Ag nanoparticle sheet as a marker of lateral remote photocatalytic reactions.
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.
Nagahiro
Takeshi
T
Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aobaku, Sendai, Japan.
Ishibashi
Kenichi
K
Kimura
Yasuo
Y
Niwano
Michio
M
Hayashi
Tomohiro
T
Ikezoe
Yasuhiro
Y
Hara
Masahiko
M
Tatsuma
Tetsu
T
Tamada
Kaoru
K
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
C009495:titanium dioxide; D012834:Silver; D014025:Titanium