The role of NiOx overlayers on spontaneous growth of NiSix nanowires from Ni seed layers

Nano Letters
Kibum KangMoon-Ho Jo

Abstract

We report a controllably reproducible and spontaneous growth of single-crystalline NiSix nanowires using NiOx/Ni seed layers during SiH4 chemical vapor deposition (CVD). We provide evidence that upon the reactions of SiH4 (vapor)-Ni seed layers (solid), the presence of the NiOx overlayer on Ni seed layers plays the key role to promote the spontaneous one-dimensional growth of NiSix single crystals without employing catalytic nanocrystals. Specifically, the spontaneous nanowire formation on the NiOx overlayer is understood within the frame of the SiH4 vapor-phase reaction with out-diffused Ni from the Ni underlayers, where the Ni diffusion is controlled by the NiOx overlayers for the limited nucleation. We show that single-crystalline NiSix nanowires by this self-organized fashion in our synthesis display a narrow diameter distribution, and their average length is set by the thickness of the Ni seed layers. We argue that our simple CVD method employing the bilayers of transition metal and their oxides as the seed layers can provide implication as the general synthetic route for the spontaneous growth of metal-silicide nanowires in large scales.

References

Jan 10, 2002·Journal of the American Chemical Society·José A RodriguezManuel Pérez
Sep 21, 2004·Nature Materials·Ann I PerssonL Reine Wallenberg
Jul 13, 2006·Nano Letters·Joondong Kim, Wayne A Anderson
Aug 10, 2006·Nano Letters·Andrew L SchmittSong Jin
Aug 10, 2006·Nano Letters·Yu-Lun ChuehChii-Dong Chen
Sep 15, 2006·The Journal of Physical Chemistry. B·Andrew L SchmittSong Jin
Apr 14, 2007·Nano Letters·Kwanyong SeoBongsoo Kim

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Citations

Jul 4, 2013·Nanoscale Research Letters·Chi-Ming LuKuo-Chang Lu
Oct 12, 2011·Nanoscale·Yung-Chen LinYu Huang
Aug 14, 2008·Nano Letters·Jessica L Lensch-FalkLincoln J Lauhon
Nov 6, 2008·Journal of the American Chemical Society·Jeremy M HigginsSong Jin
Apr 15, 2010·Nano Letters·Jeremy M HigginsSong Jin
Apr 30, 2010·ACS Nano·Kwanyong SeoBongsoo Kim
Nov 3, 2010·Nano Letters·Keith T ChanEric E Fullerton

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