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Cumulene Wires Display Increasing Conductance with Increasing Length
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    Cumulene Wires Display Increasing Conductance with Increasing Length
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    • Yaping Zang
      Yaping Zang
      Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
      More by Yaping Zang
    • Tianren Fu
      Tianren Fu
      Department of Chemistry, Columbia University, New York, New York 10027, United States
      More by Tianren Fu
    • Qi Zou*
      Qi Zou
      Department of Chemistry, Columbia University, New York, New York 10027, United States
      Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
      *E-mail: (Q.Z.) [email protected]
      More by Qi Zou
    • Fay Ng
      Fay Ng
      Department of Chemistry, Columbia University, New York, New York 10027, United States
      More by Fay Ng
    • Hexing Li
      Hexing Li
      Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
      More by Hexing Li
    • Michael L. Steigerwald
      Michael L. Steigerwald
      Department of Chemistry, Columbia University, New York, New York 10027, United States
    • Colin Nuckolls*
      Colin Nuckolls
      Department of Chemistry, Columbia University, New York, New York 10027, United States
      *Email: (C.N.) [email protected]
    • Latha Venkataraman*
      Latha Venkataraman
      Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
      Department of Chemistry, Columbia University, New York, New York 10027, United States
      *Email: (L.V.) [email protected]
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    Nano Letters

    Cite this: Nano Lett. 2020, 20, 11, 8415–8419
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    https://doi.org/10.1021/acs.nanolett.0c03794
    Published October 23, 2020
    Copyright © 2020 American Chemical Society

    Abstract

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    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.

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    This article is cited by 59 publications.

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    Nano Letters

    Cite this: Nano Lett. 2020, 20, 11, 8415–8419
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.0c03794
    Published October 23, 2020
    Copyright © 2020 American Chemical Society

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