Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures II
O 23.3: Talk
Tuesday, March 13, 2018, 11:15–11:30, MA 004
On-surface synthesis and characterization of atomic carbon wires — •Qiang Sun1,2, Shiyong Wang1, Wei Xu2, Pascal Ruffieux1, and Roman Fasel1 — 1Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland — 2Interdisciplinary Materials Research Center, College of Materials Science and Engineering, Tongji University, Shanghai 201804, P. R. China
Carbon-based materials have received tremendous attention, fueled by successive discoveries of novel carbon allotropes such as fullerenes, carbon nanotubes, and graphene. Among others, linear chains of carbon atoms combine ultimately simple structures with intriguing properties. For instance, polyacetylene (PA) is the sp2 hybridized one-dimensional hydrocarbon chain. Owing to its simple chemical structure and exceptional electronic properties, PA is an ideal model system for understanding the nature of conducting polymers. Inspired by recent advances in the on-surface synthesis, we aim here at the synthesis of atomic carbon chains by the surface-assisted coupling of ethyne molecule (the simplest alkyne with two terminal alkynyl groups). Here, we report a successful on-surface synthesis of metalated carbyne chains by dehydrogenative coupling of ethyne molecules and copper atoms on a Cu(110) surface, which is characterized by high resolution STM, nc-AFM, and XPS combined with DFT calculations. Moreover, we have formed both cis and trans PA oligomers on the surface and investigated the electronic properties of trans PA chains through STS and ARPES measurements.