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

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.4819130 · OSTI ID:1349423
 [1];  [2];  [2];  [2]
  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)Copyright Statement
Country of Publication:
United States
Language:
English