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The Effect of Divalent Metal Ions on the Morphology of Zinc Oxide Synthesized from Layered Zinc Hydroxide Acetate

Materials Transactions, ISSN: 1345-9678, Vol: 63, Issue: 4, Page: 636-643
2022
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ZnO was synthesized by using layered zinc hydroxide acetate (ZHA), as a precursor. ZHA was aged in zinc acetate (ZnAc), magnesium acetate (MgAc), and barium acetate (BaAc) aqueous solutions under hydrothermal condition. The effect of divalent metal ions, Zn, Mg and Ba, on the morphology of ZnO was studied. Results show that thin and thick plate-like and rod-like ZnO particles were synthesized for aging in ZnAc, MgAc and BaAc aqueous solution, respectively. In addition, the length to the c-axis direction became smaller in ZnAc and MgAc solution, and longer in BaAc solution, respectively, by increasing the concentration. Zn and Mg complexes with hydroxide and acetate ion are stable in aqueous solution. They adsorb on the growth plane instead of the growth unit of ZnO, Zn(OH), and would inhibit the c-axis direction growth. Thus, ZnO particles with shorter length are obtained. On the other hand, since Ba complexes are unstable, Ba ions would not affect the morphology of ZnO, and therefore ZnO particles with longer length are obtained. It is concluded that morphology of ZnO, especially the c-axis length, is controlled by selecting metal ions with appropriate complex stability constants.

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