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The (111) Surface of NaAu2: Structure, Composition, and Stability
Inorganic Chemistry
  • Emma Jane Kwolek, Iowa State University
  • Roladn Widmer, Swiss Federal Laboratories for Materials Science and Technology
  • Oliver Gröning, Swiss Federal Laboratories for Materials Science and Technology
  • Okan Deniz, Swiss Federal Laboratories for Materials Science and Technology
  • Holly L. Walen, Iowa State University
  • Chad D. Yuen, Iowa State University
  • Wenyu Huang, Iowa State University
  • Deborah L. Schlagel, Ames Laboratory
  • Mark Wallingford, Ames Laboratory
  • Patricia A. Thiel, Iowa State University
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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, however, 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 bulkterminated 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.

Reprinted (adapted) wit permission from Inorganic Chemistry 54 (2015): 1159, doi: 10.1021/ic5025444. Copyright 2014 American Chemical Society.

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American Chemical society
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Emma Jane Kwolek, Roladn Widmer, Oliver Gröning, Okan Deniz, et al.. "The (111) Surface of NaAu2: Structure, Composition, and Stability" Inorganic Chemistry Vol. 54 Iss. 3 (2015) p. 1159 - 1164
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