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Double-walled carbon nanotube-based polymer composites for electromagnetic protection

Published online by Cambridge University Press:  25 November 2010

Sébastien Pacchini ,
David Dubuc ,
Emmanuel Flahaut  and
Katia Grenier
Sébastien Pacchini*
Affiliation:
CNRS; LAAS; 7 avenue du colonel Roche, F-31077 Toulouse, France. Phone: +33 56133 6964. Université de Toulouse; UPS, INSA, INP, ISAE; LAAS; F-31077 Toulouse, France.
David Dubuc
Affiliation:
CNRS; LAAS; 7 avenue du colonel Roche, F-31077 Toulouse, France. Phone: +33 56133 6964. Université de Toulouse; UPS, INSA, INP, ISAE; LAAS; F-31077 Toulouse, France.
Emmanuel Flahaut
Affiliation:
Université de Toulouse; UPS, INP; Institut Carnot Cirimat; 118, route de Narbonne, F-31062 Toulouse Cedex 9, France. CNRS; Institut Carnot Cirimat; F-31062 Toulouse, France.
Katia Grenier
Affiliation:
CNRS; LAAS; 7 avenue du colonel Roche, F-31077 Toulouse, France. Phone: +33 56133 6964. Université de Toulouse; UPS, INSA, INP, ISAE; LAAS; F-31077 Toulouse, France.
*
Corresponding author: S. Pacchini Email: pacchini@laas.fr
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Abstract

In this paper, we present a microwave absorber based on carbon nanotubes (CNT) dispersed inside a BenzoCycloButen® (BCB) polymer. The high aspect ratio and remarkable conductive characteristics of CNT give rise to good absorbing properties for electromagnetic protecting in microelectronic devices with very low concentration. In this article, nanocomposites are prepared using a solution-mixing method and are then evaluated and modeled by means of coplanar test structures. First, CNT concentrations are quantified by image processing. The nanocomposites implemented with coplanar test waveguides are then characterized using a vector network analyzer from 40 MHz to 20 GHz. An algorithm is developed to calculate the propagation constant “γ”, attenuation constant “α”, and relative effective complex permittivity (ɛreff = ɛreff′ − jɛreff″) for each CNT concentration. The extracted effective parameters are verified using the electromagnetic FEM-based Ansoft's® high frequency structure simulator (HFSS). Power absorption (PA) of 7 dB at 15 GHz is obtained with only 0.37 weight percent of CNT concentration in the polymer matrix. The resulting engineerable and controllable composite provides consequently a novel degree of freedom to design and optimize innovative microwave components.

Keywords

Carbon nanotubes (CNT)BenzoCycloButen (BCB) polymerPower absorption
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 2 , Issue 5 , October 2010 , pp. 487 - 495
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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