Seeded Growth of Nanoscale Semiconductor Tetrapods: Generality and the Role of Cation Exchange
Seeded Growth of Nanoscale Semiconductor Tetrapods: Generality and the Role of Cation Exchange
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DOI：
10.1021/acs.chemmater.0c01407
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发表时间：
2020-06-09
影响因子：
8.6
通讯作者：
Cossairt, Brandi M.
中科院分区：
文献类型：
--
作者：
Enright, Michael J.;Dou, Florence Y.;Cossairt, Brandi M.
利用ZnTe、CuInS2、InP、InP/ZnS和Cd3P2等量子点种子，合成了具有独立可调核心、臂尺寸和纵横比的纳米四足体。II-VI、I-III-VI、III-V和II-V种子的范围既包括立方晶格，也包括四边形晶格，这表明cd臂在可达平面（111）表面上生长的多功能性，包括扭曲结构和扭曲结构的表面。除了Cd3P2种子，其影响不显著，在最终的四足动物中，观察到核心区的阳离子交换与臂生长同时发生，从而产生合金核心区。这一结果支持了最近对由不同阳离子组成的核/壳量子点组成的研究，并提出了利用传统溶剂热方法在纳米级半导体异质结构中获得清洁界面的挑战。相反，强健的Cd3P2/CdS四足结构代表了多足异质结构中罕见的近红外（NIR）发射。从Cd3P2核中成功地获得了nir发射的四足异质结构，并结合了高长宽比和低长宽比CdS臂。
Nanoscale tetrapods were synthesized with independently tunable core and arm sizes and aspect ratios from a spectrum of quantum dot seeds, including ZnTe, CuInS2, InP, InP/ZnS, and Cd3P2. The range of II-VI, I-III-VI, III-V, and II-V seeds included both cubic and tetragonal lattices, demonstrating the versatility of CdS arm growth upon surfaces with accessible (111) planes, including those with distorted those with distorted structures. Except for the Cd3P2 seeds, where the effect is inconsequential, cation exchange in the core was observed to occur concurrently with arm growth to give alloyed cores in the final tetrapods. This result supports recent work characterizing the composition of core/shell quantum dots composed of distinct cations and presents a challenge to achieving clean interfaces in nanoscale semiconductor heterostructures grown by using traditional solvothermal methods. Conversely, the robust Cd3P2/CdS tetrapod architecture represents a rare example of near-infrared (NIR) emission in a multipod heterostructure. NIR-emissive tetrapod heterostructures were successfully obtained from Cd3P2 cores in combination with both high and low aspect ratio CdS arms.