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Resolving metal-molecule interfaces at single-molecule junctions
Electronic and structural detail at the electrode-molecule interface have a significant influence on charge transport across molecular junctions. Despite the decisive role of the metal-molecule interface, a complete electronic and structural characterization of the interface remains a challenge. Thi...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4879565/ https://www.ncbi.nlm.nih.gov/pubmed/27221947 http://dx.doi.org/10.1038/srep26606 |
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author | Komoto, Yuki Fujii, Shintaro Nakamura, Hisao Tada, Tomofumi Nishino, Tomoaki Kiguchi, Manabu |
author_facet | Komoto, Yuki Fujii, Shintaro Nakamura, Hisao Tada, Tomofumi Nishino, Tomoaki Kiguchi, Manabu |
author_sort | Komoto, Yuki |
collection | PubMed |
description | Electronic and structural detail at the electrode-molecule interface have a significant influence on charge transport across molecular junctions. Despite the decisive role of the metal-molecule interface, a complete electronic and structural characterization of the interface remains a challenge. This is in no small part due to current experimental limitations. Here, we present a comprehensive approach to obtain a detailed description of the metal-molecule interface in single-molecule junctions, based on current-voltage (I-V) measurements. Contrary to conventional conductance studies, this I-V approach provides a correlated statistical description of both, the degree of electronic coupling across the metal-molecule interface, and the energy alignment between the conduction orbital and the Fermi level of the electrode. This exhaustive statistical approach was employed to study single-molecule junctions of 1,4-benzenediamine (BDA), 1,4-butanediamine (C4DA), and 1,4-benzenedithiol (BDT). A single interfacial configuration was observed for both BDA and C4DA junctions, while three different interfacial arrangements were resolved for BDT. This multiplicity is due to different molecular adsorption sites on the Au surface namely on-top, hollow, and bridge. Furthermore, C4DA junctions present a fluctuating I-V curve arising from the greater conformational freedom of the saturated alkyl chain, in sharp contrast with the rigid aromatic backbone of both BDA and BDT. |
format | Online Article Text |
id | pubmed-4879565 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-48795652016-06-07 Resolving metal-molecule interfaces at single-molecule junctions Komoto, Yuki Fujii, Shintaro Nakamura, Hisao Tada, Tomofumi Nishino, Tomoaki Kiguchi, Manabu Sci Rep Article Electronic and structural detail at the electrode-molecule interface have a significant influence on charge transport across molecular junctions. Despite the decisive role of the metal-molecule interface, a complete electronic and structural characterization of the interface remains a challenge. This is in no small part due to current experimental limitations. Here, we present a comprehensive approach to obtain a detailed description of the metal-molecule interface in single-molecule junctions, based on current-voltage (I-V) measurements. Contrary to conventional conductance studies, this I-V approach provides a correlated statistical description of both, the degree of electronic coupling across the metal-molecule interface, and the energy alignment between the conduction orbital and the Fermi level of the electrode. This exhaustive statistical approach was employed to study single-molecule junctions of 1,4-benzenediamine (BDA), 1,4-butanediamine (C4DA), and 1,4-benzenedithiol (BDT). A single interfacial configuration was observed for both BDA and C4DA junctions, while three different interfacial arrangements were resolved for BDT. This multiplicity is due to different molecular adsorption sites on the Au surface namely on-top, hollow, and bridge. Furthermore, C4DA junctions present a fluctuating I-V curve arising from the greater conformational freedom of the saturated alkyl chain, in sharp contrast with the rigid aromatic backbone of both BDA and BDT. Nature Publishing Group 2016-05-25 /pmc/articles/PMC4879565/ /pubmed/27221947 http://dx.doi.org/10.1038/srep26606 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Komoto, Yuki Fujii, Shintaro Nakamura, Hisao Tada, Tomofumi Nishino, Tomoaki Kiguchi, Manabu Resolving metal-molecule interfaces at single-molecule junctions |
title | Resolving metal-molecule interfaces at single-molecule junctions |
title_full | Resolving metal-molecule interfaces at single-molecule junctions |
title_fullStr | Resolving metal-molecule interfaces at single-molecule junctions |
title_full_unstemmed | Resolving metal-molecule interfaces at single-molecule junctions |
title_short | Resolving metal-molecule interfaces at single-molecule junctions |
title_sort | resolving metal-molecule interfaces at single-molecule junctions |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4879565/ https://www.ncbi.nlm.nih.gov/pubmed/27221947 http://dx.doi.org/10.1038/srep26606 |
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