Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 19: Graphene: Growth, structure and substrate interaction (joint session O/HL)
HL 19.2: Talk
Tuesday, March 10, 2026, 11:00–11:15, HSZ/0201
Heterotriangulene Kagome Graphene Films: Growth and Effect of Kinetic Reaction Parameters — •Wyatt Behn1, Simon Briesenick1, Chang Wan Kang2, Manuel González-Lastre3, Pablo Pou3, Rubén Pérez3, Dmytro Perepichka2, and Peter Grutter1 — 1Dept. of Physics, McGill — 2Dept. of Chemistry, McGill — 3Universidad Autónoma de Madrid
Nanoporous graphenes featuring Kagome lattices formed by heterotriangulene units continue to attract interest for their correlated electronic properties. Their symmetry gives rise to flat bands and Dirac cones [1,2]. Covalent organic frameworks (COFs) like these are often synthesized by surface-assisted Ullmann coupling, and are susceptible to defects such as voids, irregular-sided linkages, and limited grain sizes of around 100 nm [3,4]. We perform a series of polymerizations over a range of sample temperatures (180-250 C) for tribromo- and triiodotrioxaazatriangulene precursors on the Au(111) surface. Using scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM) we interrogate how deposition conditions and choice of halogen affect the final polymer film quality, which we quantify using minimum spanning tree and persistent homology approaches. We also investigate the prevalence of halogenated edge terminations and of undesired organometallic intermediates. Experimental results are complemented by simulated STM and nc-AFM analyses. [1] C. Steiner, et al. Nat. Commun. 8, 14765 (2017). [2] G. Galeotti, et al. Nat. Mater. 19 (2020). [3] M. Lackinger, Chem. Commun. 53 7872 (2017). [4] T. Qin, et al. Commun. Chem. 7 154 (2024).
Keywords: heterotriangulene; atomic force microscopy; covalent organic frameworks; ullmann coupling; scanning tunneling microscopy