Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 71, Issue 2, Pages 95-100Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2010.10.016
Keywords
Adhesive joints; Carbon nanotubes; Electrical properties
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Funding
- Natural Sciences and Engineering Research Council of Canada
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Bonded joints prepared with conductive epoxy adhesive based on carbon nanotubes (CNTs) display an unusually high resistance mainly due to the high contact resistivity at the adhesive metal interface. A new method is proposed to reduce efficiently the contact resistivity by forcing a controlled amount of electric current through the bonded joint. Current treatment at 0.5 A/cm(2) of current densities for 30 s typically reduces to up to 10 times the contact resistivity. Apart from noble metals, all other metals are usually covered by a more or less conductive oxide layer. This oxide layer is the main cause for high contact resistivity. During the current treatment large gradients of electric field developed around the highly curved CNTs are capable of breaking down locally the oxide layer generating conductive channels. Static shear strength and fatigue resistance of the bonded joint are not affected by the current treatment. (C) 2010 Elsevier Ltd. All rights reserved.
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