title: Synthesis of Ag ion-implanted TiO2 thin films for antibacterial application and photocatalytic performance.
abstract: TiO2 thin films were deposited by spin coating method. Silver ions were implanted into the films using a Metal Vapor Vacuum Arc implanter. The antibacterial ability of implanted films was tested using Escherichia coli removal under fluorescent irradiation and in the dark. The concentration of E. coli was evaluated by plating technique. The photocatalytic efficiency of the implanted films was studied by degradation of methyl orange under fluorescent illumination. The surface free energy of the implanted TiO2 films was calculated by contact angle testing. Vitamin C was used as radical scavengers to explore the antibacterial mechanism of the films. The results supported the model that both generation of reactive oxygen species and release of silver ions played critical roles in the toxic effect of implanted films against E. coli. XPS experimental results demonstrated that a portion of the Ag(Ag(3+)) ions were doped into the crystalline lattice of TiO2. As demonstrated by density functional theory calculations, the impurity energy level of subtitutional Ag was responsible for enhanced absorption of visible light. Ag ion-implanted TiO2 films with excellent antibacterial efficiency against bacteria and decomposed ability against organic pollutants could be potent bactericidal surface in moist environment.
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China. Electronic address: hou226@mail.tjnu.edu.cn.
authors.forename: Xinggang
authors.initials: X
authors.lastname: Hou
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China.
authors.forename: Huiyan
authors.initials: H
authors.lastname: Ma
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Deng
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China.
authors.forename: Yukai
authors.initials: Y
authors.lastname: Ai
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China.
authors.forename: Xinlei
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Mao
authors.affiliation: Department of Physics, Tianjin Normal University, Tianjin 300387, China.
authors.forename: Dejun
authors.initials: D
authors.lastname: Li
authors.affiliation: Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Liao
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D002384:Catalysis; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D055668:Photochemical Processes; D012834:Silver / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; C009495:titanium dioxide; D012834:Silver; D014025:Titanium
keywords: Ag ion-implantation; Bactericidal; Photocatalysis; Reactive oxygen species; TiO(2) films