Borophene Concentric Superlattices via Self-Assembly of Twin Boundaries

Liren Liu, Zhuhua Zhang, Xiaolong Liu, Xiaoyu Xuan, Boris I. Yakobson, Mark C. Hersam, Wanlin Guo

Research output: Contribution to journalArticle

Abstract

Due to its in-plane structural anisotropy and highly polymorphic nature, borophene has been shown to form a diverse set of linear superlattice structures that are not observed in other two-dimensional materials. Here, we show both theoretically and experimentally that concentric superlattice structures can also be realized in borophene via the energetically preferred self-Assembly of coherent twin boundaries. Since borophene twin boundaries do not require the creation of additional lattice defects, they are exceptionally low in energy and thus easier to nucleate and even migrate than grain boundaries in other two-dimensional materials. Due to their high mobility, borophene twin boundaries naturally self-Assemble to form novel phases consisting of periodic concentric loops of filled boron hexagons that are further preferred energetically by the rotational registry of borophene on the Ag(111) surface. Compared to defect-free borophene, concentric superlattice borophene phases are predicted to possess enhanced mechanical strength and localized electronic states. Overall, these results establish defect-mediated self-Assembly as a pathway to unique borophene structures and properties.

Original languageEnglish
Pages (from-to)1315-1321
Number of pages7
JournalNano letters
Volume20
Issue number2
DOIs
Publication statusPublished - Feb 12 2020

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Keywords

  • Boron nanostructure
  • density functional theory calculation
  • superlattice
  • twin boundary
  • two-dimensional material

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Liu, L., Zhang, Z., Liu, X., Xuan, X., Yakobson, B. I., Hersam, M. C., & Guo, W. (2020). Borophene Concentric Superlattices via Self-Assembly of Twin Boundaries. Nano letters, 20(2), 1315-1321. https://doi.org/10.1021/acs.nanolett.9b04798