Construction of sandwich-like NiCo2O4/Graphite nanosheets/NiCo2O4 heterostructures for a tunable microwave absorber

Su, Xiaogang; Wang, Jun; Liu, Zijin; Dai, Wei; Chen, Wei; Zhang, Bin

doi:10.1016/j.ceramint.2020.04.269

Cited by 42 publications

(19 citation statements)

References 48 publications

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“…Graphene has a unique wave absorbing property due to the phenomena of electronic dipole polarization-relaxation and structural defective polarization-relaxation [24,25]. Graphite is one type of electrical loss absorbing agent with a large dielectric loss tangent value, which can absorb electromagnetic waves according to interface polarization attenuation or electronic polarization of the mediums [26,27]. Carbon fiber cloth has almost no wave-absorbing property, and thus the ability to absorb electromagnetic waves is weaker; while the two absorbing particles compound with carbon fibers respectively to form the layer interface.…”

Section: Absorbing Performancementioning

confidence: 99%

A Flexible Sandwich Structure Carbon Fiber Cloth with Resin Coating Composite Improves Electromagnetic Wave Absorption Performance at Low Frequency

Liu

Jing

et al. 2022

Polymers

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In order to improve the electromagnetic wave absorbing performance of carbon fiber cloth at low frequency and reduce the secondary pollution caused by the shielding mechanism, a flexible sandwich composite was designed by a physical mixing coating process. This was composed of a graphene layer that absorbed waves, a carbon fiber cloth layer that reflected waves, and a graphite layer that absorbed transmitted waves. The influence of the content of graphene was studied by a control variable method on the electromatic and mechanical properties. The structures of defect polarization relaxation and dipole polarization relaxation of graphene, the interfacial polarization and electron polarization of graphite, the conductive network formed in the carbon fiber cloth, and the interfacial polarization of each part, combined together to improve the impedance matching and wave multiple reflections of the material. The study found that the sample with 40% graphene had the most outstanding absorbing performance. The minimum reflection loss value was −18.62 dB, while the frequency was 2.15 GHz and the minimum reflection loss value compared to the sample with no graphene increased 76%. The composites can be mainly applied in the field of flexible electromagnetic protection, such as the preparation of stealth tent, protective covers of electronic boxes, helmet materials for high-speed train drivers, etc.

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Section: Absorbing Performancementioning

confidence: 99%

A Flexible Sandwich Structure Carbon Fiber Cloth with Resin Coating Composite Improves Electromagnetic Wave Absorption Performance at Low Frequency

Liu

Jing

et al. 2022

Polymers

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“…[ 65,66 ] To date, some carbon‐based materials with hollow, porous, sandwich‐like, core–shell, and 3D microstructures have been proved to have excellent microwave absorption properties as expected. [ 67–77 ] For example, Liu et al [ 77 ] prepared 3D porous RGO@Ni nanocomposite through a simple one‐pot method, and the minimum reflection loss and maximum effective absorption bandwidth could reach −61.2 dB and 6.6 GHz, respectively. Zhao et al [ 74 ] synthesized reduced graphene oxide decorated with carbon nanopolyhedrons (CNPs/RGO) composite by in situ pyrolysis, whose reflection loss could reach −66.2 dB at 6.2 GHz with a thickness of 2.89 mm.…”

Section: Carbon‐based Composite Microwave Absorption Materials and Me...mentioning

confidence: 99%

“…Zhao et al [ 74 ] synthesized reduced graphene oxide decorated with carbon nanopolyhedrons (CNPs/RGO) composite by in situ pyrolysis, whose reflection loss could reach −66.2 dB at 6.2 GHz with a thickness of 2.89 mm. Su et al [ 73 ] successfully fabricated NiCo 2 O 4 /Graphite nanosheets/NiCo 2 O 4 (GNC) hybrid composite with sandwich‐like structures with the maximum reflection loss of −47.01 dB and effective absorption bandwidth of 2.98 GHz (14.51–17.49 GHz) at a thickness of 1.0 mm ( Figure a,b,d). Meanwhile, core–shell structures can combine the dielectric material with the magnetic material and provide a significant way to form the multilevel heterogeneous interfaces for inducing polarization losses.…”

Section: Carbon‐based Composite Microwave Absorption Materials and Me...mentioning

confidence: 99%

Section: Carbon‐based Composite Microwave Absorption Materials and Me...mentioning

confidence: 99%

“…[65,66] To date, some carbonbased materials with hollow, porous, sandwich-like, core-shell, and 3D microstructures have been proved to have excellent microwave absorption properties as expected. [67][68][69][70][71][72][73][74][75][76][77] For example, Liu et al [77] prepared 3D porous RGO@Ni nanocomposite Classification according to the dimensionality of carbon materials. Reproduced with permission.…”

Section: Carbon-based Composite Microwave Absorption Materialsmentioning

confidence: 99%

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Research Progress of Metal Organic Frameworks/Carbon‐Based Composites for Microwave Absorption

et al. 2021

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Controllable Atomic Migration in Microstructures and Defects for Electromagnetic Wave Absorption Enhancement

Su,

Wang,

Liu

et al. 2024

Adv Funct Materials

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Defects and microstructures have been utilized to effectively modulate electromagnetic (EM) wave absorption for mitigating electromagnetic pollution and stealth issues. However, precisely feasibly tailoring them still remains challenging. Here, by using a multilevel hollow cobalt sulfide embedded in a heteroatomic sulfur (S) ‐doped carbon aerogel, a preferential reaction strategy of modulating point defects and hollow microstructures via controllable S atoms migration is proposed to improve the EM wave absorption. S atoms contribute to the creation of hollow structures via Kirkendall effects, as well as inducing point defects in the carbon lattice through doping. More significantly, the mechanisms prioritizing the formation of hollow structures over defects have been discovered, with low‐velocity atomic migration primarily modulating the microstructure for interfacial polarization and impedance matching, and high‐velocity atom migration focused on introducing defects to achieve polarization and conductive loss. The resulting aerogel exhibits an exceptionally maximum reflection loss of −52.82 dB and an effective absorption bandwidth of 8.82 GHz, which far exceeds most of the currently reported materials. Experimental and theoretical approaches, including microwave heating, Tesla interaction, first principles, and far‐field simulation, are comprehensively employed to verify its absorption effect and mechanism. Furthermore, the combination of excellent infrared stealth and self‐cleaning properties opens up its potential applications in complex environments.

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Construction of sandwich-like NiCo2O4/Graphite nanosheets/NiCo2O4 heterostructures for a tunable microwave absorber

Cited by 42 publications

References 48 publications

A Flexible Sandwich Structure Carbon Fiber Cloth with Resin Coating Composite Improves Electromagnetic Wave Absorption Performance at Low Frequency

A Flexible Sandwich Structure Carbon Fiber Cloth with Resin Coating Composite Improves Electromagnetic Wave Absorption Performance at Low Frequency

Research Progress of Metal Organic Frameworks/Carbon‐Based Composites for Microwave Absorption

Controllable Atomic Migration in Microstructures and Defects for Electromagnetic Wave Absorption Enhancement

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