Borophene Concentric Superlattices via Self-Assembly of Twin Boundaries

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.

Adsorption of toxic gases on borophene: surface deformation links to chemisorptions

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Borophene: Current Status, Challenges and Opportunities

“…Since the end of the last century, boron nanostructures had been studied, which include zero‐dimensional (0D) clusters and one dimensional (1D) nanotubes. 2D boron sheets, as the most basic units for constructing the boron nanostructures, had attracted great attention in the past two decades . Especially, Boustani, Ismail‐Beigi and Yakobson et al.…”

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‘Colorful’ Polyline Grain Boundaries in Two-dimensional Transition Metal Dichalcogenides

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