Title :
Carbon nanotube composites for broadband microwave absorbing materials
Author :
Saib, Aimad ; Bednarz, Lukasz ; Daussin, Raphael ; Bailly, Christian ; Lou, Xudong ; Thomassin, Jean-Michel ; Pagnoulle, Christophe ; Detrembleur, Christophe ; Jérôme, Robert ; Huynen, Isabelle
Author_Institution :
CISSOID S.A., Louvain-la-Neuve
fDate :
6/1/2006 12:00:00 AM
Abstract :
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
Keywords :
carbon nanotubes; dielectric materials; filled polymers; magnetic shielding; microwave materials; absorbing composite; broadband characterization technique; broadband microwave; carbon nanotube composites; conductive dispersion; microwave absorbers; microwave electrical properties; nanocomposite materials; phenomenological electrical model; polymer dielectric material; polymer matrices; rheological data; shielding composite; Carbon nanotubes; Composite materials; Conducting materials; Dielectric materials; Dielectric measurements; Electric variables measurement; Microwave measurements; Microwave theory and techniques; Organic materials; Polymers; Carbon nanotubes (CNTs); microwave absorbers; nanocomposite materials;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2006.874889
