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Carbon nanotube composites for broadband microwave absorbing materials

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10 Author(s)
Saib, A. ; CISSOID S.A., Louvain-la-Neuve ; Bednarz, L. ; Daussin, R. ; Bailly, C.
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In this paper, we present a new shielding and absorbing composite based on carbon nanotubes (CNTs) dispersed inside a polymer dielectric material. The extremely high aspect ratio of CNTs and their remarkable conductive properties lead to good absorbing properties with very low concentrations. A broadband characterization technique is used to measure the microwave electrical properties of CNT composites. It is shown that a conduction level of 1 S/m is reached for only 0.35 wt % of a CNT, while, for a classical absorbing composite based on carbon black, 20% concentration is mandatory. The conductive properties are explained by a phenomenological electrical model and successfully correlated with rheological data aiming at monitoring the dispersion of conductive inclusions in polymer matrices

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 6 )

Date of Publication:

June 2006

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