Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Graphene II: Excitations and Nanoribbons (joint session O/TT)

O 14.9: Vortrag

Montag, 1. April 2019, 17:00–17:15, H24

Bottom-up fabrication of porous carbon nanoribbons on metal surfaces — •Mirunalini Devarajulu, Martin Haller, Maximilian Ammon, Min-Ken Li, Shadi Sorayya, and Sabine Maier — Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

On-surface synthesis is a versatile technique to fabricate graphene-based nanoribbons from the bottom-up with high precision. We demonstrated that one-dimensional carbon nanoribbons with periodic hexagonal nanopores can be fabricated via Ullmann-type reactions on Ag(111) in combination with dehydrogenation reactions and the preprogrammed isomerization of the conformationally flexible precursor.[1] Here, we unveil the reaction mechanism and the N-doping of the porous nanoribbons in a low-temperature scanning tunneling microscopy study. We show that the rotation of m-phenylene units is a powerful design tool to promote structural control in the synthesis of porous covalent organic nanostructures on different metal surfaces. We find that the fabrication of porous nanoribbons proceeds on different terminations of the silver surface. However, the N-doping via triazine moieties influences the conformational selectivity of the molecular precursor, which affects the nanoribbon formation.

[1] M. Ammon, T. Sander, S. Maier, JACS, 2017, 139 (37), 12976