title: Photoinduced charge separation in titania nanotubes.
abstract: The photocatalytic one-electron oxidation reaction of an aromatic compound during UV light irradiation of titania nanotubes and nanoparticles was investigated using time-resolved diffuse reflectance spectroscopy. Remarkably long-lived radical cations of the aromatic compound and trapped electrons were observed for the nanotubes when compared to those for nanoparticles. The influences of the morphology on the one-electron oxidation process of an aromatic compound adsorbed on the surface were discussed in terms of the charge recombination dynamics between the radical cation and electrons in TiO2.
authors.affiliation: The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Tachikawa
authors.forename: Sachiko
authors.initials: S
authors.lastname: Tojo
authors.forename: Mamoru
authors.initials: M
authors.lastname: Fujitsuka
authors.forename: Toru
authors.initials: T
authors.lastname: Sekino
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Majima
mesh_terms: D002384:Catalysis; D004583:Electrons; D006841:Hydrocarbons, Aromatic / Q000737:chemistry / Q000528:radiation effects; D053758:Nanoparticles / Q000737:chemistry / Q000528:radiation effects; D043942:Nanotubes / Q000737:chemistry / Q000528:radiation effects*; D010084:Oxidation-Reduction; D010777:Photochemistry; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D019265:Spectroscopy, Near-Infrared / Q000379:methods; D013997:Time Factors; D014025:Titanium / Q000737:chemistry / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D006841:Hydrocarbons, Aromatic; C009495:titanium dioxide; D014025:Titanium