Role of VI/II ratio on the growth of ZnO nanostructures using chemical bath deposition

In this paper the growth process and morphological evolution of ZnO nanostructures were investigated in a series of experiments using chemical bath deposition. The experimental results indicate that the morphological evolution depends on the reaction conditions, particularly on OH− to Zn2+ ratio (wh...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2012-05, Vol.407 (10), p.1672-1674
Main Authors: Urgessa, Z.N., Oluwafemi, O.S., Botha, J.R.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Density
Deposition
Evolution
Exact sciences and technology
Materials science
Methods of nanofabrication
Nanocomposites
Nanomaterials
Nanorods
Nanostructure
Nanostructures
Physics
Self-assembly
VI/II ratio
Zinc oxide
ZnO
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Summary:In this paper the growth process and morphological evolution of ZnO nanostructures were investigated in a series of experiments using chemical bath deposition. The experimental results indicate that the morphological evolution depends on the reaction conditions, particularly on OH− to Zn2+ ratio (which directly affects the pH). For low VI/II ratios, quasi-spherical nanoparticles of an average diameter 30nm are obtained, whereas for larger VI/II ratios, nanorods with an average diameter less than 100nm are produced, which indicates that by systematically controlling the VI/II ratio, it is possible to produce different shapes and sizes of ZnO nanostructures. A possible mechanism for the nanostructural change of the as-synthesized ZnO from particle to rod was elucidated based on the relative densities of H+ and OH− in the solution.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2011.09.114