Journal
APPLIED SURFACE SCIENCE
Volume 258, Issue 1, Pages 547-555Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.08.070
Keywords
Zinc oxide/tin dioxide nanocomposite; Antibacterial activity; Sol-gel film
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Funding
- Islamic Azad University, Shahreza Branch
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The nano-sized coupled oxides ZnO/SnO2 thin films in a molar ratio of 2:1 (Z2S), 1:1 (ZS) and 1:2 (ZS2) were prepared using sol-gel dip coating method and characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis spectroscopy. Escherichia coli (E. coli, ATCC 25922) was selected as a model for the Gram-negative bacteria to evaluate antibacterial property of composite samples compared with single ZnO (Z) and single SnO2 (S) films. The antibacterial activity has been studied applying the so-called antibacterial drop test under UV illumination. The bactericidal activity was estimated by relative number of bacteria survived calculated from the number of viable cells which form colonies on the nutrient agar plates. The influence of the SnO2-ZnO nanocomposite composition on the structural features and on the antibacterial properties of the thin films are reported and discussed. It is found that all coatings exhibited a high antibacterial activity. The coupled oxide photocatalyst Z2S has better photocatalytic activity to bacteria inactivation than ZS, ZS2, Z and S films. Furthermore, nanostructured films were active even in the absence of irradiation. (C) 2011 Elsevier B. V. All rights reserved.
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