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Borophene Concentric Superlattices via Self-Assembly of Twin Boundaries.
Nano Letters ( IF 9.6 ) Pub Date : 2020-01-23 , DOI: 10.1021/acs.nanolett.9b04798 Liren Liu 1 , Zhuhua Zhang 1 , Xiaolong Liu 2 , Xiaoyu Xuan 1 , Boris I Yakobson 3 , Mark C Hersam 2, 4, 5 , Wanlin Guo 1
Nano Letters ( IF 9.6 ) Pub Date : 2020-01-23 , DOI: 10.1021/acs.nanolett.9b04798 Liren Liu 1 , Zhuhua Zhang 1 , Xiaolong Liu 2 , Xiaoyu Xuan 1 , Boris I Yakobson 3 , Mark C Hersam 2, 4, 5 , Wanlin Guo 1
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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.
中文翻译：
通过双边界的自组装形成的硼方同心超晶格。
由于其平面内结构各向异性和高度多态性，已证明硼烷可形成多种线性超晶格结构，而在其他二维材料中则未观察到。在这里，我们在理论上和实验上都表明，同心超晶格结构也可以通过在能量上偏爱的相干孪晶边界的自组装而在borophene中实现。由于硼苯晶双晶界不需要产生额外的晶格缺陷，因此它们的能量异常低，因此比其他二维材料中的晶界更容易成核，甚至迁移。由于它们的高机动性，硼苯双晶界自然地自组装形成新的相，该相由填充的硼六边形的周期性同心环组成，在能量上更优选通过硼（Ag（111）表面）的旋转配准来实现。与无缺陷的硼烷相比，预计同心超晶格硼烷相具有增强的机械强度和局部电子态。总体而言，这些结果建立了缺陷介导的自组装作为通往独特的硼烯结构和性质的途径。
更新日期：2020-01-23
中文翻译：
通过双边界的自组装形成的硼方同心超晶格。
由于其平面内结构各向异性和高度多态性，已证明硼烷可形成多种线性超晶格结构，而在其他二维材料中则未观察到。在这里，我们在理论上和实验上都表明，同心超晶格结构也可以通过在能量上偏爱的相干孪晶边界的自组装而在borophene中实现。由于硼苯晶双晶界不需要产生额外的晶格缺陷，因此它们的能量异常低，因此比其他二维材料中的晶界更容易成核，甚至迁移。由于它们的高机动性，硼苯双晶界自然地自组装形成新的相，该相由填充的硼六边形的周期性同心环组成，在能量上更优选通过硼（Ag（111）表面）的旋转配准来实现。与无缺陷的硼烷相比，预计同心超晶格硼烷相具有增强的机械强度和局部电子态。总体而言，这些结果建立了缺陷介导的自组装作为通往独特的硼烯结构和性质的途径。
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