On-Surface Synthesis of Nanographenes and Graphene Nanoribbons on Titanium Dioxide
The article describes the formation of two types of nanographenes from custom designed and synthesized molecular precursors, through thermally induced intramolecular cyclodehydrogenation reactions on the semiconducting TiO2(110)-(1×1) surface. The obtention of the nanographenes was confirmed by the...
| Autores: | , , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Recursos: | Universidad de Santiago de Compostela (USC) |
| Repositorio: | Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela |
| Idioma: | inglés |
| OAI Identifier: | oai:minerva.usc.gal:10347/45555 |
| Acesso em linha: | https://hdl.handle.net/10347/45555 |
| Access Level: | acceso abierto |
| Palavra-chave: | titanium dioxide nanographene graphene nanoribbon on-surface synthesis cyclodehydrogenation 2306 Química orgánica 2211 Física del estado sólido |
| Resumo: | The article describes the formation of two types of nanographenes from custom designed and synthesized molecular precursors, through thermally induced intramolecular cyclodehydrogenation reactions on the semiconducting TiO2(110)-(1×1) surface. The obtention of the nanographenes was confirmed by the combination of high-resolution scanning tunneling microscopy (STM) and spectroscopy (STS) measurements, and corroborated by theoretical modeling. The application of this protocol on differently shaped molecular precursors demonstrates the ability to induce a highly efficient planarization reaction both within strained pentahelicenes as well as between vicinal phenyl rings. Additionally, by the combination of successive Ullmann-type polymerization and cyclodehydrogenation reactions, the archetypic 7-armchair graphene nanoribbons (7-AGNRs) have also been fabricated on the titanium dioxide surface from the standard 10,10′-dibromo-9,9′-bianthryl (DBBA) molecular precursors. These examples of the effective cyclodehydrogenative planarization processes provide perspectives for the rational design and synthesis of molecular nanostructures on semiconductors |
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