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

Abstract

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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
960143
Report Number(s):
BNL-83129-2009-JA
TRN: US201016%%1287
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Nano; Journal Volume: 1; Journal Issue: 5
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; ELECTRON DIFFRACTION; FREE ENERGY; FUNCTIONALS; MORPHOLOGY; OXYGEN; PHOTOEMISSION; SPECTROSCOPY; STABILITY; SUBSTRATES; TUNNELING; national synchrotron light source

Citation Formats

Wang,H., Chan, A., Chen, W., Kaghazchi, P., Jacob, T., and Madey, T. Facet Stability in Oxygen-Induced Nanofaceting of Re(1231). United States: N. p., 2007. Web. doi:10.1021/nn700238r.
Wang,H., Chan, A., Chen, W., Kaghazchi, P., Jacob, T., & Madey, T. Facet Stability in Oxygen-Induced Nanofaceting of Re(1231). United States. doi:10.1021/nn700238r.
Wang,H., Chan, A., Chen, W., Kaghazchi, P., Jacob, T., and Madey, T. Mon . "Facet Stability in Oxygen-Induced Nanofaceting of Re(1231)". United States. doi:10.1021/nn700238r.
@article{osti_960143,
title = {Facet Stability in Oxygen-Induced Nanofaceting of Re(1231)},
author = {Wang,H. and Chan, A. and Chen, W. and Kaghazchi, P. and Jacob, T. and Madey, T.},
abstractNote = {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.},
doi = {10.1021/nn700238r},
journal = {ACS Nano},
number = 5,
volume = 1,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}