Please use this identifier to cite or link to this item:
Title: From germanium nanowires to germanium - Silicon oxide nanotubes: Influence of germanium tetraiodide precursor
Authors: Huang, J.
Chim, W.K. 
Wang, S.
Chiam, S.Y.
Wong, L.M.
Issue Date: 11-Feb-2009
Source: Huang, J.,Chim, W.K.,Wang, S.,Chiam, S.Y.,Wong, L.M. (2009-02-11). From germanium nanowires to germanium - Silicon oxide nanotubes: Influence of germanium tetraiodide precursor. Nano Letters 9 (2) : 583-589. ScholarBank@NUS Repository.
Abstract: Growth of semiconductor nanowires has attracted immense attention in the field of nanotechnology as nanowires are viewed as the potential basic building blocks of future electronics. The recent renewed interest in germanium as a material for nanostructures can be attributed to its higher carrier mobility and larger Bohr radius as compared to silicon. Self-assembly synthesis of germanium nanowires (GeNWs) is often obtained through a vapor - liquid - solid mechanism, which is essentially a catalytic tip-growth process. Here we demonstrate that by introducing an additional precursor, germanium tetraiodide (Gel 4), in a conventional furnace system that produces GeNWs on silicon, tubular structures of germanium - silicon (GeSi) oxide can be obtained instead. Incorporation of Gel 4 results in passivation of the metal catalyst, preventing the occurrence of supersaturation, a prerequisite for the catalytic tip growth. We infer that passivation of the metal catalyst impedes Ge incorporation into the catalyst, leaving the catalyst rim as the only active sites for nucleation of both Si and Ge and thus resulting in the growth of GeSi oxide nanotubes via a root-growth process. © 2009 American Chemical Society.
Source Title: Nano Letters
ISSN: 15306984
DOI: 10.1021/n18027137
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Feb 20, 2018

Page view(s)

checked on Feb 23, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.