期刊
SURFACE & COATINGS TECHNOLOGY
卷 205, 期 1, 页码 219-223出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.06.036
关键词
Copper oxide nanoparticles; SiO(2) thin films; Sol-gel; Antibacterial property; Photocatalysts
资金
- Research Council of Sharif University of Technology
- Iran Nanotechnology Initiative Council
CuO nanoparticles with average diameter of about 20 nm were accumulated on surface of sol-gel silica thin films heat treated at 300 degrees C in air. Heat treatment of the CuO nanoparticles at 600 degrees C in a reducing environment resulted in effective reduction of the nanoparticles and penetration of them into the film. While the thin films heat treated at 300 degrees C exhibited a strong antibacterial activity against Escherichia coli bacteria, the reducing process decreased their antibacterial activity. However, by definition of normalized antibacterial activity (antibacterial activity/surface concentration of coppers) it was found that Cu nanoparticles were more toxic to the bacteria than the CuO nanoparticles (by a factor of similar to 2.1). Thus, the lower antibacterial activity of the reduced thin films was assigned to diffusion of the initially accumulated copper-based nanoparticles into the film. The CuO nanoparticles also exhibited a slight photocatalytic activity for inactivation of the bacteria (similar to 22% improvement in their antibacterial activity). Instead, the normalized antibacterial activity of the Cu nanoparticles covered by a thin oxide layer highly increased (similar to 63% improvement) in the photocatalytic process. A mechanism was also proposed to describe the better antibacterial activity of the Cu than CuO nanoparticles in dark and under light irradiation. (C) 2010 Elsevier B.V. All rights reserved.
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