Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 35: Organic thin films III: Monolayers and crystals
DS 35.5: Vortrag
Donnerstag, 29. März 2012, 18:45–19:00, H 2032
Nanoscale assembly, morphology and screening effects in nanorods of newly synthesized substituted pentacenes — •Maria Benedetta Casu1, Sabine-Antonia Savu1, Simon Schundelmeier1, Sabine Abb1, Christina Tönshoff2, Holger F. Bettinger2, and Thomas Chassé1 — 1Institute of Physical and Theoretical Chemistry, University of Tübingen, Tübingen, Germany — 2Institute of Organic Chemistry, University of Tübingen, Tübingen, Germany
We have investigated nanorods of two newly synthesized substituted pentacenes deposited on Au(111): δ4-substituted (2,3-X2-9,10-Y2) pentacene with X = Y = methoxy group and X = Fluorine, Y = methoxy, by using X-ray photoemission spectroscopy (XPS) and atomic force microscopy (AFM). Energy dependent photoemission spectra show complex features that we have analyzed in detail by using a fitting procedure. Our analysis reveals the unusual presence of surface core level shifts due to the high electronegativity of the fluorine atoms and the structure of the nanorods. In addition, the distinctive features of growth and morphology of the nanorods are subjected to a template effect by the substrate lattice geometry, leading to a systematic organization of the nanorod assemblies.