Charged and metallic molecular monolayers through surface-induced aromatic stabilization
| Autor: | Jens Niederhausen, Steffen Duhm, Georg Heimel, Johannes Frisch, Raphael Schlesinger, Anna Stróżecka, Benjamin Bröker, Satoshi Kera, Jens Pflaum, Gunnar Schulze, B. Detlefs, Nobuo Ueno, Norbert Koch, Stefanie Winkler, Jose Ignacio Pascual, Ingo Salzmann, Alexander Gerlach, Christoph Bürker, Katharina J. Franke, Andreas Wilke, I. Fernandez-Torrente, Takuya Hosokai, Antje Vollmer, Frank Schreiber |
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| Rok vydání: | 2012 |
| Předmět: |
Surface (mathematics)
Models Molecular Naphthacenes Chemistry Surface Properties General Chemical Engineering Quinones Substrate (chemistry) Nanotechnology General Chemistry Surface engineering Organic semiconductor Metal Semiconductors Chemical physics Metals visual_art Monolayer visual_art.visual_art_medium Molecule Thermodynamics |
| Zdroj: | Nature chemistry. 5(3) |
| ISSN: | 1755-4349 |
| Popis: | Large π-conjugated molecules, when in contact with a metal surface, usually retain a finite electronic gap and, in this sense, stay semiconducting. In some cases, however, the metallic character of the underlying substrate is seen to extend onto the first molecular layer. Here, we develop a chemical rationale for this intriguing phenomenon. In many reported instances, we find that the conjugation length of the organic semiconductors increases significantly through the bonding of specific substituents to the metal surface and through the concomitant rehybridization of the entire backbone structure. The molecules at the interface are thus converted into different chemical species with a strongly reduced electronic gap. This mechanism of surface-induced aromatic stabilization helps molecules to overcome competing phenomena that tend to keep the metal Fermi level between their frontier orbitals. Our findings aid in the design of stable precursors for metallic molecular monolayers, and thus enable new routes for the chemical engineering of metal surfaces. |
| Databáze: | OpenAIRE |
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