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

Journal Article · Wed Aug 28 00:00:00 EDT 2013 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4819130· OSTI ID:1349423

Shen, Quantong ^[1]; Chen, Wenhua ^[2]; Wang, Hao ^[2]; Bartynski, Robert A. ^[2]

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1. Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States); Rutgers University
2. Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States)

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.

• Research Organization: Rutgers Univ., Piscataway, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: FG02-93ER14331
• OSTI ID: 1349423
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 8 Vol. 139; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CO
IR surfaces
adsorption
carbon-monoxide
nanoparticles
oxidation
scanning tunneling microscopy
shape changes
single-crystal surfaces
structure sensitivity