Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 62: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation III
O 62.6: Talk
Wednesday, March 19, 2025, 12:00–12:15, H24
On-Surface Synthesis of Hydrogen-Substituted γ-Graphdiyne with High Efficiency — •Faming Kang1,3, Wei Zheng1, Luye Sun1, Wenze Gao1, Lina Shang1, Lifeng Chi2, and Wei Xu1 — 1Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University, 201804 Shanghai, China — 2Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 215123 Suzhou, China — 3Department of Chemistry, University of Marburg, 35032 Marburg, Germany
Graphyne-family structures, a group of hybrid carbon allotropes with sp- and sp2-hybridized carbon atoms, are expected to have unique features, including a natural direct bandgap, unlike graphene. Here, we developed and synthesized precursors with one and three tribromoethenyl groups. In mild conditions, metal-free dimer and network (HsGDY) products were synthesized in big scale and good quality. The geometric structure of synthesized dimer and network products was accurately characterized by scanning tunneling microscopy and non-contact atomic force microscopy. The electronic structures of produced hydrogen-substituted graphdiyne were studied using DFT calculations. Our research may motivate theoretical and experimental efforts to create more sensitive two-dimensional carbon nanostructures with sp-hybridized carbon atoms.
Keywords: scanning probe microscopy; on-surface synthesis; γ-graphdiyne; hydrogen-substituted γ-graphdiyne; electronic structures