Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Focus: Molecularly Functionalized Low-Dimensional Systems II - organized by Antonio Setaro, Carola Meyer, Aravind Vijayaraghvan and Matteo Mannini
CPP 12.2: Vortrag
Montag, 12. März 2018, 15:30–15:45, C 130
UHV deposition of pyrene on metal surfaces — •Sebastian Schleicher1, Bogdana Borca3, Jeff Rawson2, Frank Matthes1, Daniel E. Bürgler1, Paul Kögerler2, and Claus M. Schneider1 — 1Peter Grünberg Institut (PGI-6), Forschingszentrum Jülich — 2Institute of Inorganic Chemistry, RWTH Aachen Universität — 3National Institute of Materials Physics, Bucharest, Romania
Interfacial properties of organic adsorbates featuring aromatic π-orbitals on metal surfaces play an important role for organic electronics and spintronics. The deposition of single pyrene molecules with a size between ultimately small benzene and extended graphene on clean and reactive surfaces is challenging, since pyrene is a solid with a high vapor pressure. Hence, it cannot be evaporated from a Knudsen cell, nor dosed from the gas phase. Here, we present a sublimation procedure under UHV and image pyrene molecules on in-situ cleaned Au(111) and Fe/W(110) substrates by means of low temperature scanning tunneling microscopy (LT-STM) at 77 K. For the Au(111) surface, the molecule-surface interaction is weak such that the Au(111) herringbone reconstruction is not lifted and visible through the ordered molecular layer. Pyrene desorption self-limits growth to a monolayer due to the weak intermolecular bonding. The molecular arrangement of adsorbed pyrene on stronger interacting Fe films on W(110) sensitively depends on Fe thickness. Irregular configurations occur on the first Fe layer, while self-assembled ordered arrays form on the second, third and fourth Fe layer.