Pressure Induced Assembly and Coalescence of Lead Chalcogenide Nanocrystals
Pressure Induced Assembly and Coalescence of Lead Chalcogenide Nanocrystals
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DOI：
10.1021/jacs.0c13350
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发表时间：
2021-02-12
影响因子：
15
通讯作者：
Qin, Yang
中科院分区：
文献类型：
--
作者：
Meng, Lingyao;Duwal, Sakun;Qin, Yang
我们在这里报告的压力诱导的有序铅硫族化合物纳米阵列成一维（1D）和2D纳米结构的聚合。特别是，原子晶体相变和PbS和PbSe纳米晶体的介观尺度聚结已分别观察和监测原位宽角和小角同步辐射X射线散射技术。在原子尺度上，这两种纳米晶体经历了可逆的结构转变，从立方到正交在显着更高的压力比相应的散装材料。在介观尺度下，PbS_xO_x有趣的是，透射电子显微镜显示，施加的压力迫使两种球形纳米晶体合并成单晶2D纳米片和1D纳米棒。我们的研究结果证实，压力可以作为一种简单的方法来操纵粒子间的间距和工程师的纳米结构与特定的形态，因此，提供了深入了解新的半导体纳米结构的设计和功能在高压条件下。
We report here pressure induced nanocrystal coalescence of ordered lead chalcogenide nanocrystal arrays into onedimensional (1D) and 2D nanostructures. In particular, atomic crystal phase transitions and mesoscale coalescence of PbS and PbSe nanocrystals have been observed and monitored in situ respectively by wide- and small-angle synchrotron X-ray scattering techniques. At the atomic scale, both nanocrystals underwent reversible structural transformations from cubic to orthorhombic at significantly higher pressures than those for the corresponding bulk materials. At the mesoscale, PbS nanocrystal arrays displayed a superlattice transformation from face-centered cubic to lamellar structures, while no clear mesoscale lattice transformation was observed for PbSe nanocrystal arrays. Intriguingly, transmission electron microscopy showed that the applied pressure forced both spherical nanocrystals to coalesce into single crystalline 2D nanosheets and 1D nanorods. Our results confirm that pressure can be used as a straightforward approach to manipulate the interparticle spacing and engineer nanostructures with specific morphologies and, therefore, provide insights into the design and functioning of new semiconductor nanocrystal structures under high-pressure conditions.