TY - JOUR
T1 - Oxidation of Au on vicinal W(110)
T2 - Role of step edges and facets
AU - Varykhalov, A.
AU - Rader, O.
AU - Adamchuk, V. K.
AU - Gudat, W.
AU - Koel, B. E.
AU - Shikin, A. M.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2007/5/11
Y1 - 2007/5/11
N2 - The electronic and chemical properties of Au on stepped surface oxides are of great fundamental and practical interest. Vicinal W(110) substrates have been used as templates for deposition and oxidation of submonolayer amounts of Au. Crystal surfaces of flat W(110), W(145) with the densest step edges, and W(331) and W(551) with open step edges were employed as model systems. By photoemission from the 4f core levels of Au and W, the most dramatic changes to the ionic state of the Au, resulting in complete oxidation, were observed on preoxidized W(331) and W(551) after annealing at 900 K. By scanning tunneling microscopy, it was found that chemisorption of oxygen causes nanofaceting of the vicinal W(110) surfaces. The impact of the facets on the surface chemistry revealed by the experiment is discussed. The dimensions and periodicity of the facets were found to be a principal factor in Au oxidation.
AB - The electronic and chemical properties of Au on stepped surface oxides are of great fundamental and practical interest. Vicinal W(110) substrates have been used as templates for deposition and oxidation of submonolayer amounts of Au. Crystal surfaces of flat W(110), W(145) with the densest step edges, and W(331) and W(551) with open step edges were employed as model systems. By photoemission from the 4f core levels of Au and W, the most dramatic changes to the ionic state of the Au, resulting in complete oxidation, were observed on preoxidized W(331) and W(551) after annealing at 900 K. By scanning tunneling microscopy, it was found that chemisorption of oxygen causes nanofaceting of the vicinal W(110) surfaces. The impact of the facets on the surface chemistry revealed by the experiment is discussed. The dimensions and periodicity of the facets were found to be a principal factor in Au oxidation.
UR - http://www.scopus.com/inward/record.url?scp=34347342755&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34347342755&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.75.205417
DO - 10.1103/PhysRevB.75.205417
M3 - Article
AN - SCOPUS:34347342755
SN - 1098-0121
VL - 75
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 20
M1 - 205417
ER -