Long and isolated graphene nanoribbons by on-surface polymerization on Au(111)
Abstract Low electronic gap graphene nanoribbons (GNRs) are used for the fabrication of nanomaterial-based devices and, when isolated, for mono-molecular electronics experiences, for which a well-controlled length is crucial. Here, an on-surface chemistry protocol is monitored for producing long and...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-12-01
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| Series: | Communications Chemistry |
| Online Access: | https://doi.org/10.1038/s42004-023-01073-3 |
| _version_ | 1797398180360355840 |
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| author | Umamahesh Thupakula We-Hyo Soe Christian Joachim Erik Dujardin |
| author_facet | Umamahesh Thupakula We-Hyo Soe Christian Joachim Erik Dujardin |
| author_sort | Umamahesh Thupakula |
| collection | DOAJ |
| description | Abstract Low electronic gap graphene nanoribbons (GNRs) are used for the fabrication of nanomaterial-based devices and, when isolated, for mono-molecular electronics experiences, for which a well-controlled length is crucial. Here, an on-surface chemistry protocol is monitored for producing long and well-isolated GNR molecular wires on an Au(111) surface. The two-step Ullmann coupling reaction is sequenced in temperature from 100 °C to 350 °C by steps of 50 °C, returning at room temperature between each step and remaining in ultrahigh vacuum conditions. After the first annealing step at 100 °C, the monomers self-organize into 2-monolayered nano-islands. Next, the Ullmann coupling reaction takes place in both 1st and 2nd layers of those nano-islands. The nano-island lateral size and shape are controlling the final GNR lengths. Respecting the above on-surface chemistry protocol, an optimal initial monomer coverage of ~1.5 monolayer produces isolated GNRs with a final length distribution reaching up to 50 nm and a low surface coverage of ~0.4 monolayer suitable for single molecule experiments. |
| first_indexed | 2024-03-09T01:21:02Z |
| format | Article |
| id | doaj.art-f54d1ff6e06244a38bfe652d1bd26dd9 |
| institution | Directory Open Access Journal |
| issn | 2399-3669 |
| language | English |
| last_indexed | 2024-03-09T01:21:02Z |
| publishDate | 2023-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Chemistry |
| spelling | doaj.art-f54d1ff6e06244a38bfe652d1bd26dd92023-12-10T12:10:05ZengNature PortfolioCommunications Chemistry2399-36692023-12-01611810.1038/s42004-023-01073-3Long and isolated graphene nanoribbons by on-surface polymerization on Au(111)Umamahesh Thupakula0We-Hyo Soe1Christian Joachim2Erik Dujardin3Centre d’Élaboration de Matériaux et d’Études Structurales (CEMES), Centre National de la Recherche Scientifique (CNRS), Université de ToulouseCentre d’Élaboration de Matériaux et d’Études Structurales (CEMES), Centre National de la Recherche Scientifique (CNRS), Université de ToulouseCentre d’Élaboration de Matériaux et d’Études Structurales (CEMES), Centre National de la Recherche Scientifique (CNRS), Université de ToulouseCentre d’Élaboration de Matériaux et d’Études Structurales (CEMES), Centre National de la Recherche Scientifique (CNRS), Université de ToulouseAbstract Low electronic gap graphene nanoribbons (GNRs) are used for the fabrication of nanomaterial-based devices and, when isolated, for mono-molecular electronics experiences, for which a well-controlled length is crucial. Here, an on-surface chemistry protocol is monitored for producing long and well-isolated GNR molecular wires on an Au(111) surface. The two-step Ullmann coupling reaction is sequenced in temperature from 100 °C to 350 °C by steps of 50 °C, returning at room temperature between each step and remaining in ultrahigh vacuum conditions. After the first annealing step at 100 °C, the monomers self-organize into 2-monolayered nano-islands. Next, the Ullmann coupling reaction takes place in both 1st and 2nd layers of those nano-islands. The nano-island lateral size and shape are controlling the final GNR lengths. Respecting the above on-surface chemistry protocol, an optimal initial monomer coverage of ~1.5 monolayer produces isolated GNRs with a final length distribution reaching up to 50 nm and a low surface coverage of ~0.4 monolayer suitable for single molecule experiments.https://doi.org/10.1038/s42004-023-01073-3 |
| spellingShingle | Umamahesh Thupakula We-Hyo Soe Christian Joachim Erik Dujardin Long and isolated graphene nanoribbons by on-surface polymerization on Au(111) Communications Chemistry |
| title | Long and isolated graphene nanoribbons by on-surface polymerization on Au(111) |
| title_full | Long and isolated graphene nanoribbons by on-surface polymerization on Au(111) |
| title_fullStr | Long and isolated graphene nanoribbons by on-surface polymerization on Au(111) |
| title_full_unstemmed | Long and isolated graphene nanoribbons by on-surface polymerization on Au(111) |
| title_short | Long and isolated graphene nanoribbons by on-surface polymerization on Au(111) |
| title_sort | long and isolated graphene nanoribbons by on surface polymerization on au 111 |
| url | https://doi.org/10.1038/s42004-023-01073-3 |
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