Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Nanostructures at Surfaces 1
O 6.5: Vortrag
Montag, 5. September 2022, 11:30–11:45, S052
Carbon-carbon coupling on inert surfaces via a radical deposition source - proof-of-concept, challenges and perspective — •Gianluca Galeotti1 and Markus Lackinger1,2 — 1Deutsches Museum, Museumsinsel 1, 80538 Munich, Germany — 2Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
The realization of one-atom thin C-C-bonded nanostructures is an ongoing challenge of nanotechnology. Those are, however, almost exclusively synthesized on metal surfaces, taking advantage of the catalytic activity to lower the required temperature for monomer activation below the desorption threshold. The development of methods for the direct synthesis on inert and insulating surfaces would be a milestone in the field, enabling studies of nearly unperturbed covalent nanostructures with unique electronic properties, such as graphene nanoribbons and-conjugated 2D polymers. Here, we will describe the development of a Radical Deposition Source (RaDeS) for the direct deposition of radicals onto inert surfaces for subsequent coupling into C-C bonded polymers. The radicals are generated en route by indirect deposition of halogenated precursors through a heated reactive tube, where the dehalogenation reaction proceeds. As a model system for inert surfaces, we use Ag(111) passivated with a closed monolayer of chemisorbed iodine. We will first illustrate the proof-of-concept with the synthesis of poly-para-phenylene from iodinated terphenyl precursors. Subsequently, we show how this approach can be used to overcome limitations of the conventional on-surface synthesis imposed by desorption, opening additional pathways for the synthesis of nanostructures.