Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations
CPP 50.28: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Fabrication of organic nanowires by melt infiltration of a discotic liquid crystal: A combined X-ray diffraction and optical birefringence study — •Kathrin Sentker1, Arda Yildirim2, Andreas Schönhals2, and Patrick Huber1 — 1Institut für Werkstoffphysik und -technologie, Technische Universität Hamburg-Harburg — 2Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin
Discotic liquid crystals (DLC) can exhibit a liquid crystalline phase with their molecules oriented along one specific direction forming hexagonal arranged columns. Embedded in nanoporous membranes the columns orient perpendicular (radially) or parallel (axially) with respect to the pore axis. Due to their hydrophilic nature porous membranes enforce face-on anchoring leading to a radial orientation. Axially oriented columns ensure high conductivity in the stacking direction due to overlapping pi - electrons yielding interesting applications in e.g. organic semiconductor-based devices. Optical birefringence measurements show that we successfully realized an axial orientation by embedding the DLC HAT6 in an alumina membrane with a pore size of 25 nm. We suspect that anions introduced into the membrane lattice from the manufacturing process react with the DLCs changing the anchoring condition of the membrane. This enforces edge-on-orientation leading to an axial orientation of columns. XRD experiments giving detailed information about the translational order support the findings from optical measurements.