Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 62: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation III
O 62.3: Vortrag
Mittwoch, 19. März 2025, 11:00–11:15, H24
On-surface synthesis and characterization of polyynic carbon chains — •Wenze Gao1,2, Wei Zheng1, Luye Sun1, Faming Kang1, Zheng Zhou1, and Wei Xu1 — 1Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University, Shanghai, China — 2Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
Carbyne, an elusive sp-hybridized linear carbon allotrope, has fascinated chemists and physicists for decades. Due to its high chemical reactivity and extreme instability, carbyne was much less explored in contrast to the sp2-hybridized carbon allotropes such as graphene. Herein, we report the on-surface synthesis of polyynic carbon chains by demetallization of organometallic polyynes on the Au(111) surface; the longest one observed consists of 60 alkyne units (120 carbon atoms). The polyynic structure of carbon chains with alternating triple and single bonds was unambiguously revealed by bond-resolved atomic force microscopy. Moreover, an atomically precise polyyne, C14, was successfully produced via tip-induced dehalogenation and ring-opening of the decachloroanthracene molecule (C14Cl10) on a bilayer NaCl/Au(111) surface at 4.7 K, and a band gap of 5.8 eV was measured by scanning tunnelling spectroscopy, in a good agreement with the theoretical HOMO-LUMO gap (5.48 eV).
Keywords: polyyne; scanning probe microscopy; carbon allotrope; on-surface synthesis; organometallic polyyne