Enhanced Microwave Absorption Performance of  SWCNT/SiC Composites

Singh, Samarjit; Kumar, Abhishek; Singh, Dharmendra

doi:10.1007/s11664-020-08460-9

Cited by 20 publications

(4 citation statements)

References 43 publications

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“…Compared with the sample with 40 wt.% and 60 wt.% ZnO/C absorbent content, the ZnO/C-filled paraffin composite sample filled with 50 wt.% absorbent content presents the favorable reflection loss of −25.64 dB and optimal effective absorption bandwidth of 2.21 GHz. Table 2 exhibits the microwave absorption properties of ZnO/C composite absorbent and some other reported composites filled with ZnO or C absorbents [32][33][34][35][36][37][38][39][40]. In contrast, the investigated ZnO/C composite absorbent in this work presents favorable microwave absorption properties.…”

Section: Microwave Absorption Propertiesmentioning

confidence: 84%

Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents

Yan

Jia

Zhou

et al. 2023

Metals

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Modern electronic information technology has led social life into inevitable electromagnetic pollution, making microwave absorbing materials more and more important. Herein, dielectric-conductive ZnO/C hybrid composite absorbents were prepared by two-step carbonization with ZnO powders and glucose as critical materials. The electrical conductivity, complex permittivity, and reflection loss were analyzed to study the dielectric and microwave absorption properties. Results show that the prepared ZnO/C composite absorbents exist in the form of rod-like ZnO dispersed in the irregular block carbon, and the complex permittivity of the composite absorbents can be adjusted via varying the carbonization temperature. The minimum reflection loss of −25.64 dB is achieved at 1.8 mm thickness for the composite absorbent with 50 wt.% absorbent content as the final carbonization temperature is 750 °C, and the optimum effective absorption bandwidth is 2.21 GHz at 9.64–11.85 GHz. The excellent microwave absorption properties of ZnO/C composite absorbents are attributed to the combination actions of dipole polarization, conductance loss, and interface polarization, which is significant for the purposeful design of superior microwave-absorbing materials with dielectric and conductive absorbents.

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Section: Microwave Absorption Propertiesmentioning

confidence: 84%

Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents

Yan

Jia

Zhou

et al. 2023

Metals

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“…The electronic polarization and ionic polarization usually occur outside the microwave band. 67 The porous structure of carbon can act as a polarization centre, generating dipole polarization and providing relaxation loss. 68 Moreover, ferromagnetic particles combined on the surface can provide more interfaces and produce interfacial polarization.…”

Section: Resultsmentioning

confidence: 99%

Fe@Fe₃C Core-Shell Nanoparticles Embedded in Polyvinyl Alcohol-Derived Porous Carbon toward Light and High-Performance Microwave Absorption

Liu¹,

Zhang²,

Zhao³

et al. 2022

ECS J. Solid State Sci. Technol.

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High-performance microwave absorbents play a key role in the information technology field. Here, excellent microwave absorption properties were achieved via embedded Fe@Fe3C core-shell nanoparticles in polyvinyl alcohol-derived porous carbon matrix. The results indicate that the microwave absorption performance will be greatly enhanced due to the interface between the nanoparticles and matrix, as well as the core-shell and the porous structure, with an increase in energy consumption capacity via dipole polarization, interface loss, and multiple reflection/scattering. The maximum reflection loss (RLmax) reaches -56.88 dB at 11.3 GHz with the thickness of 2.11 mm, and the effective absorption bandwidth (EAB, RL<-10 dB) can get up to 5.2 GHz (from 12.9 to 18 GHz) with the thickness of 1.64 mm. Moreover, due to the low density of the porous carbon matrix, the total weight of the absorbents can be greatly reduced, which provides an efficient method for lightweight and high-performance microwave absorption materials design.

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“…Both SiC powder and carbon powder (e.g., CB, CNTs, graphite) are commercially available raw materials, and thus the simplest and the most direct method for the preparation of SiC/C composites is physical mixing. 111 , 112 , 113 , 114 For example, Liu et al. mixed commercial SiC and CB through ball milling, and investigated the change of EM properties dependent on their filler loadings in epoxide resin.…”

Section: Sic/c Compositesmentioning

confidence: 99%

State-of-the-art in carbides/carbon composites for electromagnetic wave absorption

Hu,

Gai,

Liu

et al. 2023

iScience

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Enhanced Microwave Absorption Performance of SWCNT/SiC Composites

Cited by 20 publications

References 43 publications

Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents

Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents

Fe@Fe₃C Core-Shell Nanoparticles Embedded in Polyvinyl Alcohol-Derived Porous Carbon toward Light and High-Performance Microwave Absorption

State-of-the-art in carbides/carbon composites for electromagnetic wave absorption

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Enhanced Microwave Absorption Performance of SWCNT/SiC Composites

Cited by 20 publications

References 43 publications

Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents

Tunable Complex Permittivity and Strong Microwave Absorption Properties of Novel Dielectric-Conductive ZnO/C Hybrid Composite Absorbents

Fe@Fe3C Core-Shell Nanoparticles Embedded in Polyvinyl Alcohol-Derived Porous Carbon toward Light and High-Performance Microwave Absorption

State-of-the-art in carbides/carbon composites for electromagnetic wave absorption

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About

Fe@Fe₃C Core-Shell Nanoparticles Embedded in Polyvinyl Alcohol-Derived Porous Carbon toward Light and High-Performance Microwave Absorption