Synthesis of borophenes: Anisotropic, two-dimensional boron polymorphs
Synthesis of borophenes: Anisotropic, two-dimensional boron polymorphs
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硼烯的合成：各向异性二维硼多晶型物
DOI：
10.1126/science.aad1080
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发表时间：
2015-12-18
期刊：
影响因子：
56.9
通讯作者：
Guisinger, Nathan P.
中科院分区：
文献类型：
--
作者：
Mannix, Andrew J.;Zhou, Xiang-Feng;Guisinger, Nathan P.
硼苯：二维的硼尽管碳和硼的体积同素异形体差别很大，但这些元素的小簇却表现出惊人的相似性。二维碳同素异形体如石墨烯的硼类似物已经被预测。现在Mannix等人报道了在超高真空条件下将元素硼沉积在银表面上形成二维硼的方法（参见Sachdev的观点）。类似石墨烯的结构是弯曲的，与衬底弱结合，并且是金属的。《科学》，本期第1513页；另见第1468页二维硼同素异形体在真空中使其元素蒸气沉积在银表面后形成。[另见Sachdev的观点]在原子簇尺度上，纯硼与碳明显相似，可以形成简单的平面分子和笼状富勒烯。理论研究预测，二维（2D）硼片将采用类似于硼原子团簇的原子构型。我们在超高真空条件下在银表面合成了原子级薄的结晶二维硼片（即硼苯）。在理论计算的支持下，原子尺度的表征揭示了具有多尺度各向异性、面外屈曲的熔融硼团簇的结构。与块状硼同素异形体不同，硼苯显示出与预测高度各向异性的二维金属相一致的金属特征。
Borophene: Boron in two dimensions Although bulk allotropes of carbon and boron differ greatly, small clusters of these elements show remarkable similarities. Boron analogs of two-dimensional carbon allotropes such as graphene have been predicted. Now Mannix et al. report the formation of two-dimensional boron by depositing the elemental boron onto a silver surface under ultrahigh-vacuum conditions (see the Perspective by Sachdev). The graphene-like structure was buckled, weakly bonded to the substrate, and metallic. Science, this issue p. 1513; see also p. 1468 A two-dimensional boron allotrope forms after depositing its elemental vapor on a silver surface in vacuum. [Also see Perspective by Sachdev] At the atomic-cluster scale, pure boron is markedly similar to carbon, forming simple planar molecules and cage-like fullerenes. Theoretical studies predict that two-dimensional (2D) boron sheets will adopt an atomic configuration similar to that of boron atomic clusters. We synthesized atomically thin, crystalline 2D boron sheets (i.e., borophene) on silver surfaces under ultrahigh-vacuum conditions. Atomic-scale characterization, supported by theoretical calculations, revealed structures reminiscent of fused boron clusters with multiple scales of anisotropic, out-of-plane buckling. Unlike bulk boron allotropes, borophene shows metallic characteristics that are consistent with predictions of a highly anisotropic, 2D metal.