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INFLUENCE OF THICKNESS ON ELECTRICAL PROPERTIES OF POLYSILOXANE-CARBON NANOTUBE COMPOSITES

G. Hidden1, L. Boudou1, S. Remaury2, P. Nabarra2, J. Martinez Vega1,*

Affiliation

  1. Laboratoire de Génie Electrique de Toulouse (UMR-CNRS 5003) Université Paul Sabatier -Bat 3R3- 118 Route de Narbonne 31062 Toulouse Cedex, France
  2. Centre National d’Etudes Spatiales (CNES) 18 av Edouard Belin 31401 Toulouse Cedex 04, France

Abstract

In orbit, satellites are exposed to significant thermal variations. In order to ensure reliable operation of their on-board systems and equipment, a thermal control of the spacecraft is necessary using cold, neutral or warm coatings. The Materials and Coatings Laboratory of the Thermal Control Service at CNES has elaborated a cold coating version by using a polysiloxane deposit on a metal substrate (such as polished aluminum or vacuum deposited silver). In geostationary orbit, polysiloxane, which has a high electrical resistivity (>1017W.m), can accumulate implanted charges which can give rise to electrostatic discharges and damage the neighbouring electronic systems. To prevent any electrostatic discharge problems in geostationary orbit, the resistivity of coatings should be reduced without altering their thermo-optical properties. Several methods have been studied to this effect. At present, the incorporation of carbon nanotubes (CNTs) in the polysiloxane matrix is in the process of being tested. Nanotubes are particularly interesting for their electrical properties and their geometry. In this paper, the influence of thickness on electrical and thermo-optical properties of CNT-Polysiloxane composites is reported. This study was performed within a temperature range of -100 to +200°C, carbon nanotube content remaining constant throughout..

Keywords

Polysilonane-carbon nanotube composite, AC conductivity, DC conductivity, Thermo-optical properties.

Submitted at: May 13, 2004
Accepted at: June 22, 2004

Citation

G. Hidden, L. Boudou, S. Remaury, P. Nabarra, J. Martinez Vega, INFLUENCE OF THICKNESS ON ELECTRICAL PROPERTIES OF POLYSILOXANE-CARBON NANOTUBE COMPOSITES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 3, pp. 1065-1070 (2004)