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首页> 外文期刊>Advanced Functional Materials >Ligand-Programmed Consecutive Symmetry Break(s) in Nanoparticle Based Materials Showing Emergent Phenomena: Transitioning from Sixfold to Threefold Symmetry in Anisotropic ZnO Colloids
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Ligand-Programmed Consecutive Symmetry Break(s) in Nanoparticle Based Materials Showing Emergent Phenomena: Transitioning from Sixfold to Threefold Symmetry in Anisotropic ZnO Colloids

机译：基于纳米粒子的材料的配体编程的连续对称性断裂，显示出急转现象：从四异喉胶体中从六倍转换到三倍对称性

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The central promise of nanoparticle-based materials is that cooperative properties may emerge, when individual quantum dots are positioned on a periodic lattice. Yet, there are only a few papers in the literature reporting such effects. Nevertheless, it is clear that the symmetry of the superlattice is decisive for the desired emergent phenomena. An interesting question is, how the symmetry of the initial monodisperse nanoparticles affects the structure of the colloidal crystal during self-assembly processes. For instance, particles with a hexagonal cross-section demonstrate self-organization, which is very similar to spherical colloids. Likewise, one would also expect that trigonal nanoparticles behave similarly. Unfortunately, it is very hard to obtain monodisperse semiconductor colloids with a trigonal shape, because this requires a symmetry break during morphogenesis of the nanocrystal. While such a symmetry break is known in the literature for structures attached to a solid substrate, herein, colloidal synthesis of trigonal ZnO nanorods is successfully demonstrated, and the mechanism is elucidated via experimental and theoretical methods. 2D-superlattices formed by such particles with trigonal cross-section are compared to hexagonal analogues. It is found that there are distinct differences, which result in important differences in properties such as the formation of voids and also in optical properties.
机译：当各个量子点定位在周期性格子上时，基于纳米粒子的材料的中央承诺是可以出现的协同性质。然而，文献中只有几篇论文报告了这些效果。然而，显然，超晶格对称性对于所需的出现现象具有决定性。一个有趣的问题是，初始单分散纳米颗粒的对称性如何影响自组装过程中胶体晶体的结构。例如，具有六边形横截面的颗粒展示了自组织，其与球形胶体非常相似。同样，人们还期望三角形纳米粒子表现得类似。不幸的是，很难获得具有三角形的单分散半导体胶体，因为这在纳米晶体的形态发生期间需要对称断裂。虽然在附着于固体基质的结构的文献中已知这种对称性断裂，但在本文中，成功地说明了三角形ZnO纳米棒的胶体合成，并通过实验和理论方法阐明该机构。将这种颗粒形成的2D-与三角形横截面形成的超晶格与六边形类似物进行比较。结果发现存在明显的差异，这导致性质的重要差异，例如空隙的形成和光学性质。

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