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Title: New insight into growth mechanism of ZnO nanowires electrodeposited from nitrate-based solutions
Authors: Khajavi, M.R.
Blackwood, D.J. 
Cabanero, G.
Tena-Zaera, R.
Keywords: Electrodeposition
Growth mechanism
Nitrate solutions
ZnO nanowires
Issue Date: 1-May-2012
Citation: Khajavi, M.R., Blackwood, D.J., Cabanero, G., Tena-Zaera, R. (2012-05-01). New insight into growth mechanism of ZnO nanowires electrodeposited from nitrate-based solutions. Electrochimica Acta 69 : 181-189. ScholarBank@NUS Repository.
Abstract: The electrodeposition of ZnO nanowire arrays from nitrate-based solutions was systematically studied as a function of electrodeposition parameters such as the concentration of zinc and nitrate ion precursors, applied current and charge. A model based on the local concentrations of Zn 2+ and OH -, generated from the electrochemical reduction of NO 3 -, is proposed to explain the growth mechanism of ZnO nanowires. The ratio between OH - production and Zn 2+ diffusion rates is identified as a crucial parameter, determining the nanowire growth regime and therefore the nanowire dimensions. As a result of the model and using NaNO 3 as an additional source of NO 3 -, the versatility of ZnO deposition was enhanced in comparison with the deposition from sole Zn(NO 3) 2 solutions. Arrays of large aspect ratio (∼450) ZnO nanowires were successfully obtained at growth rates compatibles with large-scale production. The obtained ZnO nanowire arrays were characterized and analyzed by field emission scanning and transmission electron microscopies, X-ray diffraction, X-ray photoemission and optical spectroscopies. © 2012 Elsevier Ltd.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/j.electacta.2012.02.096
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