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Title: Morphological stability of oxygen- and nitrogen-covered Ru(112¯1)

Morphological stability of the atomically rough Ru(112¯1) surface upon annealing in NO 2, O 2, and NH 3 at elevated temperatures has been studied using scanning tunneling microscopy (STM), low energy electron diffraction (LEED), and Auger electron spectroscopy. The surface becomes fully faceted and covered by oxygen after annealing at T ≥ 600 K in NO 2 (10 –8 Torr) or O 2 (10 –6 Torr). The LEED and STM studies reveal that the faceted surface consists of nanoscale ridges, exposing four facets (101¯1), (011¯1), (101¯0), and (011¯0) on the ridges, and the ridge size grows as the annealing temperature increases. Details of the facet structures and reconstructions have been observed. However, no evidence is found for faceting of Ru(112¯1) to occur upon annealing in NH 3. As a result, our findings should be important for development of Ru-based catalysts under oxygen-rich conditions.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States)
Publication Date:
Grant/Contract Number:
FG02-93ER14331
Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 139; Journal Issue: 8; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Research Org:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; scanning tunneling microscopy; single-crystal surfaces; structure sensitivity; carbon-monoxide; shape changes; IR surfaces; oxidation; adsorption; CO; nanoparticles
OSTI Identifier:
1349423

Shen, Quantong, Chen, Wenhua, Wang, Hao, and Bartynski, Robert A. Morphological stability of oxygen- and nitrogen-covered Ru(112¯1). United States: N. p., Web. doi:10.1063/1.4819130.
Shen, Quantong, Chen, Wenhua, Wang, Hao, & Bartynski, Robert A. Morphological stability of oxygen- and nitrogen-covered Ru(112¯1). United States. doi:10.1063/1.4819130.
Shen, Quantong, Chen, Wenhua, Wang, Hao, and Bartynski, Robert A. 2013. "Morphological stability of oxygen- and nitrogen-covered Ru(112¯1)". United States. doi:10.1063/1.4819130. https://www.osti.gov/servlets/purl/1349423.
@article{osti_1349423,
title = {Morphological stability of oxygen- and nitrogen-covered Ru(112¯1)},
author = {Shen, Quantong and Chen, Wenhua and Wang, Hao and Bartynski, Robert A.},
abstractNote = {Morphological stability of the atomically rough Ru(112¯1) surface upon annealing in NO2, O2, and NH3 at elevated temperatures has been studied using scanning tunneling microscopy (STM), low energy electron diffraction (LEED), and Auger electron spectroscopy. The surface becomes fully faceted and covered by oxygen after annealing at T ≥ 600 K in NO2 (10–8 Torr) or O2 (10–6 Torr). The LEED and STM studies reveal that the faceted surface consists of nanoscale ridges, exposing four facets (101¯1), (011¯1), (101¯0), and (011¯0) on the ridges, and the ridge size grows as the annealing temperature increases. Details of the facet structures and reconstructions have been observed. However, no evidence is found for faceting of Ru(112¯1) to occur upon annealing in NH3. As a result, our findings should be important for development of Ru-based catalysts under oxygen-rich conditions.},
doi = {10.1063/1.4819130},
journal = {Journal of Chemical Physics},
number = 8,
volume = 139,
place = {United States},
year = {2013},
month = {8}
}