Condensed Matter and Interfaces and §Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University , 3508 TA Utrecht, The Netherlands.
Nano Lett. 2014 Feb 12;14(2):1032-7. doi: 10.1021/nl4046069. Epub 2014 Jan 21.
We present a combined experimental, theoretical, and simulation study on the self-assembly of colloidal hexagonal bipyramid- and hexagonal bifrustum-shaped ZnS nanocrystals (NCs) into two-dimensional superlattices. The simulated NC superstructures are in good agreement with the experimental ones. This shows that the self-assembly process is primarily driven by minimization of the interfacial free-energies and maximization of the packing density. Our study shows that a small truncation of the hexagonal bipyramids is sufficient to change the symmetry of the resulting superlattice from hexagonal to tetragonal, highlighting the crucial importance of precise shape control in the fabrication of functional metamaterials by self-assembly of colloidal NCs.
我们提出了一个胶体六方双锥和六方双截棱锥形 ZnS 纳米晶体（NCs）自组装成二维超晶格的实验、理论和模拟综合研究。模拟的 NC 超结构与实验结果吻合良好。这表明自组装过程主要由界面自由能最小化和堆积密度最大化驱动。我们的研究表明，对六方双锥的小截断足以将所得超晶格的对称性从六方变为四方，这突出了通过胶体 NCs 自组装制造功能超材料时精确形状控制的至关重要性。
