Fabrication of core-shell Co@HCN@PANI composite material with enhanced electromagnetic wave absorption

Meng, Liang; Li, Junjie; Li, Xilin; Wang, Zhenjun; Zhou, Wen

doi:10.1016/j.jallcom.2023.171528

Cited by 7 publications

(3 citation statements)

References 42 publications

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“…106,109 In general, the change of the value of C o with frequency could estimate whether the magnetic loss of the material is caused by eddy loss or natural resonance loss. 110,111 If the curve of the value of C o fluctuates greatly with frequency, it indicates that the magnetic loss of the material is mainly caused by natural resonance loss. On the contrary, if the value of C o is almost a constant, the magnetic loss of the material is mainly caused by the eddy current loss.…”

Section: Magnetic Loss Compositesmentioning

confidence: 99%

“…In order to study the eddy loss mechanism, the following formula is used to calculate the eddy current loss coefficient C o : C normalo = 2 π μ normalo d 2 σ = μ ″ false( μ ′ false) 2 f where μ o is the vacuum permeability, d is the thickness of the absorber, σ is the conductivity, μ′ is the real part of the permeability, μ″ is the imaginary part of the permeability, and f is the frequency . The value of C o could be calculated by taking the real and imaginary values of the permeability obtained from the test into the above eq . , In general, the change of the value of C o with frequency could estimate whether the magnetic loss of the material is caused by eddy loss or natural resonance loss. , If the curve of the value of C o fluctuates greatly with frequency, it indicates that the magnetic loss of the material is mainly caused by natural resonance loss. On the contrary, if the value of C o is almost a constant, the magnetic loss of the material is mainly caused by the eddy current loss. , Shown in Figure are the C o values of the C3N1, C1N3, and C1N1 Co-2DSi (400 °C), Co-2DSiO 2 (850 °C), and Co-2DSiO 2 (950 °C) samples.…”

Section: Magnetic Loss Compositesmentioning

confidence: 99%

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MoS₂-Based Nanocomposites for Microwave Absorption: A Review

Li,

et al. 2024

ACS Appl. Nano Mater.

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Molybdenum disulfide (MoS2), as a two-dimensional material, has a potential application prospect in microwave absorption, electromagnetic shielding, energy storage, electrochemistry, and other fields due to its unique structure, excellent electrical conductivity, abundant surface area, and good mechanical strength. In this paper, the microwave absorbing properties of MoS2-based composites are reviewed objectively, and the recent research achievements and progress in dielectric loss type and magnetic loss type composites are summarized. Then, the microwave absorption mechanism of MoS2-based composites is systematically analyzed in terms of dielectric loss and magnetic loss. At the same time, the application of MoS2-based microwave absorbing materials in current social needs is summarized including military radar stealth and civil electronic communication. In addition, the challenges and bottlenecks in the future development of microwave absorber materials are also presented.

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Section: Magnetic Loss Compositesmentioning

confidence: 99%

Section: Magnetic Loss Compositesmentioning

confidence: 99%

MoS₂-Based Nanocomposites for Microwave Absorption: A Review

Li,

et al. 2024

ACS Appl. Nano Mater.

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“…[13]. Moreover, Co/metal oxide [14,15], Co/ceramics [16,17], and Co/polymer [18,19] have also emerged as promising candidates of highperformance EM wave absorbers.…”

Section: Introductionmentioning

confidence: 99%

Enhanced interfacial polarization through the conversion of Co@C into Co@Co_1−xS@C nanocapsules utilizing a facile sulfidation process

Zhou,

Javid,

Saleem

et al. 2024

Phys. Scr.

