Ms. Di Song Profile

Di Song

at Harbin Institute of Technology

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Proceedings Article | 31 March 2010 Paper

EMI shielding performance study of tri-layer nano stealth composites

Di Song, Yanju Liu, Jinsong Leng

Proceedings Volume 7644, 764423 (2010) https://doi.org/10.1117/12.847508

KEYWORDS: Electromagnetic coupling, Iron, Nanocomposites, Composites, Epoxies, Coating, Network security, Ultrasonics, Waveguides, Mechanics

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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.

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