Determination of molecular orientation in ultrathin liquid crystal. films on 
solid substrates using X-ray absorption spectroscopy

Wegner, H.; Weiss, K.; Grunze, M.; Wöll, Ch.

doi:10.1007/s003390050571

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Determination of molecular orientation in ultrathin liquid crystal. films on solid substrates using X-ray absorption spectroscopy

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Grunze, M.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Wegner, H., Weiss, K., Grunze, M., & Wöll, C. (1997). Determination of molecular orientation in ultrathin liquid crystal. films on solid substrates using X-ray absorption spectroscopy. Applied Physics A, 65(3), 231-234. doi:10.1007/s003390050571.

Cite as: https://hdl.handle.net/21.11116/0000-0001-B285-F

Abstract

H60O6, HBT) deposited on a (111)-oriented Au single crystal and a polycrystalline indium tin oxide (ITO) substrate has been carried out using X-ray absorption spectroscopy. Films of thicknesses between 2 nm and 15 nm were prepared in UHV by evaporation of HBT [which exhibits a discotic liquid crystalline (LC) bulk phase] from a Knudsen cell. Thickness and composition of the HBT films were determined using X-ray photoelectron spectroscopy (XPS). For the thinnest films with thicknesses in the monolayer regime, the orientational analysis reveals a pronounced orientation of the disc-shaped HBT molecules parallel to the Au surface. For thicker films, a significantly reduced anisotropy is observed with the molecular plane oriented more normal to the Au surface. In the case of the ITO-substrates, no significant differences were observed between different thickn esses and the average orientation of the molecular planes was predominantly normal to the surfaces, as for the thicker films on the Au substrate.