正交 CsPbBr3 纳米晶的六面体对称性和多向面耦合,ACS Nano

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正交 CsPbBr3 纳米晶的六面体对称性和多向面耦合
ACS Nano ( IF 15.8 ) Pub Date : 2023-03-30 , DOI: 10.1021/acsnano.3c01617
Rakesh Kumar Behera ₁ , Suman Bera ₁ , Narayan Pradhan ₁

Affiliation

_{正交相CsPbBr 3}的立方体形状纳米晶体具有选择性小平面堆积的能力，可形成 1D、2D 和 3D 纳米结构。在解决方案中，广泛研究了它们通过线性一维堆积到纳米棒/纳米线的转变。在这里，报道了截断立方体纳米晶体在两个方向上的多面耦合到棒耦合，然后到单晶矩形棒。通过广泛的高分辨率透射电子显微镜图像分析，可以推导出这些纳米棒的长度和宽度方向。对于种子立方体结构，找到 {110} 和 {002} 面仍然很困难，因为它们具有六面体对称性并且它们的尺寸仍然较小；然而，对于纳米棒，这些平面以及 ⟨110⟩ 和 ⟨001⟩ 方向被清楚地识别。从纳米晶体到纳米棒的形成，观察到对齐方向是随机的（如抽象图形所示），并且这可能因同一批样品中获得的一根棒与另一根棒不同而不同。此外，这里的种子纳米晶体连接不是随机的，而是通过添加计算量的额外 Pb(II) 引起的。同样也被扩展到从不同文献方法获得的纳米立方体。据预测，创建了一个溴化铅缓冲八面体层来连接两个立方体，这可以同时沿着立方体的一个、两个甚至更多面连接，以连接其他立方体并形成不同的纳米结构。因此，这里的这些结果提供了种子立方体连接的一些基本原理，连接它们的驱动力，捕获中间体以可视化它们的附件对齐方式，₃纳米结构。

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Hexahedron Symmetry and Multidirectional Facet Coupling of Orthorhombic CsPbBr3 Nanocrystals

The cube shape of orthorhombic phase CsPbBr₃ nanocrystals possesses the ability of selective facet packing that leads to 1D, 2D, and 3D nanostructures. In solution, their transformation with linear one-dimensional packing to nanorods/nanowires is extensively studied. Here, multifacet coupling in two directions of the truncated cube nanocrystals to rod couples and then to single-crystalline rectangular rods is reported. With extensive high-resolution transmission electron microscopy image analysis, length and width directions of these nanorods are derived. For the seed cube structures, finding {110} and {002} facets has remained difficult as these possess the hexahedron symmetry and their size remains smaller; however, for nanorods, these planes and the ⟨110⟩ and ⟨001⟩ directions are clearly identified. From nanocrystal to nanorod formation, the alignment directions are observed as random (as shown in the abstract graphic), and this could vary from one to the other rods obtained in the same batch of samples. Moreover, seed nanocrystal connections are derived here as not random and are rather induced by addition of the calculated amount of additional Pb(II). The same has also been extended to nanocubes obtained from different literature methods. It is predicted that a Pb-bromide buffer octahedra layer was created to connect two cubes, and this can connect along one, two, or even more facets of cubes simultaneously to connect other cubes and form different nanostructures. Hence, these results here provide some basic fundamentals of seed cube connections, the driving force to connect those, trapping the intermediate to visualize their alignments for attachments, and identifying and establishing the orthorhombic ⟨110⟩ and ⟨001⟩ directions of the length and width of CsPbBr₃ nanostructures.

更新日期：2023-03-30

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