title: Antibacterial performance of photocatalyst thin film fabricated by defection effect in visible light.
abstract: We have developed a new photocatalyst thin film that has strong antibacterial action in visible light. In this study the radiofrequency (RF) sputter technique was used to deposit a defective titanium dioxide (TiO(x), x < 2) photocatalyst thin film (120 nm thickness) on glass and steel substrates. In the ultraviolet (UV)-visible spectrum analysis, the defective TiO(x) thin film was found to generate the red shift effect. To determine whether the defective TiO(x) thin film has antibacterial ability under visible light, we designed a series of experiments according to the Japanese Industrial Standards (JIS) Committee standard for testing antibacterial performance and for exploring the impact of surface roughness of substrate. Our results show that the antibacterial performance rate against Escherichia coli could reach 99.99% in visible light. We also proved that the coating technology can be applied effectively to surfaces with different degrees of roughness. It is suitable for protecting both human health and the natural environment.
authors.affiliation: Department of Chemistry, Chinese Military Academy, Kaohsiung, Taiwan.
authors.forename: Kuan-Jiunn
authors.initials: KJ
authors.lastname: Shieh
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Yu-Hwe
authors.initials: YH
authors.lastname: Lee
authors.forename: Shinn-Der
authors.initials: SD
authors.lastname: Sheu
authors.forename: Yu-Tsung
authors.initials: YT
authors.lastname: Liu
authors.forename: Yau-Chyr
authors.initials: YC
authors.lastname: Wang
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D002384:Catalysis; D004926:Escherichia coli / Q000187:drug effects; D008027:Light; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; C009495:titanium dioxide; D014025:Titanium