Self-assembly of highly rigid ferrocenyl nanostructures monitored by optical second harmonic generation

Tobias Weidner; Andreas Kraemer; Jens Vor der Brueggen; Ulrich Siemeling; Frank Traeger

doi:10.1117/12.531530

15 July 2004 Self-assembly of highly rigid ferrocenyl nanostructures monitored by optical second harmonic generation

Tobias Weidner, Andreas Kraemer, Jens Vor der Brueggen, Ulrich Siemeling, Frank Traeger

Proceedings Volume 5339, Photon Processing in Microelectronics and Photonics III; (2004) https://doi.org/10.1117/12.531530
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

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.

Citation Download Citation

Tobias Weidner, Andreas Kraemer, Jens Vor der Brueggen, Ulrich Siemeling, and Frank Traeger "Self-assembly of highly rigid ferrocenyl nanostructures monitored by optical second harmonic generation", Proc. SPIE 5339, Photon Processing in Microelectronics and Photonics III, (15 July 2004); https://doi.org/10.1117/12.531530

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