Structures of Pt species derived from Pt4(μ-CH3COO)8 on an α-Al2O3(0001) single-crystal surface were studied by means of in-situ polarization-dependent total reflection fluorescence XAFS (EXAFS and XANES) techniques. The Pt4 cluster framework was destroyed upon the deposition of Pt4(μ-CH3COO)8 by the reaction on the α-Al2O3 surface at room temperature. The isolated Pt species were converted to one-atomic layer thick Pt rafts with the Pt-Pt distance of 0.273 nm when the cluster was treated with H2 at 373 K. The raftlike Pt clusters were stabilized by the formation of direct Pt-O-Al bonding with the α-Al2O3 surface. The raftlike Pt clusters were redispersed to isolated oxidized Pt species by the reaction with NO. They were also transferred to three-dimensional Pt particles by reduction with H2 at 773 K.
|Number of pages||8|
|Journal||Journal of Physical Chemistry B|
|Publication status||Published - 1997 Jul 10|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry