Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Organic Electronics and Photovoltaics

CPP 30.11: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Columnar axial orientation of discotic liquid crystals in nanoporous solids — •Kathrin Sentker, Katrin Knopp, and Patrick Huber — Institut für Werkstoffphysik und -technologie, Technische Universität Hamburg-Harburg

The columnar axial orientation of discotic liquid crystals (DLC) in nanoporous silica or alumina membranes provides a high electrical conductivity along the pore axis, which is important for their applications in e.g. photovoltaic devices. The optical birefringence of the DLCs is a measure of their orientational order. In contrast to a radial orientation an axial orientation causes a negative birefringence. We successfully reproduced the experimental results of Calus et al. [1], showing that 11-hexakis(hexyloxy)triphenylene DLCs embedded in an untreated alumina membrane exhibit positive birefringence, hence a radial orientation. In order to achieve axial orientation we are going to chemically modify the membranes from hydrophilic to hydrophobic. Additionally, we are going to perform measurements with coronene-based DLCs as suggested by Duran et al. [2], supplemented by X-ray diffraction experiments to probe the translational order.

[1] Sylwia Calus, Andriy V. Kityk, Patrick Huber, Microporous and Mesoporous Materials 197 (2014)

[2] Hatice Duran et al., ACS Nano 6, 11 (2012)