EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

High resolution AFM with CO terminated probing tip is a valuable tool to determine the structural properties of molecular assemblies. In combination with on-surface chemistry rather complex 2d networks, ribbons or nanowires can be grown. In particular, graphene nanoribbons were succssfully grown and nano-friction experiments performed [1]. In a second stage, porous N-doped GNRs were grown and characterized by AFM. STM spectroscopy and theoretical analysis indicate that the energy gap is enlarged [2]. Finally, 2d assemblies with a Kagome structure are presented. Theoretical analysis indicates the occurence of flat bands, which is promising for unconventional superconductivity and magnetism [3].

[1] S. Kawai, A. Benassi, E. Gnecco, H. Söde, R. Pawlak, X. Feng, K. Müllen, D. Passerone, C. A. Pignedoli, P. Ruffieux, R. Fasel, E. Meyer, Superlubricity of graphene nanoribbons on gold surfaces, Science, 351, (6276), (2016), 957

[2] R. Pawlak, X. Liu, S. Ninova, P. D'Astolfo, C. Drechsel, S. Sangtarash, R. Häner, S. Decurtins, H. Sadeghi, C. J. Lambert, U. Aschauer, S-X. Liu, E. Meyer, Bottom-up Synthesis of Nitrogen-Doped Porous Graphene Nanoribbons, Journal of the American Chemical Society, 142, (29), (2020), 12568-12573

[3] Rémy Pawlak, Xunshan Liu, Silviya Ninova, Philipp D’Astolfo, Carl Drechsel, Jung-Ching Liu, Robert Häner, Silvio Decurtins, Ulrich Aschauer, Shi-Xia Liu and Ernst Meyer, On-Surface Synthesis of Nitrogen-Doped Kagome Graphene, to appear in Angewandte Chemie (2021).