bandwidth, thin thickness, light weight, and high thermal stability are widely used in military and civilian fields [1][2][3][4][5][6][7][8][9][10]. During the past decades, expanded graphite (EG) was widely researched in the area of EMWA considering its wider source, lower cost, larger surface area, high surface activity, rich pore structure, etc., which can be applied in lithium ion batteries [11], biomedicine [12], or electronic heat dissipation [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Microwave Absorption Properties of Sulfur-Free Expanded Graphite/Fe3O4 Composites

Sun

et al. 2020

Molecules

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In this study, sulfur-free expanded graphite (EG) was obtained by using flake graphite as the raw material, and EG/Fe3O4 composites with excellent microwave absorption properties were prepared by a facile one-pot co-precipitation method. The structure and properties of as-prepared EG/Fe3O4 were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Raman, X-ray photoelectron spectrometry (XPS), thermogravimetric (TG), and vibrating sample magnetometry (VSM) characterizations. The Fe3O4 intercalated between the layers of expanded graphite forms a sandwich-like structure which is superparamagnetic and porous. When applied as a microwave absorber, the reflection loss (RL) of EG/Fe3O4 reaches −40.39 dB with a thickness of 3.0 mm (10 wt% loading), and the effective absorption bandwidth (EAB < −10 dB) with RL exceeding −10 dB is 4.76–17.66 GHz with the absorber thickness of 1.5–4.0 mm. Considering its non-toxicity, easy operation, low cost, suitability for large-scale industrial production, and excellent microwave absorbing performance, EG/Fe3O4 is expected to be a promising candidate for industrialized electromagnetic absorbing materials.

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“…Recent extensive studies have focused on magnetic radar‐absorbing materials (RAMs) . Saville classified wave‐absorbing materials as graded interfaces‐impedance matching, resonant material, circuit analog RAM, magnetic RAM, and adaptive RAM (dynamically‐adaptive RAM) .…”

Section: Introductionmentioning

confidence: 99%

Computer simulation to investigate magnetic and wave‐absorbing characteristics of iron nanoparticles

Liu

Tai

et al. 2019

J Chinese Chemical Soc

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Computer simulations were carried out to investigate the magnetic and waveabsorbing characteristics of iron nanoparticles. The magnetic properties were found to depend on the shape, aggregation, and array of the nanoparticles. Nanoparticle systems were simulated using a molecular dynamics (MD) method, and the resulting configurations were used to compute the magnetic properties of the systems. In this work, microdot magnetic dipoles were assumed to localize on the iron atoms of nanoparticles. The dynamics of these magnetic dipoles under an external magnetic field were simulated by solving the Landau-Lifshitz-Gilbert equation numerically. The energy loss of a system under an external magnetic field was computed from the hysteresis curve and was correlated with the wave-absorbing characteristic of the system. The findings suggested that the disk-shaped iron particles had a greater hysteresis loss energy than the ball-shaped iron particles. It was also found that the aggregation of nanoparticles apparently reduced the waveabsorbing characteristic of the system. All the outcomes were in good agreement with the experimental measurements.

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Synthesis of sandwich microstructured expanded graphite/barium ferrite connected with carbon nanotube composite and its electromagnetic wave absorbing properties

Cited by 67 publications

References 54 publications

Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Synthesis and Microwave Absorption Properties of Sulfur-Free Expanded Graphite/Fe3O4 Composites

Computer simulation to investigate magnetic and wave‐absorbing characteristics of iron nanoparticles

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