Self-cleaning and antibacterial of E.coli properties of TiO2/SnO2 composites thin films

Abstract

TiO2/SnO2 composites thin films containing 0 to 5% SnO2 coated on glass substrate were prepared by sol-gel dip coating method. The prepared composites thin films were synthesized at the temperature of 500 °C for 2 h with a heating rate of 10 °C/min. The microstructure of synthesized TiO2/SnO2 composites thin films were characterized by XRD and SEM. The self-cleaning properties of TiO2/SnO2 composites thin films were evaluated by means of contact angle of water droplet on the films under UV irradiation. Finally, composites thin films were tested their antibacterial property by using Escherichia coli form (E.coli) under irradiation of UV light. The concentration of E.coli was evaluated by plating technique. The result showed that TiO2/1SnO2 composites thin film has highest self-cleaning properties (small contact angle, 6.4° for 60 min) and antibacterial of E.coli properties (80.67% for 3 h).