Wang Peng-Peng, Qiao Qiao, Zhu Yimei, Ouyang Min
Department of Physics and Center for Nanophysics and Advanced Materials , University of Maryland , College Park , Maryland 20742 , United States.
Condensed Matter Physics and Materials Science Department , Brookhaven National Laboratory , Upton , New York 11973 , United States.
J Am Chem Soc. 2018 Jul 25;140(29):9095-9098. doi: 10.1021/jacs.8b05643. Epub 2018 Jul 12.
Colloidal binary supracrystals (SCs) possessing tunable and ordered assembly of two different types of functional nanoparticles (NPs) represent a unique class of artificial materials for both fundamental study and technological applications, but related study has been limited due to substantial challenges in materials growth. Here we report the controlled growth of colloidal binary SCs consisting of Au and FeO NPs via an oil-in-water emulsion process. The size, stoichiometry, and lattice structure of the SCs can be broadly tuned by the growth parameters. Furthermore, our growth method is general and applicable to other NP building blocks to achieve various functional binary SCs. These as-grown free-standing binary SCs should therefore enable new test beds for exploring different nanoscale interactions ranging from the formation and stability of nanoscale binary phase to the emerging magneto-plasmonic coupling physics.
具有两种不同类型功能纳米粒子（NP）的可调谐且有序组装的胶体二元超晶体（SC），是一类独特的人造材料，可用于基础研究和技术应用，但由于材料生长方面的重大挑战，相关研究一直有限。在此，我们报告了通过水包油乳液法可控生长由金纳米粒子和FeO纳米粒子组成的胶体二元超晶体。超晶体的尺寸、化学计量比和晶格结构可通过生长参数进行广泛调节。此外，我们的生长方法具有通用性，适用于其他纳米粒子构建块，以实现各种功能二元超晶体。因此，这些生长出来的独立二元超晶体应该能够为探索不同的纳米级相互作用提供新的测试平台，这些相互作用涵盖从纳米级二元相的形成和稳定性到新兴的磁等离子体耦合物理。
