Photoinduced charge separation in titania nanotubes.
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.
Tachikawa
Takashi
T
The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan.
Tojo
Sachiko
S
Fujitsuka
Mamoru
M
Sekino
Toru
T
Majima
Tetsuro
T
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
D006841:Hydrocarbons, Aromatic; C009495:titanium dioxide; D014025:Titanium