Antimony oxide nanostructures in the monolayer limit: self-assembly of van der Waals-bonded molecular building blocks
Antimony oxide nanostructures in the monolayer limit: self-assembly of van der Waals-bonded molecular building blocks
复制标题
单层极限的氧化锑纳米结构：范德华键合分子构件的自组装
DOI：
10.1088/1361-6528/abd059
复制
发表时间：
2021
期刊：
影响因子：
3.5
通讯作者：
Brown, Simon A
中科院分区：
文献类型：
--
作者：
Märkl, Tobias;Salehitaleghani, Sara;Le Ster, Maxime;Kowalczyk, Pawel J;Wang, Xiaoxiong;Wang, Peng;Snyder, Matthew;Bian, Guang;Chiang, Tai-Chang;Brown, Simon A
氧化锑纳米结构已被确定为一系列电子和光电应用的候选者。在这里，我们展示了二维氧化锑纳米结构在各种基材上的生长，包括高取向热解石墨（HOPG）、MoS 2 和α-Bi（110）纳米岛。使用扫描隧道显微镜（STM），我们发现所形成的纳米结构完全是高度结晶的α-Sb 2 O 3 (111)单层，其晶格常数为796 pm±7 pm。纳米结构是三角形的，横向尺寸高达～30 nm。尽管元素锑纳米结构同时生长，但没有观察到混合相，并且两种材料都表现出各自独特的生长模式。还可以观察和模拟莫尔图案，从而确认原子晶胞并了解 Sb 2 O 3 结构相对于支撑材料的方向。与本体一样，Sb 2 O 3 纳米结构由通过范德华力弱相互作用的Sb 4 O 6 分子形成。这允许使用 STM 尖端对纳米结构进行物理修饰。扫描隧道光谱揭示了至少 3.5 eV 的宽带隙。最后，我们表明，根据我们的 DFT 计算，可以排除具有与观察到的晶胞相当的晶胞的可能替代结构。所考虑的结构是 β-Sb 的 2× 2 重建，每个晶胞有一个空位，以及由 Sb 4 簇组成的范德华固体。之前的报告主要证明了具有更大厚度的Sb 2 O 3 结构。
Antimony oxide nanostructures have been identified as candidates for a range of electronic and optoelectronic applications. Here we demonstrate the growth of 2-dimensional antimony oxide nanostructures on various substrates, including highly oriented pyrolytic graphite (HOPG), MoS 2 and α-Bi (110) nanoislands. Using scanning tunneling microscopy (STM) we show that the nanostructures formed are exclusively highly crystalline α-Sb 2 O 3 (111) monolayers with a lattice constant of 796 pm±7 pm. The nanostructures are triangular with lateral dimensions of up to∼ 30 nm. Even though elemental antimony nanostructures are grown simultaneously mixed phases are not observed and both materials exhibit their own distinct growth modes. Moiré patterns are also observed and simulated, allowing confirmation of the atomic unit cell and an understanding of the orientation of the Sb 2 O 3 structures with respect to the supporting materials. As in the bulk, the Sb 2 O 3 nanostructures are formed from Sb 4 O 6 molecules that are weakly interacting through van der Waals forces. This allows physical modification of the nanostructures with the STM tip. Scanning tunnelling spectroscopy reveals a wide band gap of at least 3.5 eV. Finally, we show that possible alternative structures that have unit cells comparable to those observed can be excluded based on our DFT calculations. The considered structures are a 2× 2 reconstruction of β-Sb with one vacancy per unit cell and a van der Waals solid composed of Sb 4 clusters. Previous reports have predominantly demonstrated Sb 2 O 3 structures with much larger thicknesses.
影响因子：
5.5
作者：
Assebban, Mhamed;Gibaja, Carlos;Abellan, Gonzalo
通讯作者：
Abellan, Gonzalo
影响因子：
3.9
作者：
A. Rosenberg;A. Menna;T. Turnbull
通讯作者：
T. Turnbull