Regioselective On-Surface Synthesis of [3]Triangulene Graphene Nanoribbons
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Daugherty, Michael C. Jacobse, Peter H. Jiang, Jingwei Jornet-Somoza, Joaquim Dorit, Reis Wang, Ziyi Lu, Jiaming McCurdy, Ryan Rubio, Angel Louie, Steven G. Crommie, Michael F. Fischer, Felix R. |
| author_facet | Daugherty, Michael C. Jacobse, Peter H. Jiang, Jingwei Jornet-Somoza, Joaquim Dorit, Reis Wang, Ziyi Lu, Jiaming McCurdy, Ryan Rubio, Angel Louie, Steven G. Crommie, Michael F. Fischer, Felix R. |
| contents | The integration of low-energy states into bottom-up engineered graphene nanoribbons (GNRs) is a robust strategy for realizing materials with tailored electronic band structure for nanoelectronics. Low-energy zero-modes (ZMs) can be introduced into nanographenes (NGs) by creating an imbalance between the two sublattices of graphene. This phenomenon is exemplified by the family of [n]triangulenes. Here, we demonstrate the synthesis of [3]triangulene-GNRs, a regioregular one-dimensional (1D) chain of [3]triangulenes linked by five-membered rings. Hybridization between ZMs on adjacent [3]triangulenes leads to the emergence of a narrow band gap, Eg = 0.7 eV, and topological end states that are experimentally verified using scanning tunneling spectroscopy (STS). Tight-binding and first-principles density functional theory (DFT) calculations within the local spin density approximation (LSDA) corroborate our experimental observations. Our synthetic design takes advantage of a selective on-surface head-to-tail coupling of monomer building blocks enabling the regioselective synthesis of [3]triangulene-GNRs. Detailed ab initio theory provides insight into the mechanism of on-surface radical polymerization, revealing the pivotal role of Au-C bond formation/breakage in driving selectivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_15882 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Regioselective On-Surface Synthesis of [3]Triangulene Graphene Nanoribbons Daugherty, Michael C. Jacobse, Peter H. Jiang, Jingwei Jornet-Somoza, Joaquim Dorit, Reis Wang, Ziyi Lu, Jiaming McCurdy, Ryan Rubio, Angel Louie, Steven G. Crommie, Michael F. Fischer, Felix R. Mesoscale and Nanoscale Physics Materials Science The integration of low-energy states into bottom-up engineered graphene nanoribbons (GNRs) is a robust strategy for realizing materials with tailored electronic band structure for nanoelectronics. Low-energy zero-modes (ZMs) can be introduced into nanographenes (NGs) by creating an imbalance between the two sublattices of graphene. This phenomenon is exemplified by the family of [n]triangulenes. Here, we demonstrate the synthesis of [3]triangulene-GNRs, a regioregular one-dimensional (1D) chain of [3]triangulenes linked by five-membered rings. Hybridization between ZMs on adjacent [3]triangulenes leads to the emergence of a narrow band gap, Eg = 0.7 eV, and topological end states that are experimentally verified using scanning tunneling spectroscopy (STS). Tight-binding and first-principles density functional theory (DFT) calculations within the local spin density approximation (LSDA) corroborate our experimental observations. Our synthetic design takes advantage of a selective on-surface head-to-tail coupling of monomer building blocks enabling the regioselective synthesis of [3]triangulene-GNRs. Detailed ab initio theory provides insight into the mechanism of on-surface radical polymerization, revealing the pivotal role of Au-C bond formation/breakage in driving selectivity. |
| title | Regioselective On-Surface Synthesis of [3]Triangulene Graphene Nanoribbons |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2402.15882 |