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Issue 18, 2011
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Aqueous pathways for the formation of zinc oxide nanoparticles

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We examine the effect of reactant concentrations, temperatures and feeding methods on the morphology of ZnO formed when reacting solutions of ZnSO4 and NaOH. The catalytic effect of hydroxide in excess relative to the stoichiometric ratio is considered. It is shown that, having fixed other reaction conditions, the end-products, particle structures and size strongly depend on the mole ratio of the precursors. The presence of zinc salt hydroxide species was confirmed at sub-stoichiometric ratios in slightly acidic conditions. At the stoichiometric ratio both zinc hydroxide and zinc oxide are formed, while only zinc oxide forms in an excess of hydroxide. The method of feeding the reactants into the reaction vessel also has a strong influence on the end-product properties, as does the reaction temperature. By control of these parameters the specific surface area could be varied from 10 to 33 m2 g−1, the particle shape could be varied from equiaxed, through to star-like and needle-like, and the particle size may be varied from 50 to over 300 nm.

Graphical abstract: Aqueous pathways for the formation of zinc oxide nanoparticles

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The article was received on 12 Dec 2010, accepted on 18 Feb 2011 and first published on 16 Mar 2011

Article type: Paper
DOI: 10.1039/C0DT01748E
Citation: Dalton Trans., 2011,40, 4871-4878
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    Aqueous pathways for the formation of zinc oxide nanoparticles

    A. Moezzi, M. Cortie and A. McDonagh, Dalton Trans., 2011, 40, 4871
    DOI: 10.1039/C0DT01748E

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