The wear processes of gold coated multi-walled carbon nanotube surfaces used as electrical contacts for micro-electro-mechanical switching


McBride, J.W. (2010) The wear processes of gold coated multi-walled carbon nanotube surfaces used as electrical contacts for micro-electro-mechanical switching. Nanoscience and Nanotechnology Letters, 2, (4), 357-361. (doi:10.1166/nnl.2010.1109).

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Description/Abstract

An experimental investigation of gold coated, multi-walled carbon nanotube (CNT) surfaces was previously conducted, to determine the limits as electrical contacts. The results are summarized. The multi-walled CNT's (MWCNT's) were synthesized on a silicon planar and sputter coated with a gold film. The planar surfaces mounted on the tip of a piezo-electric actuator and mated with a coated Au hemispherical probe. The conditions typical of MEMS relay applications; (4 V, 1-10 mA) with an applied force of 1 mN. No failures were observed below, 10 × 106 cycles; to determine the limits, the current level was increased in stages to 50 mA. At 20 mA, the contacts were deemed to have failed due to an increased contact resistance at 70 × 106 cycles. In this paper the failure mechanism is described as a fine transfer mechanism linked to the thermodynamic processes at the contact interface as the contacts open, known as molten metal bridge transfer.

Item Type: Article
ISSNs: 1941-4900 (print)
1941-4919 (electronic)
Keywords: carbon nanotube surfaces, mems switching surfaces, carbon nanotube, composites
Subjects: Q Science > QC Physics
T Technology > T Technology (General)
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 191611
Date Deposited: 22 Jun 2011 14:46
Last Modified: 27 Mar 2014 19:43
URI: http://eprints.soton.ac.uk/id/eprint/191611

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