Regensburg 2004 – wissenschaftliches Programm
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SYOH: Organic and Hybrid Systems for Future Electronics
SYOH 5: Poster
SYOH 5.4: Poster
Donnerstag, 11. März 2004, 18:00–21:00, B
Self-assembly of highly rigid redox-active nanostructures monitored by optical second harmonic generation — •Tobias Weidner1, Jens Vor der Brüggen2, Andreas Krämer2, Ulrich Siemeling2, and Frank Träger1 — 1Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology - CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Institut für Chemie and Center for Interdisciplinary Nanostructure Science and Technology - CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel
We have used self-assembly techniques for the preparation of highly ordered electronically active monolayers on gold substrates. Many compounds used for self assembly at present are intrinsically flexible due to flexible spacer units thus limiting the overall film ordering. To resolve this problem we have synthesized compounds bearing highly rigid π-spacers and 2,2′:6′,2″-terpyridin-4′-yl or tripodal tris[(methylthio)methyl]silyl headgroups, adding to the rigidity of the obtained films. These molecules have been functionalised with phenyl and ferrocenyl groups. Ferrocene is a redox-active organometallic unit which is widely used for sensoric and electronic applications. Adsorption from solution was studied in situ by optical second harmonic generation (SHG) with submonolayer resolution. SHG was also used to examine film ordering in real time. The results have been compared to ellipsometric measurements. The data show that adsorption leads to the formation of monomolecular films at the interface. We found that film growth is followed by self-assembly of highly ordered redox-active ferrocenyl nanostructures.