First direct visualization of spillover species emitted from pt nanoparticles.
We studied the methanol adsorption behavior of Pt nanoparticles that were vacuum-deposited on a TiO(2)(110) surface at room temperature by using an ultrahigh vacuum (UHV) scanning tunneling microscope (STM). A large number of bright spots were observed on fivefold-coordinated Ti (Ti(5c)) rows of the TiO(2)(110) surface after exposure of the Pt/TiO(2)(110) to methanol vapor. We assigned the bright spots to methoxy species. These were mobile and were found to hop along the Ti(5c) rows. In situ time-resolved STM observations of the formation and migration of the bright spots on the Pt/TiO(2)(110) were carried out in the presence of methanol. The bright spots were produced at the periphery of the Pt nanoparticles and migrated to the substrate Ti(5c) rows. We discuss the spillover process and behavior of the methoxy species on the Pt/TiO(2)(110).
Catalysis Research Center, Hokkaido University, Kita-ku N21W10, Sapporo, Hokkaido 001-0021, Japan.
Satoru
S
Takakusagi
Ken-ichi
K
Fukui
Ryugo
R
Tero
Kiyotaka
K
Asakura
Yasuhiro
Y
Iwasawa
D000327:Adsorption; D053768:Metal Nanoparticles / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D014618:Vacuum; D014835:Volatilization
C009495:titanium dioxide; D010984:Platinum; D014025:Titanium; D000432:Methanol