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Advanced Materials

Mechanically Stretching Folded Nano-π-b;-stacks Reveals Pico-Newton Attractive Forces

Authors

  • Jung Sook Kim,

    1. Center for Integrated Molecular Systems and Department of Chemistry Pohang University of Science and Technology San 31 Hyoja-dong, Pohang, 790-784 (Korea)
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  • Yu Jin Jung,

    1. Center for Integrated Molecular Systems and Department of Chemistry Pohang University of Science and Technology San 31 Hyoja-dong, Pohang, 790-784 (Korea)
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  • Joon Won Park,

    Corresponding author
    1. Center for Integrated Molecular Systems and Department of Chemistry Pohang University of Science and Technology San 31 Hyoja-dong, Pohang, 790-784 (Korea)
    • Center for Integrated Molecular Systems and Department of Chemistry Pohang University of Science and Technology San 31 Hyoja-dong, Pohang, 790-784 (Korea).
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  • Andrew D. Shaller,

    1. Department of Chemistry and Center for Materials Research Washington State University Pullman, WA 99164 (USA)
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  • Wei Wan,

    1. Department of Chemistry and Center for Materials Research Washington State University Pullman, WA 99164 (USA)
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  • Alexander D. Q. Li

    Corresponding author
    1. Department of Chemistry and Center for Materials Research Washington State University Pullman, WA 99164 (USA)
    • Department of Chemistry and Center for Materials Research Washington State University Pullman, WA 99164 (USA).
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Abstract

Picoforce atomic force microscopy (AFM) and specific DNA hybridization have been used to lock on to synthetic nano-π-stacks, revealing the secrets of thermophilic, albeit weak, π–π interactions. A cone-shaped dendron created an appropriate lateral spacing to ensure that most times a single stack was confined between the tip and the substrate, eliminating undesired multi-molecular pulling and greatly simplifying data analysis.

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