Facet Stability in Oxygen-Induced Nanofaceting of Re(1231)

Journal Article · Mon Jan 01 04:00:00 EST 2007 · ACS Nano

DOI:https://doi.org/10.1021/nn700238r· OSTI ID:960143

Wang, H; Chan, A; Chen, W; Kaghazchi, P; Jacob, T; Madey, T

The stability of the various facets in oxygen-induced faceting of Re(121) has been studied by low-energy electron diffraction, scanning tunneling microcopy, and synchrotron-based high-resolution X-ray photoemission spectroscopy. When Re(121) is annealed at 800-1200 K in oxygen (10-7 Torr), the surface becomes completely covered with nanometer-scale facets, and its morphology depends on the substrate temperature and oxygen exposure. Especially, the (111) facet competes with the (101) facet in determining the surface morphology, and the stability of each facet relies on oxygen coverage. Using density functional theory, the O-Re binding energies on the facets for various oxygen concentrations are calculated to explain how the oxygen coverage affects the anisotropy of surface free energy, which in turn determines the morphology of the faceted surface.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 960143
• Report Number(s): BNL--83129-2009-JA
• Journal Information: ACS Nano, Journal Name: ACS Nano Journal Issue: 5 Vol. 1
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ANISOTROPY
ELECTRON DIFFRACTION
FREE ENERGY
FUNCTIONALS
MORPHOLOGY
OXYGEN
PHOTOEMISSION
SPECTROSCOPY
STABILITY
SUBSTRATES
TUNNELING
national synchrotron light source