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The design and development of efficient Co-based electromagnetic (EM) absorbents with double-shell structures have received relatively less attention in the literature. The construction of multiple heterointerfaces gives rise to a unique morphology that holds significant potential in expanding the absorbing frequency range. Co@Co1-xS@C nanocapsules (NCs) with Co as the cores, Co1-xSx and C as the middle and outside shells separately, were successfully prepared using a facile two step process: synthesizing Co@C core-shell NCs by arc-discharge method and subsequently converting them into Co@Co1-xS@C NCs through chemical sulfidation reaction. The experimental results indicate that the thickness of the carbon shell exhibits a decreasing trend (from 1 ± 0.1 nm to 0.6 ± 0.02 nm) following the post-sulfidation process, lasting for approximately two hours. The defect density of the carbon shell also declines from 1.88 ×1011 cm-2 to 1.14 ×1011 cm-2. The reduction in thickness of the carbon shell and the formation of new Co1-xS not only enable efficient manipulation of impedance matching between the dielectric shells and magnetic cores but also facilitate the construction of multiple interfacial polarizations. The study provides evidence that the multi-interfacial Co@Co1-xS@C nanocomposite serves as an effective EM absorbent achieving a minimum reflection loss (RL) up to –78.6 dB at a thickness of merely 1.52 mm within the frequency range of 2~18 GHz.

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Cation Bimetallic MOF Anchored Carbon Fiber for Highly Efficient Microwave Absorption

Zhang,

Li,

Shi

et al. 2024

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Carbon fiber (CF) is a potential microwave absorption (MA) material due to the strong dielectric loss. Nevertheless, owing to the high conductivity, poor impedance matching of carbon‐based materials results in limited MA performance. How to solve this problem and achieve excellent MA performance remains a principal challenge. Herein, taking full advantage of CF and excellent impedance matching of bimetallic metal–organic frameworks (MOF) derivatives layer, an excellent microwave absorber based on micron‐scale 1D CF and NiCoMOF (CF@NiCoMOF‐800) is developed. After adjusting the oxygen vacancies of the bimetallic MOF, the resultant microwave absorber presented excellent MA properties including the minimum reflection loss (RLmin) of −80.63 dB and wide effective absorption bandwidth (EAB) of 8.01 GHz when its mass percent is only 5 wt.% and the thickness is 2.59 mm. Simultaneously, the mechanical properties of the epoxy resin (EP)‐based coating with this microwave absorber are effectively improved. The hardness (H), elastic modulus (E), bending strength, and compressive strength of CF@NiCoMOF‐800/EP coating are 334 MPa, 5.56 GPa, 82.2 MPa, and 135.8 MPa, which is 38%, 15%, 106% and 53% higher than EP coating. This work provides a promising solution for carbon materials achieving excellent MA properties and mechanical properties.

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Fabrication of core-shell Co@HCN@PANI composite material with enhanced electromagnetic wave absorption

Cited by 7 publications

References 42 publications

MoS₂-Based Nanocomposites for Microwave Absorption: A Review

MoS₂-Based Nanocomposites for Microwave Absorption: A Review

Enhanced interfacial polarization through the conversion of Co@C into Co@Co_1−xS@C nanocapsules utilizing a facile sulfidation process

Cation Bimetallic MOF Anchored Carbon Fiber for Highly Efficient Microwave Absorption

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Fabrication of core-shell Co@HCN@PANI composite material with enhanced electromagnetic wave absorption

Cited by 7 publications

References 42 publications

MoS2-Based Nanocomposites for Microwave Absorption: A Review

MoS2-Based Nanocomposites for Microwave Absorption: A Review

Enhanced interfacial polarization through the conversion of Co@C into Co@Co1−xS@C nanocapsules utilizing a facile sulfidation process

Cation Bimetallic MOF Anchored Carbon Fiber for Highly Efficient Microwave Absorption

Contact Info

Product

Resources

About

MoS₂-Based Nanocomposites for Microwave Absorption: A Review

MoS₂-Based Nanocomposites for Microwave Absorption: A Review

Enhanced interfacial polarization through the conversion of Co@C into Co@Co_1−xS@C nanocapsules utilizing a facile sulfidation process