Cumulene Wires Display Increasing Conductance with Increasing Length
| Autor: | Fay Ng, Latha Venkataraman, Hexing Li, Qi Zou, Yaping Zang, Michael L. Steigerwald, Colin Nuckolls, Tianren Fu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering Bond length alternation chemistry.chemical_element Molecular electronics Cumulene Conductance Bioengineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Length dependence Molecular wire chemistry.chemical_compound chemistry Chemical physics General Materials Science 0210 nano-technology Carbon |
| Zdroj: | Nano letters. 20(11) |
| ISSN: | 1530-6992 |
| Popis: | One-dimensional sp-hybridized carbon wires, including cumulenes and polyynes, can be regarded as finite versions of carbynes. They are likely to be good candidates for molecular-scale conducting wires as they are predicted to have a high-conductance. In this study, we first characterize the single-molecule conductance of a series of cumulenes and polyynes with a backbone ranging in length from 4 to 8 carbon atoms, including [7]cumulene, the longest cumulenic carbon wire studied to date for molecular electronics. We observe different length dependence of conductance when comparing these two forms of carbon wires. Polyynes exhibit conductance decays with increasing molecular length, while cumulenes show a conductance increase with increasing molecular length. Their distinct conducting behaviors are attributed to their different bond length alternation, which is supported by theoretical calculations. This study confirms the long-standing theoretical predictions on sp-hybridized carbon wires and demonstrates that cumulenes can form highly conducting molecular wires. |
| Databáze: | OpenAIRE |
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