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EMI Shielding of Carbon Nanoparticles/Polymer Composites at Terahertz Frequency Region.
Eman Omar Taha * 1 , Asmaa El-Deeb 2 , Usama Kandil 3 , Mahmoud Reda Taha 4
1  PhD, Researcher at Egyptian Petroleum Research Institute (EPRI), Egypt
2  PhD, Researcher at Housing and Building National Research Center, Egypt
3  Professor at Egyptian Petroleum Research Institute (EPRI), Egypt
4  Professor and Chair, Department of Civil, Construction and Environmental Engineering, University of New Mexico, Albuquerque, USA

Published: 30 August 2018 by MDPI in 1st International Online Conference on Nanomaterials session Materials

Significant progress has taken place in the past few years in developing terahertz devices to make use of their superior capabilities in radio astronomy, security screening, chemical analysis, medical imaging, biological sensing, etc. With such advance in terahertz devices, electromagnetic interference shielding (EMI) in the terahertz frequency region is becoming significantly important. In this work, we examine the time-domain spectroscopy, THz-TDS, performance of carbon nanoparticles/epoxy nanocomposites. Two types of carbon nanoparticles (carbon nanofibers and multi-walled carbon nanotubes) with different carbon contents (0.5, 1.0, 2.0, 2.5 wt. %) were used to fabricate epoxy nanocomposites using both sonication and mechanical stirring processes and were experimentally investigated in terahertz (0.1-1.0 THz) frequency range. Shielding efficiency, together with the dielectric properties of both types of carbon-epoxy nanocomposites were studied and compared with that of neat epoxy as a reference. We demonstrate the potential use of carbon nanofibers and multi-walled carbon nanotubes for THz-EMI applications and show that the variation of carbon contents in epoxy matrix can greatly affect EMI shielding efficiency.

Keywords: Terahertz, electromagnetic interference shielding, polymer nanocomposites.
Comments on this paper
Ana Maria Diez Pascual
Comments on the paper
Excellent work! I am really impressed! Did you try higher CNT contents?
What about single walled carbon nanotubes? These are supposed to provide better properties, although are more expensive

Eman Taha
Reply to Dr. Ana Maria Diez Pascual
Thank you for your comment and appreciate the suggestion. Our present experimental program investigated the EM shielding of composites incorporating higher CNTs up to 4.0 % and will be published as soon as possible.
Our future work is to examine the EM shielding of composites incorporating other carbonaceous nanoparticles such as single walled carbon nanotubes and graphene.

Dorothy Brendon
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Anna Shetty
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