title: Ag nanoparticle sheet as a marker of lateral remote photocatalytic reactions.
abstract: The lateral remote photocatalytic activity of TiO(2) nanotubes fabricated by anodic oxidation, was characterized by use of a 'silver nanosheet' as a marker. The silver nanosheet is a two-dimensional crystalline film composed of myristate-capped silver nanoparticles (d = 5 nm), which has a sharp localized plasmon absorption band at lambda(max) = 470 nm. A quartz substrate was coated with TiO(2) nanotubes to a coverage of 10% and then covered with a silver nanosheet. Upon UV irradiation a rapid decrease in the intensity of the 470 nm plasmon band and an increase in the long-wavelength absorption (550-1000 nm) band were clearly confirmed, indicating fusion of the nanoparticles due to decomposition of the myristate capping agent. Surface morphology measured by high-resolution scanning electron microscopy (SEM) and atomic force microscopy (AFM) revealed the decomposition and fusion of silver nanoparticles even in regions of the surface a micron away from the TiO(2) nanotubes.
authors.affiliation: Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aobaku, Sendai, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nagahiro
authors.forename: Kenichi
authors.initials: K
authors.lastname: Ishibashi
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Kimura
authors.forename: Michio
authors.initials: M
authors.lastname: Niwano
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Hayashi
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ikezoe
authors.forename: Masahiko
authors.initials: M
authors.lastname: Hara
authors.forename: Tetsu
authors.initials: T
authors.lastname: Tatsuma
authors.forename: Kaoru
authors.initials: K
authors.lastname: Tamada
mesh_terms: D002384:Catalysis; D004566:Electrodes; D053768:Metal Nanoparticles / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D043942:Nanotubes / Q000737:chemistry; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: C009495:titanium dioxide; D012834:Silver; D014025:Titanium