Münster 1999 – wissenschaftliches Programm
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O: Oberflächenphysik
O 22: Nanostrukturen
O 22.10: Vortrag
Mittwoch, 24. März 1999, 16:45–17:00, S1
Selective adsorption of organic molecules on nano-patterned silicon — •H. Rauscher1, T. A. Jung2, A. Kirakosian1, J.-L. Lin1, K. Müllen3, and F. J. Himpsel1 — 1Physics Department, Univ. of Wisconsin-Madison, USA — 2Paul-Scherrer-Institute, Switzerland — 3Max-Planck-Institute for Polymer Research, Germany
In search of a method for fabrication of tailored one-dimensional
nanostructures we have studied the selective adsorption of
3,10-di(propyl)perylene (DPP) molecules on nano-patterned Si(111)
surfaces with a self-organized calcium fluoride overlayer as
mask. These molecules exhibit distinct reactivities with the
initial overlayer (CaF1) and the second overlayer
(CaF2). Scanning tunneling microscopy shows that reactivity
of DPP is much higher on CaF1 as compared to CaF2.
The molecules can be adsorbed preferentially on CaF1
nanostripes produced by self-assembly on stepped Si(111).
This produces large arrays of parallel molecular nanowires with
a width in the 1-15 nm range. We discuss the selectivity in
terms of a mechanism where the HOMO and LUMO of the molecule
interact with the valence band and conduction band of CaF1
and CaF2, determined directly by scanning tunneling
spectroscopy.
Supported by NSF under Award Nos. DMR-9624753 and DMR-9632527.