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Proceedings Paper

EMI shielding performance study of tri-layer nano stealth composites
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Paper Abstract

In this paper, a method for preparing tri-layer nano stealth composite film is proposed. Using H2SO4, HNO3 mixture for MWCNTs carboxylation, dispersant CTAB is added into surface-treated CNTs, nano Fe and nano Fe3O4 respectively. These three mixtures are dispersed by ultrasonic vibration so that they form homogeneous films in epoxy matrix. Vector network analyzer is utilized for EMI SE measurements. According to experiment data, EMI shielding performance curves are generated when CNTs vary from 5%-10%wt, nano Fe 10%-15%wt, nano Fe3O4 10%-15%wt respectively in the frequency bands of 3.22-40GHz. Simultaneously, variation trends of these curves are analyzed. A new type of multilayer nano stealth composite film is fabricated by superposing the three films prepared above. The tri-layer nanocomposites of which matching layer of is 15%wt nano Fe3O4 or 15%wt nano Fe, absorbing layer is 5%wt CNTs and reflecting layer is 10%wt CNTs has good EMI shielding performance. The peak values of the two layered material all achieve more than -100dB.

Paper Details

Date Published: 30 March 2010
PDF: 7 pages
Proc. SPIE 7644, Behavior and Mechanics of Multifunctional Materials and Composites 2010, 764423 (30 March 2010); doi: 10.1117/12.847508
Show Author Affiliations
Di Song, Harbin Institute of Technology (China)
Yanju Liu, Harbin Institute of Technology (China)
Jinsong Leng, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 7644:
Behavior and Mechanics of Multifunctional Materials and Composites 2010
Zoubeida Ounaies; Jiangyu Li, Editor(s)

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