Electromagnetic wave absorption properties of carbon-encapsulated Co–Cu alloy nanoparticles prepared by gas explosion

Zhao, Tiejun; Liu, Yi; Wan, Haitao; Li, Zhihui; Wu, Yongxiang; Yan, Honghao

doi:10.1016/j.matchemphys.2023.128486

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…The imaginary parts of complex permittivity (ε ′′ ) and permeability (µ ′′ ) represent the corresponding loss capacity [17]. The microwave absorption property of samples is primarily related to their complex permittivity (ε r = ε r ′ − jε r ′′ ) and complex permeability (µ r = µ r ′ − jµ r ′′ ) [46]. As shown in Figure 6a, the ε ′ values of CoNi/C, CoNi/rGO-1, and CoNi/rGO-2 decrease from 12.8 to 10.4, 6.5 to 4.5, and 7.2 to 4.7, respectively, indicating that the ε ′ values show a decreasing trend with the increase of the frequency due to the dispersion behavior induced by the polarization lag [47].…”

Section: Absorbers Matching Eab (Ghz) Rl Min (Db) Referencesmentioning

confidence: 99%

Interface Modulation of CoNi Alloy Decorated with Few-Layer Reduced Graphene Oxide for High-Efficiency Microwave Absorption

Xie,

Li,

Zhang

et al. 2024

Coatings

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Metal-organic frameworks (MOFs)-derived microwave absorbers with tunable components and microstructures show great potential in microwave absorption. Herein, we report a facile thermal reduction approach for synthesizing CoNi alloy/reduced graphene oxide (CoNi/rGO) composites from bimetallic CoNi-MOFs. By tuning the ratio of graphene oxide (GO) in the precursors, the resulting CoNi/rGO-2 composite demonstrates optimal microwave absorption performance with a minimum reflection loss (RLmin) of −66.2 dB at 7.6 GHz in the C band. Moreover, the CoNi/rGO-2 with 50 wt% filler loading achieves a maximum effective absorption bandwidth (EAB) of 6.8 GHz (10.6–17.4 GHz) at a thickness of 2.5 mm, almost spanning the entire Ku band and a portion of the X band. The outstanding performance of CoNi/rGO-2 is ascribed to the high magnetic loss from the CoNi alloy and the incorporation of rGO, which induces interfacial polarization to enhance the dielectric loss and improve the impedance matching of composite. These favorable findings highlight the considerable potential and superiority of the CoNi/rGO-2 composite as an electromagnetic wave absorption material. This work sets forth a viable strategy for designing high-efficiency alloy/rGO absorbers.

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Section: Absorbers Matching Eab (Ghz) Rl Min (Db) Referencesmentioning

confidence: 99%

Interface Modulation of CoNi Alloy Decorated with Few-Layer Reduced Graphene Oxide for High-Efficiency Microwave Absorption

Xie,

Li,

Zhang

et al. 2024

Coatings

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“…The two factors that determine microwave absorption performance are impedance matching and attenuation characteristics. According to the transmission-line theory, the reflection loss (RL) values of absorbers can be described as follows [6]:…”

Section: Microwave Reflective Propertiesmentioning

confidence: 99%

“…Rivas et al [5] designed graphite-coated iron nanoparticles by CVD. Zhao et al [6] prepared carbon-encapsulated magnetic nanoparticles using the gas explosion method. Efficient absorption performance can be attained by minimizing electromagnetic wave reflection through proper impedance matching.…”

Section: Introductionmentioning

confidence: 99%

Microwave reflective properties of core-shell FeN_X@C/Fe₄N composite

Li,

Zheng,

Wang

2024

J. Phys.: Conf. Ser.

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To improve the electromagnetic properties of iron nitride, the core-shell FeNX@C/Fe4N composite material was designed by microwave plasma technique. Within the frequency range of 2-18 GHz, the microwave reflective characteristics of the novel composites mixed with 50% wax were examined. The composition of the core-shell FeNX@C was analyzed by XRD, Raman, and TEM, and the complex permeability and complex permittivity with frequency change were discussed. The results show that the RLmin value (RLmin=-55.1 dB) of FeNx@C/Fe4N composite appears at 17.8 GHz with a thickness of 1.5 mm, and the RLmin value reaches -42.1 dB at the thickness of 3.5 mm corresponding to 6.6 GHz. This work demonstrates the potential prospects for the application of microwave absorbers in the range of 2-18 GHz.

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Controllable fabrication of CoNi bimetallic alloy for high-performance electromagnetic wave absorption

Xie,

Li,

Yang

et al. 2024

RSC Adv.

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Electromagnetic wave absorption properties of carbon-encapsulated Co–Cu alloy nanoparticles prepared by gas explosion

Cited by 4 publications

References 38 publications

Interface Modulation of CoNi Alloy Decorated with Few-Layer Reduced Graphene Oxide for High-Efficiency Microwave Absorption

Interface Modulation of CoNi Alloy Decorated with Few-Layer Reduced Graphene Oxide for High-Efficiency Microwave Absorption

Microwave reflective properties of core-shell FeN_X@C/Fe₄N composite

Controllable fabrication of CoNi bimetallic alloy for high-performance electromagnetic wave absorption

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Electromagnetic wave absorption properties of carbon-encapsulated Co–Cu alloy nanoparticles prepared by gas explosion

Cited by 4 publications

References 38 publications

Interface Modulation of CoNi Alloy Decorated with Few-Layer Reduced Graphene Oxide for High-Efficiency Microwave Absorption

Interface Modulation of CoNi Alloy Decorated with Few-Layer Reduced Graphene Oxide for High-Efficiency Microwave Absorption

Microwave reflective properties of core-shell FeNX@C/Fe4N composite

Controllable fabrication of CoNi bimetallic alloy for high-performance electromagnetic wave absorption

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Microwave reflective properties of core-shell FeN_X@C/Fe₄N composite