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O: Fachverband Oberflächenphysik

O 65: Poster: Molecular Nanostructures on Surfaces

O 65.12: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

On-Surface Synthesis of Carbon Nanoribbons with Nonalternant Topologies — •Dong Han¹, Konstantin Y. Amsharov^2,3, and J. Michael Gottfried¹ — ¹Department of Chemistry, Philipps-Universität Marburg, Marburg, Germany — ²Institute of Chemistry, Organic Chemistry, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany — ³Department of Chemistry and Pharmacy, Institute of Organic Chemistry II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

The graphene-based nanostructures embedded with nonhexagonal rings potentially exhibit exotic (opto-)electronic properties. However, their experimental realization remains rather challenging. Here we report the on-surface synthesis of carbon nanoribbons with several nonalternant topologies, including zigzag-shaped nanoribbon bearing 5-6-7 membered rings (dominant product) and porous nanoribbon, by lateral fusion of polyindeno[2,1-a]fluorene polymer chains on Au(111). The yield of nanoribbons is enhanced by successive molecular deposition to increase the coverage of polymer chains. The polymer chains originate from the Ullmann coupling of halogenated precursors and subsequent cyclodefluorination. The reaction species are scrutinized by scanning probe microscopy (SPM). X-ray photoelectron spectroscopy (XPS) is utilized to track the reaction process. This work demonstrates the versatility of lateral fusion in fabricating unusual carbon nanomaterials.

Keywords: on-surface synthesis; carbon nanoribbons; lateral fusion; scanning probe microscopy