Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 5: Organic Thin Films, Organic-Inorganic Interfaces
DS 5.1: Vortrag
Montag, 5. September 2022, 11:30–11:45, H17
RuTPP thin films: morphology, dimerization and CO adsorption — •Jakob Hauns1, Johannes Seibel1, Artur Böttcher1, Lukas Gerhard2, Wulf Wulfhekel2, and Manfred Kappes1 — 1Institute of Physical Chemistry, KIT, 76131 Karlsruhe, Germany — 2Institute of Nanotechnology, KIT, 76344, Eggenstein-Leopoldshafen, Germany
Thin RuTPP-2H films were grown on HOPG under UHV conditions by applying the Low Energy Cluster Beam Deposition method, LECBD [1]. We used the mass-selected (RuTPP-2H)+ beam resulting from electron impact induced ionization and fragmentation of the effusive flux of RuTPP molecules. The morphology of the films grown here were systematically studied by means of STM, UPS, XPS and desorption spectroscopy. The temperature programmed desorption (TPD) spectra, taken for sub- and multilayers enable to determine the binding energies explaining the unique stability of the films. In particular this analysis revealed the thermally activated formation of stable desorbable dimers for layers thicker than one monolayer. By combining STM and UPS we found spectral markers for the monomers and dimers deposited on HOPG. XPS/UPS based study of the CO adsorption on RuTPP-2H submonolayers revealed pronounced modifications of the valence band. These findings are supported by extensive DFT calculations which enable to identify the major CO-(RuTPP-2H) binding sites.
[1] J. Weippert, et al., J. Phys. Chem. C 2018, 122, 28588*28600