1. Ultrahigh-yield on-surface synthesis and assembly of circumcoronene into a chiral electronic Kagome-honeycomb lattice
- Author
-
Xinnan Peng, Shaotang Song, Mykola Telychko, Guangwu Li, Pavel Jelínek, Diego Soler-Polo, Jie Su, Pingo Mutombo, Jishan Wu, Jiong Lu, Ming Joo Koh, Mark T. Edmonds, and UAM. Departamento de Física Teórica de la Materia Condensada
- Subjects
Materials science ,Nanographenes ,Tight-Binding Calculations ,Superlattice ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,High Yield ,Scanning probe microscopy ,Honeycomb ,Molecule ,Topology (chemistry) ,Research Articles ,Cascade Reactions ,Multidisciplinary ,Metallic Surface ,Self Organizations ,SciAdv r-articles ,Física ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Methyl Radical ,Zigzag ,Chemical physics ,Intramolecular force ,Density functional theory ,0210 nano-technology ,Research Article ,Surface Chemistry ,Honeycomb Lattices - Abstract
Bottom-up surface-assisted synthesis of circumcoronene self-assembly enables realization of artificial electronic lattice., On-surface synthesis has revealed remarkable potential in the fabrication of atomically precise nanographenes. However, surface-assisted synthesis often involves multiple-step cascade reactions with competing pathways, leading to a limited yield of target nanographene products. Here, we devise a strategy for the ultrahigh-yield synthesis of circumcoronene molecules on Cu(111) via surface-assisted intramolecular dehydrogenation of the rationally designed precursor, followed by methyl radical-radical coupling and aromatization. An elegant electrostatic interaction between circumcoronenes and metallic surface drives their self-organization into an extended superlattice, as revealed by bond-resolved scanning probe microscopy measurements. Density functional theory and tight-binding calculations reveal that unique hexagonal zigzag topology of circumcoronenes, along with their periodic electrostatic landscape, confines two-dimensional electron gas in Cu(111) into a chiral electronic Kagome-honeycomb lattice with two emergent electronic flat bands. Our findings open up a new route for the high-yield fabrication of elusive nanographenes with zigzag topologies and their superlattices with possible nontrivial electronic properties.
- Published
- 2021