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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. Himpsel11Physics 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.

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DPG-Physik > DPG-Verhandlungen > 1999 > Münster