The (111) Surface of NaAu2. Structure, Composition, and Stability
- Iowa State Univ., Ames, IA (United States)
- Swis Federal Laboratories for Materials Science and Technology (Switzerland)
- Ames Lab., Ames, IA (United States)
- Iowa State Univ., Ames, IA (United States); Ames Lab., Ames, IA (United States)
The (111) surface of single-crystal NaAu2 is a model for catalytically active, powdered NaAu2. We prepare and characterize this surface with a broad suite of techniques. Preparation in ultrahigh vacuum consists of the traditional approach of ion bombardment (to remove impurities) and thermal annealing (to restore surface order). Both of these steps cause loss of sodium (Na), and repeated treatments eventually trigger conversion of the surface and near-surface regions to crystalline gold. The bulk has a limited ability to repopulate the surface Na. Under conditions where Na depletion is minimized, electron diffraction patterns are consistent with the bulk-terminated structure, and scanning tunneling microscopy reveals mesa-like features with lateral dimensions of a few tens of nanometers. The tops of the mesas do not possess fine structure characteristic of a periodic lattice, suggesting that the surface layer is disordered under the conditions of these experiments.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- 200021-129511, AC02-07CH11358
- OSTI ID:
- 1226909
- Report Number(s):
- IS-J 8532
- Journal Information:
- Inorganic Chemistry, Vol. 54, Issue 3; ISSN 0020-1669
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
The Influence of Charge Transfer on Ion Emission from NaAu{sub y} Film
The hydrogenolysis of ethane over Re-Pt(111) and Pt-Re(0001) bimetallic crystal surfaces