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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