期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms14765
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资金
- German Research Foundation (DFG) through the Collaborative Research Center 'Synthetic Carbon Allotropes' [SFB 953]
- 'In-Situ Microscopy with Electrons, X-rays and Scanning Probes' [GRK 1896]
- 'Control of London Dispersion in Molecular Chemistry' [SPP 1807]
- Cluster of Excellence 'Engineering of Advanced Materials' at the Friedrich-Alexander University Erlangen-Nurnberg and the ERC Starting Grant SURFLINK [EXC 315]
- 'Solar Technologies Go Hybrid' initiative of the Free State of Bavaria and the German Fonds der Chemischen Industrie
- German Research Foundation [GE 2827/1-1]
The fabrication of nanostructures in a bottom-up approach from specific molecular precursors offers the opportunity to create tailored materials for applications in nanoelectronics. However, the formation of defect-free two-dimensional (2D) covalent networks remains a challenge, which makes it difficult to unveil their electronic structure. Here we report on the hierarchical on-surface synthesis of nearly defect-free 2D covalent architectures with carbonyl-functionalized pores on Au(111), which is investigated by low-temperature scanning tunnelling microscopy in combination with density functional theory calculations. The carbonyl-bridged triphenylamine precursors form six-membered macrocycles and one-dimensional (1D) chains as intermediates in an Ullmann-type coupling reaction that are subsequently interlinked to 2D networks. The electronic band gap is narrowed when going from the monomer to 1D and 2D surface-confined p-conjugated organic polymers comprising the same building block. The significant drop of the electronic gap from the monomer to the polymer confirms an efficient conjugation along the triphenylamine units within the nanostructures.
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