堆积
成核
结晶学
共价键
材料科学
单体
晶体生长
Crystal(编程语言)
纳米技术
单晶
化学物理
化学
计算机科学
聚合物
有机化学
复合材料
程序设计语言
作者
Chengjun Kang,Kuiwei Yang,Zhaoqiang Zhang,Adam K. Usadi,David C. Calabro,Lisa Saunders Baugh,Yuxiang Wang,Jianwen Jiang,Xiaodong Zou,Zhehao Huang,Dan Zhao
标识
DOI:10.1038/s41467-022-29086-x
摘要
Abstract Resolving single-crystal structures of two-dimensional covalent organic frameworks (2D COFs) is a great challenge, hindered in part by limited strategies for growing high-quality crystals. A better understanding of the growth mechanism facilitates development of methods to grow high-quality 2D COF single crystals. Here, we take a different perspective to explore the 2D COF growth process by tracing growth intermediates. We discover two different growth mechanisms, nucleation and self-healing, in which self-assembly and pre-arrangement of monomers and oligomers are important factors for obtaining highly crystalline 2D COFs. These findings enable us to grow micron-sized 2D single crystalline COF Py-1P. The crystal structure of Py-1P is successfully characterized by three-dimensional electron diffraction (3DED), which confirms that Py-1P does, in part, adopt the widely predicted AA stacking structure. In addition, we find the majority of Py-1P crystals (>90%) have a previously unknown structure, containing 6 stacking layers within one unit cell.
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