Effect of Particle Size and MWCNTs Content on Microwave Absorption Characteristics of Cobalt

Jamwal, Udeshwari; Singh, Dharmendra; Yadav, K. L.

doi:10.1109/tmag.2022.3199582

Cited by 12 publications

(3 citation statements)

References 64 publications

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“…01-089-4053) except the characteristic peaks of the phase Fe and graphite carbon. Specifically, these characteristic peaks suggest that the type of the generated Fe particles also increased as the temperature rose [34]. Furthermore, the Raman spectra of all three samples showed the typical D peak band and G peak band of carbon materials (Figure 3b).…”

Section: Morphologies and Microstructuresmentioning

confidence: 85%

“…Therefore, in this work, we utilized a unique strategy to grow ZIF-8 coatings on Fe-doped ZnO surfaces using low-pressure vapor super-assembly [34]. After a series of controlled steps involving pyrolysis, template etching, and final annealing, the hierarchical Fe-N-C@CNTs composites with a remarkable microwave absorption ability were successfully prepared [19].…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical Carbon Network Composites Derived from ZIF-8 for High-Efficiency Microwave Absorption

et al. 2023

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Metal–organic framework (MOF)-derived composites have gained wide attention due to their specific structures and enhanced performance. In this work, we prepared carbon nanotubes with Fe nanoparticles connected to two-dimensional (2D) hierarchical carbon network composites via a low-pressure gas–solid reaction strategy. Specifically, the three-dimensional (3D) networks derived from ZIF-8 exploited the carbon nanotubes with the function of charge modulation. Meanwhile, we utilized the interconnected 2D nanostructures to optimize impedance matching and facilitate multiple scattering, ultimately improving the overall microwave absorption performance. Furthermore, based on the well-designed structures, the composites prepared at 800 °C (Fe-N-C@CNTs-800) achieved the best reflection loss (RL) of −58.5 dB, thereby obtaining superior microwave absorption performance. Overall, this study provides a good groundwork for further investigation into the modification and dimension design of novel hierarchical microwave absorbers.

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Section: Morphologies and Microstructuresmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Hierarchical Carbon Network Composites Derived from ZIF-8 for High-Efficiency Microwave Absorption

et al. 2023

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“…The rapid development of electronic devices has brought about a serious environmental pollution problem that cannot be ignored, , and the development of efficient microwave absorption materials (MAMs) has raised great attention . Typically, the ideal MAMs require strong reflection loss (RL), thin matching thickness, wide effective absorption bandwidth (EAB), and lightweight. , As we all know, MAMs with magnetic and dielectric components can effectively optimize impedance matching. , Therefore, in recent years, such materials have become extremely popular in the microwave absorption (MA) field.…”

Section: Introductionmentioning

confidence: 99%

Co Nanoparticles Embedded in N-Doped Carbon Nanotubes for Broadband Microwave Absorption

Xu,

Liao,

Zhu

et al. 2024

ACS Appl. Nano Mater.

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Herein, an efficient one-dimensional (1D) N-doped Co/C nanotube absorber was designed by a cobalt source and solvent ratio comodulation strategy. First, we explored the influences of different cobalt sources (CoCl 2 , Co(OAc) 2 , Co-(NO 3 ) 2 , and CoSO 4 ) on the morphology and microwave absorption (MA) property, which showed that CoCl 2 facilitated the formation of nanotubes with a relatively uniform diameter and length. Notably, the Co/C nanotubes displayed an ultrawide effective absorption bandwidth (EAB) of 6.885 GHz at 2.2 mm when the filling ratio was only 8 wt %. Then, by adjusting the solvent ratio of isopropanol (IPA) and water, Co/C showed a strong absorption of −44.51 dB with an EAB of 5.44 GHz at 2.35 mm. The outstanding MA performance is ascribed to the synergistic effect of dielectric and magnetic components, which is conducive to optimizing the impedance matching, thus broadening the EAB. In addition, the 1D nanostructure is good for constructing three-dimensional (3D) conductive networks and enhancing conductive loss. Since Co nanoparticles are wrapped in carbon nanotubes (CNTs), the confinement effect can effectively prevent the agglomeration of ferromagnetic nanoparticles, adjusting the MA performance. It is worth mentioning that the maximum Radar cross section (RCS) value of Co/C can be reduced by 28.8 dB m 2 . Furthermore, the RCS values are all lower than −10 dB m 2 from −90 to 90°and the minimum RCS value can reach −46.8 dB m 2 . This work provides a strategy for designing lightweight MA absorbers with strong RL and ultrawide EAB.

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An experiment to observe the effect of gamma radiation on microwave absorption properties of Li-substituted nickel ferrite

Jamwal

Singh

Yadav

2023

J Mater Sci: Mater Electron

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Effect of Particle Size and MWCNTs Content on Microwave Absorption Characteristics of Cobalt

Cited by 12 publications

References 64 publications

Hierarchical Carbon Network Composites Derived from ZIF-8 for High-Efficiency Microwave Absorption

Hierarchical Carbon Network Composites Derived from ZIF-8 for High-Efficiency Microwave Absorption

Co Nanoparticles Embedded in N-Doped Carbon Nanotubes for Broadband Microwave Absorption

An experiment to observe the effect of gamma radiation on microwave absorption properties of Li-substituted nickel ferrite

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