Abstract

The antibacterial properties of polymethyl methacrylate (PMMA) are enhanced by coating with TiO 2 films. The transparent TiO 2 films on plasma-treated PMMA are prepared by sol–gel dip coating. The modified surfaces are characterized by XRD, AFM, ATR-FTIR, SEM, UV–vis spectroscopy, and contact angle measurements. Finally, the antibacterial properties are evaluated using the method of plate-counting of Staphylococcus aureus (gram positive) and Escherichia coli (gram negative). It is found that the anatase–TiO 2 film is well-conglutinated on PMMA surface with an average crystallite size of ca. 4 nm. The as-prepared TiO 2/PMMA exhibits excellent photoinduced antibacterial effect for the sterilization of bacteria under indoor natural light, and about 100% of both bacteria are inactivated within 2 h illumation. Compared to PMMA without any treatment, the superior anti-adhesion capability of the TiO 2/PMMA surface is also demonstrated.

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