Growth of high-quality covalent organic framework nanosheets at the interface of two miscible organic solvents†,Nanoscale Horizons

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Growth of high-quality covalent organic framework nanosheets at the interface of two miscible organic solvents†
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7nh00172j
Yang Li _{1,

2,

3} , Meicheng Zhang _{1,

2,

3} , Xinghua Guo _{1,

2,

3} , Rui Wen _{1,

2,

3} , Xing Li _{1,

2,

3} , Xiaofeng Li _{1,

2,

3} , Shoujian Li _{1,

2,

3} , Lijian Ma _{1,

2,

3}

Affiliation

Stronger covalent bonds between monomers, relatively more complex growth processes (polymerization, crystallization, assembly, etc.) and π–π stacking interactions between adjacent layers make it extremely difficult to obtain highly ordered crystalline 2D covalent organic framework (COF) nanosheets. So more effective solutions have to be developed to push the methods reported so far beyond their inherent limitations. Herein, we report the first example of growing high-quality 2D COF nanosheets (NS-COF) at the interface of two miscible organic solvents. The novel approach, which is named as a buffering interlayer interface (BII) method, can be achieved by simply adding a low-density solvent interlayer, as a buffer layer, between the two miscible main solvents based on the self-propelled directed motion of the interface driven by the density differences among the solvents involved. The as-synthesized NS-COF exhibits a super-large size and a relatively regular shape with a smooth surface, which have not been observed before. The proposed strategy offers a facile and effective approach for growing well-structured 2D COF nanosheets and also other kinds of nanosheets.

中文翻译：

在两种可混溶的有机溶剂的界面上生长高质量的共价有机骨架纳米片†

单体之间较强的共价键，相对较复杂的生长过程（聚合，结晶，组装等）。）和相邻层之间的π-π堆叠相互作用使获得高度有序的2D共价有机晶体骨架（COF）纳米片变得极为困难。因此，必须开发更有效的解决方案，以使所报道的方法远远超出其固有的局限性。本文中，我们报告了在两种可混溶有机溶剂的界面处生长高质量2D COF纳米片（NS-COF）的第一个示例。这种新方法被称为缓冲层间界面（BII）方法，可以通过基于两种材料的自驱动定向运动，在两种可混溶的主溶剂之间简单地添加一个低密度溶剂中间层作为缓冲层来实现。界面是由所涉及溶剂之间的密度差异驱动的。合成后的NS-COF具有超大尺寸和相对规则的形状，具有光滑的表面，这是以前从未观察到的。所提出的策略为生长结构良好的2D COF纳米片以及其他种类的纳米片提供了一种简便而有效的方法。

更新日期：2018-01-15

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