L. Gray, Kadaba Swathi, Dundappa Mumbaraddi, Timothy W. Carlson, G. Marcus, David Carroll
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引用次数: 0
摘要
在这项工作中,我们提出了一种溶热原位掺杂方法,用于合成晶体掺杂二维碲化铋(Bi2Te3)纳米板。在铋(Bi)位点上选择等电子锑(Sb)取代,以最大限度地减少纳米结构中的晶格应变。通过结合使用 X 射线技术和电子显微镜,我们证明 Bi2Te3 所特有的斜方晶体结构(空间群 R3̄m)在少五层六边形纳米板中得以保留。我们的研究结果表明,在原子浓度不超过 1%的纳米板中,锑的分散是均匀的。超过这一阈值后,除了在块体的铋位点形成锑替代外,沿着晶体边缘开始形成无序的锑碲合金,从而限制了纳米板的进一步生长。此外,我们还研究了随着 Sb 置换导致晶格应变增加,纳米板内部产生的不同应力。这项研究从根本上揭示了掺杂剂对电子相关二维晶体自组装生长的影响。
Solvothermal synthesis of crystalline 2D bismuth telluride with an isoelectronic dopant
In this work, we present a solvothermal, in situ doping methodology for synthesizing crystalline doped 2D bismuth telluride (Bi2Te3) nanoplates. Isoelectronic antimony (Sb) substitution at the bismuth (Bi) site is chosen to minimize the lattice strain in the nanostructure. Using a combination of x-ray techniques and electron microscopy, we demonstrate that the rhombohedral crystal structure (space group R3̄m), characteristic of Bi2Te3 is preserved in few-quintuple-layer, hexagonal nanoplates. Our findings reveal a uniform dispersion of Sb within the nanoplates up to an atomic concentration of 1%. Beyond this threshold, a disordered SbTe alloy begins to form along the crystal edges in addition to Sb substitution at the Bi sites in the bulk, restricting further growth of the nanoplates. In addition, we examine the different stresses that develop within the nanoplates as lattice strain increases due to Sb substitution. This study provides fundamental insights into the dopant’s effect on the self-assembled growth of electronically relevant 2D crystals.
期刊介绍:
APL Materials features original, experimental research on significant topical issues within the field of materials science. In order to highlight research at the forefront of materials science, emphasis is given to the quality and timeliness of the work. The journal considers theory or calculation when the work is particularly timely and relevant to applications.
In addition to regular articles, the journal also publishes Special Topics, which report on cutting-edge areas in materials science, such as Perovskite Solar Cells, 2D Materials, and Beyond Lithium Ion Batteries.