Nano Archive

Synthesis of Ag–TiO 2 composite nano thin film for antimicrobial application

Yu, Binyu and Leung, Kar Man and Guo, Qiuquan and Lau, Woon Ming and Yang, Jun (2011) Synthesis of Ag–TiO 2 composite nano thin film for antimicrobial application. Nanotechnology, 22 (11). p. 115603.

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TiO 2 photocatalysts have been found to kill cancer cells, bacteria and viruses under mild UV illumination, which offers numerous potential applications. On the other hand, Ag has long been proved as a good antibacterial material as well. The advantage of Ag–TiO 2 nanocomposite is to expand the nanomaterial's antibacterial function to a broader range of working conditions. In this study neat TiO 2 and Ag–TiO 2 composite nanofilms were successfully prepared on silicon wafer via the sol–gel method by the spin-coating technique. The as-prepared composite Ag–TiO 2 and TiO 2 films with different silver content were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS) to determine the topologies, microstructures and chemical compositions, respectively. It was found that the silver nanoparticles were uniformly distributed and strongly attached to the mesoporous TiO 2 matrix. The morphology of the composite film could be controlled by simply tuning the molar ratio of the silver nitrate aqueous solution. XPS results confirmed that the Ag was in the Ag 0 state. The antimicrobial effect of the synthesized nanofilms was carried out against gram-negative bacteria ( Escherichia coli ATCC 29425) by using an 8 W UV lamp with a constant relative intensity of 0.6 mW cm − 2 and in the dark respectively. The synthesized Ag–TiO 2 thin films showed enhanced bactericidal activities compared to the neat TiO 2 nanofilm both in the dark and under UV illumination.

Item Type:Article
ID Code:11158
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:24
Last Modified:02 Nov 2011 00:47

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