Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 1, Pages 147-157Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc05152j
Keywords
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Funding
- National Natural Science Foundation of China [51773138]
- Fundamental Research Funds for the Central Universities
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Lightweight and efficient electromagnetic interference (EMI) shielding composites are of great significance for the development of next generation communication technology, wearable equipment and high-power electronic equipment. However, it is still challenging to achieve the purpose of both high EMI shielding performance and a low reflection ratio. In this work, lightweight and flexible silicon rubber composite foams were fabricated through supercritical carbon dioxide (scCO(2)) foaming and layered structure construction. The magnetic ferriferrous oxide (Fe3O4)@multi-walled carbon nanotube (MWCNT) nanoparticles and the porous structure of the upper layer of silicon rubber/Fe3O4@MWCNT foam act as an effective absorbing layer, while dense silver particles with high conductivity on the surface of silver-coated non-woven fabric (Ag@NWF) show efficient electromagnetic (EM) wave reflection ability at the bottom. The EM waves undergo the process of absorption-reflection-reabsorption when they travel in the layered structure foam. The composite foam shows an EMI shielding effectiveness (SE) approaching 90 dB at a low filler content (2.08 vol% Fe3O4@MWCNTs and 0.81 vol% Ag) and density (0.38 g cm(-3)) in 8.2-12.4 GHz due to the selective distribution of silver nanoparticles on the surface of non-woven fabric and the introduction of a porous structure. The average reflection coefficient (R) is as low as 0.54, which indicates that only 54% of the EM waves are reflected back to the air. Moreover, the R value reaches a very low peak of 0.026 because of the destructive interference between the reflected and incident EM waves. This work provides a feasible idea for the preparation of lightweight, high efficiency and low reflection EMI shielding composites.
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