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Title: Improving the morphological stability of a polycrystalline tungsten nanowire with a carbon shell
Authors: You, G.F.
Gong, H. 
Thong, J.T.L. 
Issue Date: 2010
Citation: You, G.F., Gong, H., Thong, J.T.L. (2010). Improving the morphological stability of a polycrystalline tungsten nanowire with a carbon shell. Nanotechnology 21 (19) : -. ScholarBank@NUS Repository.
Abstract: Polycrystalline tungsten nanowire is studied for its potential as an interconnect for nanodevices. At elevated temperatures arising from Joule heating at high current densities, a bare 40nm nanowire was observed in situ in a transmission electron microscope to undergo grain grooving that eventually led to its breakage. By overcoating a carbonaceous layer onto the nanowire surface, the tungsten-carbon core-shell structure was found to sustain a much higher current density of about 3 × 107Acm-2 before failure, despite significantly higher peak temperature as a result of Joule heating. Failure occurred as a result of a different form of morphological transformation leading finally to breakage by electromigration. These findings suggest that the metal-carbon core-shell structure provides a solution to circumvent morphological instability and increase the current-carrying capability of metallic polycrystalline nanowires. © 2010 IOP Publishing Ltd.
Source Title: Nanotechnology
ISSN: 09574484
DOI: 10.1088/0957-4484/21/19/195701
Appears in Collections:Staff Publications

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