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O: Fachverband Oberflächenphysik

O 6: Organic Molecules on Inorganic Substrates I: Adsorption & Growth

O 6.5: Vortrag

Montag, 18. März 2024, 11:30–11:45, MA 042

On-surface synthesis of well-aligned pentacene arrays and graphdiyne nanowires on 1D-patterned VSe2 — •Zhongliu Liu¹, Ignacio Piquero-Zulaica¹, Harald Brune², and Johannes Barth¹ — ¹Physics Department E20, Technical University of Munich, Germany — ²Institute of Physics, EPF Lausanne, Switzerland

On-surface synthesis of one-dimensional (1D) polymers is a promising method for creating well-ordered nanostructures, such as graphene nanoribbons and graphdiyne nanowires. Vanadium diselenide (VSe2), as a versatile member from the transition-metal-dichalcogenide family, not only exhibits unique characteristics like ferromagnetism and excellent electrocatalysis, but also presents a unique 1D-patterned structure upon annealing. The pertaining 1D patterns of Se-deficient furrows could influence the positioning of adsorbed molecules and modify their electronic structure, guiding the on-surface synthesis of new organic entities. Here, we present the formation of oriented arrays of pentacene and diethynyl-terphenyl (DETP) 1D polymers on 1D-patterned VSe2. Pentacene arraying along the substrate pattern exhibits a reduced bandgap of approximately 1.60 eV. And for DETP arrangements on the 1D pattern, upon annealing, homocoupling reactions of terminal alkyne tectons entail the formation of oriented nanowires, some of which extend up to 30 molecular units in length. The resulting graphdiyne nanowires show a small energy shift in their HOMO. These findings highlight 1D-patterned VSe2 as a template for modulating the structural and electronic properties of organic molecules, providing a new approach for on-surface synthesis of organic polymers.

Keywords: VSe2; one-dimensional pattern; organic polymer; template effect; on-surface synthesis