Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations

CPP 50.28: Poster

Wednesday, March 22, 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.