Berlin 2024 – scientific programme
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DS: Fachverband Dünne Schichten
DS 17: Organic Thin Films, Organic-Inorganic Interfaces
DS 17.5: Talk
Thursday, March 21, 2024, 16:00–16:15, A 060
Polarized Raman Imaging of para-Hexaphenylene Nanoaggregates — •Frank Balzer1, Roland Resel2, and Manuela Schiek3 — 1Mads Clausen Institute, University of Southern Denmark, Sønderborg, Denmark — 2Institute of Solid State Physics, Graz University of Technology, Graz, Austria — 3Center for Surface- and Nanoanalytics (ZONA), Johannes Kepler University, Linz, Austria
Organic molecular beam deposition of para-hexaphenylene (p6P) onto poly-crystalline platinum results in the formation of unique nanoaggregates, predominantly as nanofibers and ribbons. Atomic force microscopy reveals intricate morphological differences. Grazing incidence X-ray diffraction validates multiple crystalline contact faces, with a preference for crystallographic contact planes where molecules are oriented parallel to the substrate surface. No evidence of in-plane templating effects is observed. Uniform and varying optical extinction angles in birefringent aggregates suggest a complex aggregation process. Raman microscopy indicates that the molecular orientation within the aggregates is generally perpendicular to the long aggregate axis, aligning with the aggregate orientation. This finding is significant for applications leveraging p6P’s polarized emission properties, such as in photonic and optoelectronic devices.
Keywords: para-hexaphenylene; OMBD; nanoaggregates; Raman-microscopy