Stanene: Atomically Thick Free-standing Layer of 2D Hexagonal Tin.
Stanene: Atomically Thick Free-standing Layer of 2D Hexagonal Tin.
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DOI：
10.1038/srep31073
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发表时间：
2016-08-05
影响因子：
4.6
通讯作者：
Shukla S
中科院分区：
文献类型：
--
作者：
Saxena S;Chaudhary RP;Shukla S
锡烯是一种重要的二维材料，由于其自旋轨道能隙的开放而具有室温拓扑效应。在这种追求中，我们报告的合成和研究的光学性质的锡烯到几层，一个二维的六方结构的类似物的石墨烯。使用配备SAED和EDAX探测器的HRTEM进行的原子尺度形态和元素表征证实了Sn原子的六方晶格的存在。由SAED得到的拉曼峰沿着面间距d的位置与第一性原理计算的结果一致，证实了所制备的Sn薄片不是（111）α-Sn薄片。此外，在~191 nm和~233 nm处使用密度泛函理论计算的低屈曲锡烯的光学特征与测量的UV-Vis吸收光谱定性一致。原子力显微镜测量表明层间距为~0.33 nm，与外延锡烯片报道的一致。在EDAX光谱中没有观察到痕量的氧，表明不存在任何氧化相。这也证实了拉曼测量通过与氧化锡烯片比较。
Stanene is one of most important of 2D materials due to its potential to demonstrate room temperature topological effects due to opening of spin-orbit gap. In this pursuit we report synthesis and investigation of optical properties of stanene up to few layers, a two-dimensional hexagonal structural analogue of graphene. Atomic scale morphological and elemental characterization using HRTEM equipped with SAED and EDAX detectors confirm the presence of hexagonal lattice of Sn atoms. The position of Raman peak along with the inter-planar ‘d’ spacing obtained from SAED for prepared samples are in good agreement with that obtained from first principles calculations and confirm that the sheets are not (111) α-Sn sheets. Further, the optical signature calculated using density functional theory at ~191 nm and ~233 nm for low buckled stanene are in qualitative agreement with the measured UV-Vis absorption spectrum. AFM measurements suggest interlayer spacing of ~0.33 nm in good agreement with that reported for epitaxial stanene sheets. No traces of oxygen were observed in the EDAX spectrum suggesting the absence of any oxidized phases. This is also confirmed by Raman measurements by comparing with oxidized stanene sheets.