Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.48: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
STM study of the structure and morphology of TiO2 thin films epitaxially grown on Re(1010) — •Sebastian Schwede, Susanne Schubert, Wilhelmine Kudernatsch, and Klaus Christmann — FU-Berlin, Berlin, Germany
We have studied the epitaxy of TiO2 (rutile) films grown on the oxygen precovered rhenium(1010) surface using LEED and STM. These rutile films provide, by varying their thickness systematically, an easy method to generate model catalysts with a well-defined roughness.
As a first step, we prepared the well-known (1x3) oxygen superstructure on the Re surface [1], which provides an appropriate template for the subsequent growth of the (2x1) reconstructed rutile(011) phase on the Re(1010) surface. STM images taken from the (1x3)-2O structure confirm that it is a reconstructed phase of the ’buckling’ type.
Atomically resolved STM images of the rutile films prepared according to ref. [2] reveal a clear zig-zag structure of the TiO2 films and thus confirm their glide mirror symmetry, whereby periodic intensity protrusions in the images provide additional structural information. Larger scale images also support our previous conclusions concerning the growth mechanism and morphology of the (011) rutile films.
[1] J. Lenz et al., Surf. Sci. 269/270 (1992) 410
[2] D. Rosenthal et al., Surf. Sci. 600 (2006) 2830.