Effect of lattice constant of zinc oxide on antibacterial characteristics

Author： Yamamoto Osamu Komatsu Miyako Sawai Jun Nakagawa Zenbe-e

ISSN： 0957-4530

Source： Journal of Materials Science: Materials in Medicine, Vol.15, Iss.8, 2004-08, pp. : 847-851

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Abstract

Zinc oxide powders were heated in different atmospheres at 800 and 1400 °C, of which the characterization and the antibacterial activity were studied by X-ray diffractometry and the measurement of the change in electrical conductivity with bacterial growth. The diffraction peaks corresponding to zinc oxide with hexagonal type structure were detected in all samples, which shifted in low-angle side with the increase in the oxidizability of atmosphere during heat-treatment. From the results of calculating lattice constants, a₀ and c₀, it was found that the value of c₀ in hexagonal structure increased with the increase in the oxidizability of atmosphere. On the samples heated at 1400 °C, the changes of the c₀ value were less than those at 800 °C. However, no change of the a₀ value showed, irrespective of atmosphere and temperature. Hydrogen peroxide that contributes to the occurrence of antibacterial activity was found to generate from all samples, and the generation amount increased with the increase of c₀ value; incidently the amount in the samples heated at 1400 °C was less than that at 800 °C. The antibacterial activity of zinc oxide increased with the increase of c₀ value; that is, it was found that the value of c₀ in crystal structure affected the antibacterial activity of zinc oxide.