Long-armed hexapod nanocrystals of cesium lead bromide.,Nanoscale

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Long-armed hexapod nanocrystals of cesium lead bromide.
Nanoscale ( IF 5.8 ) Pub Date : 2020-07-07 , DOI: 10.1039/d0nr02985h
Shangkun Li ₁ , Julie Probst ₁ , Philip D Howes ₁ , Andrew J deMello ₁

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Colloidal lead halide perovskite nanocrystals (LHP NCs) assume a variety of morphologies (e.g. cubes, sheets, and wires). Their labile structural and surface characters allow them to undergo post-synthetic evolution of shape and crystallographic characters. Such transformations can be advantageous or deleterious, and it is therefore vital to both understand and exert control over these processes. In this study, we report novel long-armed hexapod structures of cesium lead bromide nanocrystals. These branched structures evolve from quantum-confined CsPbBr₃ nanosheets to Cs₄PbBr₆ hexapods over a period of 24 hours. Time-resolved optical and structural characterization reveals a post-synthesis mechanism of phase transformation, oriented attachment and branch elongation. More generally, the study reveals important processes associated with LHP NC aging and demonstrates the utility of slow reaction kinetics in obtaining complex morphologies.

中文翻译：

溴化铯铯的长臂六足形纳米晶体。

胶态卤化铅钙钛矿纳米晶体（LHP NCs）具有多种形态（例如，立方体，薄片和金属丝）。它们不稳定的结构和表面特征使它们能够进行形状和晶体学特征的合成后演变。这种转换可能是有利的，也可能是有害的，因此，对这些过程的理解和控制至关重要。在这项研究中，我们报告了铯铯溴化铅纳米晶体的新型长臂六足动物结构。这些分支结构从量子限制的CsPbBr ₃纳米片演变为Cs ₄ PbBr ₆六足动物在24小时内。时间分辨的光学和结构表征揭示了相变，定向附着和分支伸长的后合成机理。更广泛地说，这项研究揭示了与LHP NC老化相关的重要过程，并证明了慢速反应动力学在获得复杂形态方面的实用性。

更新日期：2020-07-16

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