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Enhanced Microwave Absorption Performance of SWCNT/SiC Composites

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Abstract

The present work emphasizes the microwave absorption performance of single-walled carbon nanotube (SWCNT)/SiC composites prepared by mechanically mixing the components, i.e., SWCNT and SiC in desired weight fractions using a cost-effective and simple ball-milling route. The microwave absorption results reveal that the integration of SiC with a small weight fraction of SWCNT exhibited an improved absorption performance in the Ku band compared to pristine SiC. The SWCNT/SiC composite with 2.5 wt.% SWCNT exhibited a superior microwave absorption behavior with a minimum reflection loss of − 37.11 dB and < − 10 dB absorption bandwidth of 4.38 GHz for the absorber thickness of 2 mm. The microwave absorption efficiency of SWCNT/SiC composites was also measured corresponding to − 10 dB, which is equivalent to 90% microwave absorption when evaluating the absorption performance. A maximum microwave absorption efficiency of 18.95 dB GHz/mm was observed for the composite with 2.5 wt.% SWCNT dispersion compared to 3.4 dB GHz/mm for pristine SiC. Enhanced microwave absorption characteristics for SWCNT/SiC composites may be attributed to various absorption mechanisms, such as dipole polarization, multiple scatterings, multiple reflections, conductive loss, interfacial polarization, and defect-induced dipole polarization. The microwave absorption results of SWCNT/SiC composites indicate that they may serve as encouraging thin thickness candidates with superior microwave absorption for application in the Ku band.

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Acknowledgments

The author, Samarjit Singh, expresses his earnest gratitude to the Ministry of Human Resources and Development (MHRD), India, for the fellowship. The authors also appreciate various research centers, such as CIR-MNNIT Allahabad, ACMS-IIT Kanpur, and Department of Electronics and Computer Science-IIT Roorkee, for the phase, morphology, and dielectric characterization of the samples.

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Authors and Affiliations

  1. Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, India

    Samarjit Singh & Abhishek Kumar

  2. Department of Electronics and Computer Engineering, Indian Institute of Technology Roorkee, Roorkee, India

    Dharmendra Singh

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  1. Samarjit Singh
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  2. Abhishek Kumar
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  3. Dharmendra Singh
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Correspondence to Abhishek Kumar.

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Singh, S., Kumar, A. & Singh, D. Enhanced Microwave Absorption Performance of SWCNT/SiC Composites. J. Electron. Mater. 49, 7279–7291 (2020). https://doi.org/10.1007/s11664-020-08460-9

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  • DOI: https://doi.org/10.1007/s11664-020-08460-9

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