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Fast vapor phase growth of SiO2 nanowires via surface-flow on Ag core/SiO2 shell structure

Authors :
Lei Gao
Ailing Ji
Nianpeng Lu
Chaorong Li
Zexian Cao
Source :
AIP Advances, Vol 2, Iss 1, Pp 012187-012187-7 (2012)
Publication Year :
2012
Publisher :
AIP Publishing LLC, 2012.

Abstract

Uniform, millimeter-long SiO2 nanowires were grown from co-evaporation of Ag2O and SiO powders. The ‘frozen’ growth scenario by cooling enables revelation of the vapor-liquid-solid mechanism here in action, which is generally inaccessible due to the high temperature and high pressure condition. Ag core/SiO2 shell preformed in the vapor and wetting the substrate will expose its liquid Ag-core to catalyze nanowire growth, at a rate over 10 nm/s, via viscous flow of the encasing SiO2 layer which precipitates through a liquid neck zone. This method is characteristic of high-yield of catalytic seeds free from overgrowth or consuming, easy control of wire thickness by vapor pressure adjustment, enhanced rooting ability since catalyst deposition on substrate becomes dispensable, etc. Also spinning growth of nanowires observed in many other circumstances can be explained by the viscous flow mechanism.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
2
Issue :
1
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.8b0530b77f1345198e85bac2353f3724
Document Type :
article
Full Text :
https://doi.org/10.1063/1.3700232