Issue 113, 2015

The electromagnetic interference shielding effectiveness of high aspect-ratio SiC nanofibers/epoxy composites

Abstract

This paper presents the measured electromagnetic interference (EMI) shielding effectiveness of silicon carbide nanofibers (SiCNFs)/epoxy composites and the associated shielding mechanism. After obtaining silicon carbide nano-fibers, with an aspect ratio up to 300, SiCNFs/epoxy composites were prepared using an effective dispersion method. The relative complex permittivity, permeability, and EMI shielding effectiveness (SE) of the composites were measured in the frequency range of 26.5–40.0 GHz. The addition of SiCNFs was found to improve the EMI SE at a low threshold value of 10 wt% concentration. At this concentration, the EMI SE was larger than 10 dB over the entire range of 26.5–40.0 GHz, and had a maximum value of 22.9 dB at 40.0 GHz, corresponding to a more than 99% reduction of EMI radiation. The increased polarization interface/boundary and the formed effective conductive network were believed to be responsible for the enhancement of EMI SE, due to the addition of high aspect ratio SiCNFs. Shielding mechanism was studied by resolving the total SE into absorption and reflection portions. Absorption was found to be the major shielding mechanism and reflection had a secondary shielding effect for the threshold SiCNFs concentration case.

Graphical abstract: The electromagnetic interference shielding effectiveness of high aspect-ratio SiC nanofibers/epoxy composites

Article information

Article type
Paper
Submitted
10 Aug 2015
Accepted
08 Oct 2015
First published
08 Oct 2015

RSC Adv., 2015,5, 93499-93506

The electromagnetic interference shielding effectiveness of high aspect-ratio SiC nanofibers/epoxy composites

Y. Zhang, Z. Wang, B. Zhang, G. Zhao and S. M. Guo, RSC Adv., 2015, 5, 93499 DOI: 10.1039/C5RA16007C

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