Epitaxial oxide bilayer on Pt (001) nanofacets.
We observed an epitaxial, air-stable, partially registered (2 × 1) oxide bilayer on Pt (001) nanofacets [V. Komanicky, A. Menzel, K.-C. Chang, and H. You, J. Phys. Chem. 109, 23543 (2005)]. The bilayer is made of two half Pt layers; the top layer has four oxygen bonds and the second layer two. The positions and oxidation states of the Pt atoms are determined by analyzing crystal truncation rods and resonance scattering data. The positions of oxygen atoms are determined by density functional theory (DFT) calculations. Partial registry on the nanofacets and the absence of such registry on the extended Pt (001) surface prepared similarly are explained in DFT calculations by strain relief that can be accommodated only by nanoscale facets.
Materials Science Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne Illinois 60439, USA.
Daniel
D
Hennessy
Vladimir
V
Komanicky
Hakim
H
Iddir
Michael S
MS
Pierce
Andreas
A
Menzel
Kee-Chul
KC
Chang
Andi
A
Barbour
Peter
P
Zapol
Hoydoo
H
You