Borophene Synthesis on Au(111)
Borophene Synthesis on Au(111)
复制标题
Au(111) 上硼烯的合成
DOI：
10.1021/acsnano.8b09339
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发表时间：
2019-04-01
期刊：
影响因子：
17.1
通讯作者：
Guisinger, Nathan P.
中科院分区：
文献类型：
--
作者：
Kiraly, Brian;Liu, Xiaolong;Guisinger, Nathan P.
Borophene（硼的第一个二维（2D）同素异形体）正在成为硼基化学以及更广泛的低维材料领域的开创性系统。探索生长的相空间是至关重要的，因为硼氢化物是一种合成的2D材料，它没有大块的层状对应物，因此不能通过剥离方法分离。本文报道了在Au（111）衬底上合成硼氢化物。与以前研究的银基板上的生长，硼扩散到Au在升高的温度和偏析的表面，形成硼氢化物岛作为基板冷却。这些观察结果支持从头计算模型的间隙硼扩散到Au晶格。硼氢化物合成也改变了Au（111）衬底的表面重构，导致三角形网络，其在低覆盖率下模板生长。这种初始生长由离散的硼化物纳米团簇组成，其形状和大小与理论预测一致。随着硼浓度的增加，纳米模板分解并观察到更大的硼氢化物岛。光谱测量表明，生长在Au（111）上的硼化物具有金属电子结构，这表明在二维等离子体、超导、互连、电极和透明导体中的潜在应用。
Borophene (the first two-dimensional (2D) allotrope of boron) is emerging as a groundbreaking system for boron-based chemistry and, more broadly, the field of low-dimensional materials. Exploration of the phase space for growth is critical because borophene is a synthetic 2D material that does not have a bulk layered counterpart and thus cannot be isolated via exfoliation methods. Herein, we report synthesis of borophene on Au(111) substrates. Unlike previously studied growth on Ag substrates, boron diffuses into Au at elevated temperatures and segregates to the surface to form borophene islands as the substrate cools. These observations are supported by ab initio modeling of interstitial boron diffusion into the Au lattice. Borophene synthesis also modifies the surface reconstruction of the Au(111) substrate, resulting in a trigonal network that templates growth at low coverage. This initial growth is composed of discrete borophene nanoclusters, whose shape and size are consistent with theoretical predictions. As the concentration of boron increases, nanotemplating breaks down and larger borophene islands are observed. Spectroscopic measurements reveal that borophene grown on Au(111) possesses a metallic electronic structure, suggesting potential applications in 2D plasmonics, superconductivity, interconnects, electrodes, and transparent conductors.