Morphology-controlled synthesis of ZnO crystals with twinned structures and the morphology dependence of their antibacterial activities

Abstract ZnO crystals with twinned structures were prepared by using a hydrothermal reaction. N,N′-Dimethylethylenediamine and sodium 1-heptanesulfonate were used as the hydroxide ion generator and the morphology controller respectively. As the concentration of sodium 1-heptanesulfonate increases, the morphology of the ZnO crystals varies from thin hexagonal rods to thick hexagonal plates, and the ratio of the areas of the (001) polar and (110) nonpolar planes increases, as determined from XRD data. Further, the antibacterial activity of the ZnO crystals appears to increase with increases in the ratio of the areas of their (001) polar and (110) nonpolar planes, which provides insight into the morphology dependence of the antibacterial activity of ZnO.

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