Please use this identifier to cite or link to this item: https://doi.org/10.1021/n18027137
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. https://doi.org/10.1021/n18027137
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
URI: http://scholarbank.nus.edu.sg/handle/10635/82386
ISSN: 15306984
DOI: 10.1021/n18027137
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