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Quantifying the conductivity of a single polyene chain by lifting with an STM tip

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  • Sifan You

    (Soochow University)

  • Cuiju Yu

    (University of Science and Technology of China)

  • Yixuan Gao

    (Chinese Academy of Sciences
    University of Science and Technology Beijing)

  • Xuechao Li

    (Soochow University)

  • Guyue Peng

    (Soochow University)

  • Kaifeng Niu

    (Linköping University)

  • Jiahao Xi

    (Soochow University)

  • Chaojie Xu

    (Soochow University)

  • Shixuan Du

    (Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Xingxing Li

    (University of Science and Technology of China)

  • Jinlong Yang

    (University of Science and Technology of China)

  • Lifeng Chi

    (Soochow University)

Abstract

Conjugated polymers are promising candidates for molecular wires in nanoelectronics, with flexibility in mechanics, stability in chemistry and variety in electrical conductivity. Polyene, as a segment of polyacetylene, is a typical conjugated polymer with straightforward structure and wide-range adjustable conductance. To obtain atomic scale understanding of charge transfer in polyene, we have measured the conductance of a single polyene-based molecular chain via lifting it up with scanning tunneling microscopy tip. Different from semiconducting characters in pristine polyene (polyacetylene), high conductance and low decay constant are obtained, along with an electronic state around Fermi level and characteristic vibrational mode. These observed phenomena result from pinned molecular orbital owing to molecule-electrode coupling at the interface, and weakened bond length alternation due to electron-phonon coupling inside single molecular chain. Our findings emphasize the interfacial characteristics in molecular junctions and promising properties of polyene, with single molecular conductance as a vital tool for bringing insights into the design and construction of nanodevices.

Suggested Citation

  • Sifan You & Cuiju Yu & Yixuan Gao & Xuechao Li & Guyue Peng & Kaifeng Niu & Jiahao Xi & Chaojie Xu & Shixuan Du & Xingxing Li & Jinlong Yang & Lifeng Chi, 2024. "Quantifying the conductivity of a single polyene chain by lifting with an STM tip," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50915-8
    DOI: 10.1038/s41467-024-50915-8
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    References listed on IDEAS

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    1. Eric J. Meier & Fangzhao Alex An & Bryce Gadway, 2016. "Observation of the topological soliton state in the Su–Schrieffer–Heeger model," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    2. Christophe Nacci & Francisco Ample & David Bleger & Stefan Hecht & Christian Joachim & Leonhard Grill, 2015. "Conductance of a single flexible molecular wire composed of alternating donor and acceptor units," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
    3. P. H. Jacobse & A. Kimouche & T. Gebraad & M. M. Ervasti & J. M. Thijssen & P. Liljeroth & I. Swart, 2017. "Electronic components embedded in a single graphene nanoribbon," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
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