SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Focus Session: Scanning Probe Microscopy with Quartz Sensors I
O 45.5: Talk
Wednesday, March 29, 2023, 11:45–12:00, CHE 89
Self-Assembly Study of 1,2,10,11,12,14-hexafluoropentacene on a Au(111) surface by HR-AFM — •Miguel Wiche1, Maximilian Dreher2, André Schirmeisen1, Gregor Witte2, and Daniel Ebeling1 — 1Institute of Applied Physics, Justus Liebig University Giessen, Germany — 2Fachbereich Physik, Philipps-Universität Marburg, Germany
The electronic properties of 2D organic materials highly depend on the orientation of the molecules inside the molecular thin film. For designing new materials with tailored functionality, it is important to understand the self-assembly processes of the individual molecular building blocks on surfaces. For example, the role of intermolecular halogen bonds for the molecular arrangement is not well understood. A powerful tool to investigate assembly processes in a step-by-step fashion is the bond imaging AFM method, which is based on operating qPlus sensors under UHV conditions at low temperatures with CO-functionalized tips. Here, the onset of the self-assembly process of individual partially fluorinated 1,2,10,11,12,14-hexafluoropentacene molecules on Au(111) is studied. Therefore, the molecules are first evaporated onto a cold surface (around 6K) where molecular diffusion is negligible. The formation of small clusters with closely packed molecules all facing in the same direction is induced by subsequent heating steps to temperatures up to 50K. At higher temperatures (80-300K) also larger islands form. After each heating step, the sample is cooled down to 5K for determining the precise bonding angles and length of the intermolecular F⋯H contacts via bond imaging AFM.