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Title: Diameter dependence of the void formation in the oxidation of nickel nanowires
Authors: Ren, Y.
Chiam, S.Y.
Chim, W.K. 
Issue Date: 10-Jun-2011
Citation: Ren, Y., Chiam, S.Y., Chim, W.K. (2011-06-10). Diameter dependence of the void formation in the oxidation of nickel nanowires. Nanotechnology 22 (23) : -. ScholarBank@NUS Repository.
Abstract: In this work, we show how the vacancy diffusion length scale must be considered, in the context of the diameter of a nanowire, when utilizing the Kirkendall phenomenon in the fabrication of metal oxide nanotubes starting from metal nanowires. We find that the diameter of the nanowire relative to the diffusion length scale of the vacancy will affect greatly the type of voids that can be generated. By using a larger diameter nickel nanowire, we show that segmented heterojunction void formation can be avoided and that the resulting structure will serve as a precursory 'template' for subsequent oxidation processes at high temperatures. In doing so, we can prevent the formation of bamboo-like structures and obtain uniform nickel oxide nanotubes through direct oxidation that has proven to be difficult previously. The result from this work is also significant as the interplay of vacancy diffusion length and nanostructure dimension is important in the oxidation of other types of metal nanostructures, especially when void formation and the Kirkendall effect are involved. © 2011 IOP Publishing Ltd.
Source Title: Nanotechnology
ISSN: 09574484
DOI: 10.1088/0957-4484/22/23/235606
Appears in Collections:Staff Publications

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