Self-assembly of ternary hollow microspheres with strong wideband microwave absorption and controllable microwave absorption properties

Zeng, Qiang; Chen, Ping; Qi, Yu; Chu, Hairong; Xiong, Xuhai; Xu, Dongwei; Wang, Qi

doi:10.1038/s41598-017-08293-3

Cited by 32 publications

(6 citation statements)

References 43 publications

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“… 1–4 The various kinds of absorbers are normally classified into two categories: dielectric materials and magnetic materials, which have been successfully synthesized to ease electromagnetic (EM) wave pollution by means of absorbing unwanted electromagnetic signals. 2,5–7 An ideal EM wave absorption material is generally required to possess these features: strong absorption, wide absorption band, low thickness, lightweight, good thermal stability, and antioxidant properties. 8–11 …”

Section: Introductionmentioning

confidence: 99%

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Economical synthesis of composites of FeNi alloy nanoparticles evenly dispersed in two-dimensional reduced graphene oxide as thin and effective electromagnetic wave absorbers

Zhang

et al. 2018

RSC Adv.

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a Developing electromagnetic wave absorbing materials prepared by a facile and economical way is a great challenge. Herein, we report a feasible route to synthesize a series of two-dimensional FeNi/rGO composites by a hydrothermal method followed by a carbonization process. The characterization confirms that nano-sized FeNi alloy nanoparticles are evenly supported onto graphene sheets without aggregation. The homogeneous dispersion of the nanoparticles may result from the introduction of glucose and the oxygen-containing groups on the surface of the graphene oxide. Measurements show that the microwave attenuation capability of the composites can be improved dramatically by adjusting the proportion of dielectric and magnetic components. Consequently, the two-dimensional magnetic material (FeNi/rGO-100) exhibits an excellent microwave absorption performance. In detail, the minimum reflection loss of À42.6 dB and effective bandwidth of 4.0 GHz can be reached with a thinner thickness of 1.5 mm. This study demonstrates that synergistic effects among the magnetic particles, reduced graphene oxide and amorphous carbon layers give rise to the highlighted microwave attenuation ability. Overall, the FeNi/rGO composite is a promising candidate to be used as a microwave absorber, and the feasible and economical method has shown potential application to construct multitudinous two-dimensional materials.

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Section: Introductionmentioning

confidence: 99%

“…The minimum reflection loss value reached −68.1 dB at 13.8 GHz with a thickness of 2.2 mm. 2 Moitra et al prepared BiFeO 3 -rGO nanocomposites and exhibited minimum reflection loss value of 28.68 dB at 10.68 GHz. 5 …”

Section: Introductionmentioning

confidence: 99%

Economical synthesis of composites of FeNi alloy nanoparticles evenly dispersed in two-dimensional reduced graphene oxide as thin and effective electromagnetic wave absorbers

Zhang

et al. 2018

RSC Adv.

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“…The ε ″ values of the unaged sample and the samples aged at 200 °C (in Fig. 6 d) show dramatic fluctuations, and several resonant peaks appear in the frequency range because more voids and defects exist in the composites at lower temperatures, resulting in the accumulation of charges and further enhancement of interface polarization, dipole polarization and related relaxation 36 , 37 .…”

Section: Resultsmentioning

confidence: 99%

The microwave-absorption properties and mechanism of phenyl silicone rubber/CIPs/graphene composites after thermal-aging in an elevated temperature

