Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 27: Nano tubes and fibres

CPP 27.4: Talk

Tuesday, March 8, 2005, 14:45–15:00, TU C243

Thiophene nanofibers on mica — •Laxman Kankate, Frank Balzer, and Horst Niehus — Humboldt-Universität zu Berlin, Institut für Physik / ASP

Recently, we have demonstrated the dipole assisted self-assembly of para-hexaphenyl (p-6P) molecules into mutually parallel, blue-light emitting nanofibers on mica [1]. Thiophenes (α-quaterthiophene, α-4T, and α-sexithiophene, α-6T) condense into single-crystalline nanofibers on mica after vacuum sublimation, too, but with less mutual alignment. Optical properties and morphology of the nanofibers are studied by fluorescence microscopy, optical spectroscopy and atomic force microscopy. Thiophene nanofibers are mainly aligned along three different directions on the surface, whereas p-6P fibers only exhibit two different orientations. Polarized luminescence from single fibers is related to their morphological properties and compared to aggregates from other organic molecules.
1. F. Balzer and H.-G. Rubahn, Appl. Phys. Lett. 79 (2001), 3860 - 3862.