AVS 53rd International Symposium
    Surface Science Tuesday Sessions
       Session SS1-TuA

Paper SS1-TuA5
Sub-monolayer Sn/Cu(001) and Sn/Si/Cu(001) Structures

Tuesday, November 14, 2006, 3:20 pm, Room 2002

Session: Surface Structure and Morphology
Presenter: B.J. Hinch, Rutgers University
Authors: J. Lallo, Rutgers University
L.V. Goncharova, Rutgers University
B.J. Hinch, Rutgers University
S. Rangan, Rutgers University
R.A. Bartynski, Rutgers University
D. Strongin, Temple University
Correspondent: Click to Email
Studies of Sn metal films on copper have been undertaken, as part of a wider program in understanding the thermal stability of Sn, and Sn with Si, films on copper surfaces. This STM investigation is motivated by the promoter effects of Sn in dichloro-dimethyl-silane production from Si/Cu catalysts. Four periodic superstructures, with sub-monolayer tin films grown at room temperature, have been seen with LEED. Comparatively recently, helium atom scattering (HAS) studies@footnote 1@ have also identified a 5@super th@ room temperature phase. While one STM identified phase has been previously reported,@footnote 2@ in this presentation we will show images of each of the known phases, and of surfaces supporting co-existing phases. Auger Electron Spectroscopy (AES) is used to establish relative Sn coverages, and to correlate the STM images with previously reported LEED and He diffraction data. We propose atomic structures for each of the stable room temperature Sn/Cu(001) phases. We also report on the thermal stability of these phases. At least one additional phase is produced only on annealing to 450K. Finally we present data on an ordered ternary Sn /Si /Cu(001) phase, and discuss the thermal stability of this phase also. @FootnoteText@ @footnote 1@L. Goncharova, Ph.D. Thesis, May 2003, Chemistry; Rutgers, The State University of New Jersey.@footnote 2@A.A. Cafolla, E. McLoughlin, Surface Science 544 (2003) 121-133.