We have developed new approaches to self organize organic molecular systems into long range ordered ‘superstructures’ exhibiting novel physical properties as compared with the individual molecules. The methods make use of intermolecular interactions and substrate-film interactions which can be varied over a wide range. Mono- and multilayer preparation was done, for example, at the air/water interface by using the Langmuir-Blodgett technique using wetting instabilities, by self organizing by making use of intermolecular hydrogen bond formation of chiral systems, and Organic Molecular Beam Epitaxy (OMBE) under ultrahigh vacuum (UHV) conditions. The latter method allows us to generate in plane (A-B) structured films of molecular layers consisting from differing molecular systems. Some opto-electronic properties these systems will be discussed. Results from advanced scanning probes for the characterization of the organized systems by dynamic force spectroscopy, and a novel type of near field optical probe with nanometer resolution capability will be presented. Complementary to self organization techniques local probe techniques were applied to selectively modify the chemical nature of monolayers films and subsequent adsorption of other organic compounds, and metallic nanoclusters. In this way complex patterns could be locally generated for the investigation of electronic properties, for example, of nanowires.

References

W. C. Wang, D. Y. Zhong, J. Zhu, F. Kalischewski, R. F. Dou, K. Wedeking, Y. Wang, A. Heuer, H. Fuchs, G. Erker, and L. F. Chi; Patterned Nucleation Control in Vacuum Deposition of Organic Molecules; Phys. Rev. Lett. 98, 225504 (2007)

S. Lenhert, P. Sun, Y. Wang, H. Fuchs, C. A. Mirkin: Massively parallel dip-pen nanolithography of heterogeneous supported phospholipid multilayer patterns, Small 3, 71-75 (2007)

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