Self-sensitization and photo-polymerization of diacetylene molecules self-assembled on a hexagonal-boron nitride nanosheet

Elisseos Verveniotis, Yuji Okawa, Kenji Watanabe, Takashi Taniguchi, Takaaki Taniguchi, Minoru Osada, Christian Joachim, Masakazu Aono

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Long poly-diacetylene chains are excellent candidates for planar, on-surface synthesized molecular electronic wires. Since hexagonal-Boron Nitride (h-BN) was identified as the best available atomically flat insulator for the deposition of poly-diacetylene precursors, we demonstrate the polymerization patterns and rate on it under UV-light irradiation, with subsequent polymer identification by atomic force microscopy. The results on h-BN indicate self-sensitization which yields blocks comprised of several polymers, unlike on the well-studied graphite/diacetylene system, where the polymers are always isolated. In addition, the photo-polymerization proceeds at least 170 times faster on h-BN, where it also results in longer polymers. Both effects are explained by the h-BN bandgap, which is larger than the diacetylene electronic excitation energy, thus allowing the transfer of excess energy absorbed by polymerized wires to adjacent monomers, triggering their polymerization. This work sets the stage for conductance measurements of single molecular poly-diacetylene wires on h-BN.

    Original languageEnglish
    Article number206
    JournalPolymers
    Volume10
    Issue number2
    DOIs
    Publication statusPublished - 2018 Feb 19

    Keywords

    • AFM
    • Diacetylene
    • H-BN surface
    • Molecular wires
    • Polymerization
    • Self-assembly
    • Selfsensitization

    ASJC Scopus subject areas

    • Chemistry(all)
    • Polymers and Plastics

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  • Cite this

    Verveniotis, E., Okawa, Y., Watanabe, K., Taniguchi, T., Taniguchi, T., Osada, M., Joachim, C., & Aono, M. (2018). Self-sensitization and photo-polymerization of diacetylene molecules self-assembled on a hexagonal-boron nitride nanosheet. Polymers, 10(2), [206]. https://doi.org/10.3390/polym10020206