Yan

Guo

Jiang

2022

Sci Rep

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Recently, the application and development of flexible microwave-absorption composites based on silicone rubber have gradually become a research hot spot. In this study, methyl vinyl phenyl silicone rubber (MPVQ)/carbonyl iron particles (CIPs)/graphene (GR) composites were prepared by mechanical blending, and the effects of thermal-ageing temperature on the microwave-absorption properties of the composites were investigated. The mechanism of the thermal-ageing temperature’s effects on microwave-absorption behaviour was identified. The results show that unaged composites have superior microwave-absorption properties, with a minimum reflection loss (RLmin) of − 87.73 dB, a lowest thickness of 1.46 mm, and an effective absorption bandwidth (EAB, RL < − 10 dB) reaching 5.8 GHz (9.9–15.7 GHz). With ageing at 240 °C for 24 h, the RLmin at a frequency of 5.48 GHz is − 45.55 dB with a thickness of 2.55 mm, and the EAB value reaches 2 GHz (range 4.6–6.6 GHz). In the thermal-ageing process, a crosslinking reaction occurs in MPVQ with an increase in crosslinking density from 5.88 × 10−5 mol g−1 (unaged) to 4.69 × 10−4 mol g−1 (aged at 240 °C). Simultaneously, thermal degradation of the composites leads to a reduction in the rubber concentration. In addition, a small amount of CIPs are oxidized to Fe3O4, and the remaining CIPs aggregate to generate more electrically conductive pathways. Consequently, the dielectric loss of the composites will be significantly improved, resulting in poor impedance matching. The microwave-absorption properties of the composites gradually decrease with increasing thermal-ageing temperature from 200 to 240 °C.

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“…Although a high dielectric loss tangent helps EMW absorption in a similar manner to the magnetic loss tangent, a high dielectric loss tangent usually leads to a high permittivity value and impedance mismatch. A composite membrane with high EMW absorption and low EMW reflection is a key material for EMW absorbers. , The electromagnetic wave absorbing performance was measured by calculating the reflection loss of FeCo nanochains, FeCo nanobelts, and FCBN at various thicknesses ( d ) and frequencies ( f ) via the following equations: where μ r = μ′ – j μ″ and ε r = ε′ – j ε″ are the relative permeability and permittivity, respectively, and c , Z 0 , and Z in are the speed of light in vacuum, wave impedance of free space, and wave impedance of the material, respectively. Here, ideal EMW absorbers are thin but have strong EMW absorption and broad absorption bandwidth, with the reflection loss of <−10 dB .…”

Section: Resultsmentioning

confidence: 99%

Electromagnetic Wave Absorbing, Thermal-Conductive Flexible Membrane with Shape-Modulated FeCo Nanobelts

Chang

Kwon

Jeong

et al. 2022

ACS Appl. Mater. Interfaces

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Electromagnetic wave (EMW)-absorbing materials, manufactured with composites of magnetic particles, are essential for maintaining a high complex permeability and modulated permittivity for impedance matching. However, commonly available EMW-absorbing materials are unsatisfactory owing to their low complex permeability in the high-frequency band. Herein, we report a thin, flexible EMW-absorbing membrane comprising shape-modulated FeCo nanobelts/boron nitride nanoparticles, which enables enhanced complex permeability in the S, C, and X bands (2–12 GHz). The boron nitride nanoparticles that are introduced to the FeCo nanobelts demonstrate control of the complex permittivity, leading to an effective impedance matching close to 1, consequently resulting in a high reflection loss value of −42.2 dB at 12.0 GHz with only 1.6 mm thickness. In addition, the incorporation of boron nitride nanoparticles improves the thermal conductivity for the heat dissipation of the absorbed electromagnetic wave energy. Overall, the comprehensive study of nanomaterial preparation and shape modulation technologies can lead to the fabrication of an excellent EMW-absorbing flexible composite membrane.

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Self-assembly of ternary hollow microspheres with strong wideband microwave absorption and controllable microwave absorption properties

Cited by 32 publications

References 43 publications

Economical synthesis of composites of FeNi alloy nanoparticles evenly dispersed in two-dimensional reduced graphene oxide as thin and effective electromagnetic wave absorbers

Economical synthesis of composites of FeNi alloy nanoparticles evenly dispersed in two-dimensional reduced graphene oxide as thin and effective electromagnetic wave absorbers

The microwave-absorption properties and mechanism of phenyl silicone rubber/CIPs/graphene composites after thermal-aging in an elevated temperature

Electromagnetic Wave Absorbing, Thermal-Conductive Flexible Membrane with Shape-Modulated FeCo Nanobelts

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