Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 10: New Methods and Developments II: Scanning Probe, Spectroscopic, and Diffraction Techniques

O 10.11: Vortrag

Montag, 1. April 2019, 17:30–17:45, H3

Graphene-Enhanced Raman Spectroscopy of CoOEP molecules — •Simon Rauls, Stephan Sleziona, Tobias Foller, Leonhard Christen, Phillip Ernst und Marika Schleberger — Universität Duisburg-Essen, AG Schleberger, Germany

Graphene-enhanced Raman spectroscopy (GERS) has been shown to be a powerful tool for ultra-sensitive detection of adsorbed molecules [1]. As a possible mechanism charge transfer is often suggested, which depends on the Fermi-level of the graphene, the HOMO-LUMO levels of the molecules and the excitation laser energy [2, 3]. Therefore, a combination of changing the fermi level in a graphene-based field effect device (GFET) and the excitation laser energy is tempting. To exploit this approach several methods have to be combined: (i) preparation of the GFET by photolithography, (ii) controlled deposition of molecules and characterization by measuring the interplay of the transport characteristics and Raman spectra of (iii) the pristine device and (iv) after deposition of molecules. We will present first results from evaporated Cobalt Octaethylporphyrin (CoOEP). This system allows to investigate if the magnetic properties of the molecule may be manipulated with the help of the GFET through Coulomb or quantum mechanical coupling [4].

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