State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, PR China.
J Colloid Interface Sci. 2011 Jul 15;359(2):351-8. doi: 10.1016/j.jcis.2011.04.042. Epub 2011 Apr 18.
The construction of supercrystals with non-spherical building blocks has attracted increasing attention due to their potential applications in the fabrication of novel devices. In this study, we report the large-scale preparation of dimension-controllable supercrystals of polyhedral PbS nanocrystals through a solvent evaporation approach. Because of the capillary flow of the drying droplet on the substrate, nanocrystals self-assemble into three distinct types of supercrystals on specific regions of the substrate during the solvent evaporation: two-dimensional supercrystals appear in the central region; three-dimensional faceted supercrystals and three-dimensional bulk supercrystals are found near the edge of the substrate. Moreover, the formation of superlattice structure of each type of supercrystals can be tuned by changing the shape of building blocks. The influences of experimental factors on self-assembly are investigated as well. We anticipate that our research can provide some new insights into the construction of supercrystals with novel structures and large sizes.
由于具有潜在的新型器件制造应用，具有非球形构筑基元的超晶体的构建引起了越来越多的关注。在这项研究中，我们通过溶剂挥发法报道了通过该方法大规模制备具有可控维度的多面体形 PbS 纳米晶的超晶体。由于干燥液滴在基底上的毛细流动，在溶剂挥发过程中，纳米晶在基底的特定区域自组装成三种不同类型的超晶体：二维超晶体出现在中央区域；在基底边缘附近发现了三维面心超晶体和三维块状超晶体。此外，通过改变构筑基元的形状可以调节每种超晶体的超晶格结构的形成。还研究了实验因素对自组装的影响。我们期望我们的研究能够为构建具有新颖结构和大尺寸的超晶体提供一些新的见解。
