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Proceedings Paper

Self-assembly of highly rigid ferrocenyl nanostructures monitored by optical second harmonic generation
Author(s): Tobias Weidner; Andreas Kraemer; Jens Vor der Brueggen; Ulrich Siemeling; Frank Traeger
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Paper Abstract

Most compounds used for thin film formation with nanometer dimensions in the past are intrinsically "soft" due to flexible spacer units, which limit the overall film ordering. In order to resolve this problem we have synthesised compounds bearing very rigid pi-spacers to connect the 2,2’:6’,2’’-terpyridin-4’-yl head groups and redox-active ferrocenyl functional groups. Subsequently, we have prepared highly ordered nanostructured surfaces by self-assembly of these rigid ferrocenyl functionalised terpyridines. Adsorption and assembly from solution on different substrates were studied in situ by optical second harmonic generation (SHG). With this technique a signal can be generated exclusively at the interface which makes readily possible investigations of adsorption and film assembly in the submonolayer regime. The experimental data clearly show formation of monomolecular films on the substrate on a timescale of typically several minutes. This process can be described by diffusion-limited Langmuir kinetics. Most importantly, we have also found that film growth is followed by self-assembly of highly ordered ferrocenyl nanostructures on a much longer timescale. This opens the door to exploit these rigid, oriented molecules as templates for the preparation of novel structures consisting, for example, of metal nanoparticle arrays or multilayer architectures.

Paper Details

Date Published: 15 July 2004
PDF: 8 pages
Proc. SPIE 5339, Photon Processing in Microelectronics and Photonics III, (15 July 2004); doi: 10.1117/12.531530
Show Author Affiliations
Tobias Weidner, Univ. Kassel (Germany)
Andreas Kraemer, Univ. Kassel (Germany)
Center for Interdisciplinary Nanostructure Science and Technology (Germany)
Jens Vor der Brueggen, Univ. Kassel (Germany)
Center for Interdisciplinary Nanostructure Science and Technology (Germany)
Ulrich Siemeling, Univ. Kassel (Germany)
Center for Interdisciplinary Nanostructure Science and Technology (Germany)
Frank Traeger, Univ. Kassel (Germany)


Published in SPIE Proceedings Vol. 5339:
Photon Processing in Microelectronics and Photonics III
Jan J. Dubowski; David B. Geohegan; Frank Träger; Peter R. Herman; Jim Fieret; Alberto Pique; Tatsuo Okada; Friedrich G. Bachmann; Willem Hoving; Kunihiko Washio; Xianfan Xu, Editor(s)

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