Nano Archive

Facet Stability in Oxygen-Induced Nanofaceting of Re(121)

Wang, Hao and Chan, Ally S. Y. and Chen, Wenhua and Kaghazchi, Payarn and Jacob, Timo and Madey, Theodore E. (2007) Facet Stability in Oxygen-Induced Nanofaceting of Re(121). ACS NANO, 1 (5). pp. 449-455.

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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.

Item Type:Article
Uncontrolled Keywords:rhenium; faceting; oxygen; scanning tunneling microscopy; low-energy electron diffraction; photoemission spectroscopy; chemisorption; oxidation
Subjects:Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:5922
Deposited By:IoN
Deposited On:29 Jul 2009 12:19
Last Modified:29 Jul 2009 12:19

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