Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Self-exfoliation of 2D covalent organic frameworks: morphology transformation induced by solvent polarity†
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1039/c7ra09647j Na Zhang 1 , Taisheng Wang 1 , Xing Wu 1 , Chen Jiang 1 , Fang Chen 1 , Wei Bai 2 , Ruke Bai 1
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1039/c7ra09647j Na Zhang 1 , Taisheng Wang 1 , Xing Wu 1 , Chen Jiang 1 , Fang Chen 1 , Wei Bai 2 , Ruke Bai 1
Affiliation
|
Recently, covalent organic nanosheets (CONs) have emerged as functional two-dimensional (2D) materials for versatile applications. Strong interaction among layers and the instability of borate ester in moisture are the major hurdles to obtain few layered boron-containing CONs by exfoliation of their bulk counterparts. In this paper, we report a facile approach for preparation of few layered borate ester-containing CONs based on electrostatic repulsion of ions. We incorporated organic ionic groups into porous covalent organic frameworks (COFs) and it has been proved that the COFs with quaternary ammonium group could self-exfoliate into few layered ionic covalent organic nanosheets (iCONs) in polar organic solvents. Interestingly, the morphology of the iCOFs-A could be changed from a multilayered aggregation to nanocapsules, or 2D sheets when solvents with different polarity were used. In contrast, non-ionic covalent organic frameworks COFs-B could not self-exfoliate in various solvents. In addition, the self-exfoliated nanosheets could be used to fabricate uniform thin films on SiO2 wafer and the film exhibited explicit optical and electrical properties.
中文翻译：
二维共价有机框架的自剥离：溶剂极性诱导的形态转变†
最近，共价有机纳米片 (CONs) 已成为多功能应用的功能二维 (2D) 材料。层间的强相互作用和硼酸酯在水分中的不稳定性是通过剥离其本体对应物获得少量层状含硼CON的主要障碍。在本文中，我们报告了一种基于离子静电排斥制备少量层状含硼酸酯 CON 的简便方法。我们将有机离子基团结合到多孔共价有机框架（COFs）中，并且已经证明具有季铵基团的COFs可以在极性有机溶剂中自剥离成少数层状离子共价有机纳米片（iCONs）。有趣的是，iCOFs-A的形态当使用不同极性的溶剂时，可以从多层聚集体变为纳米胶囊或二维片材。相比之下，非离子共价有机骨架COFs-B不能在各种溶剂中自剥离。此外，自剥离纳米片可用于在SiO 2晶片上制备均匀的薄膜，并且该薄膜表现出明显的光学和电学性质。
更新日期：2018-01-19
中文翻译：
二维共价有机框架的自剥离：溶剂极性诱导的形态转变†
最近，共价有机纳米片 (CONs) 已成为多功能应用的功能二维 (2D) 材料。层间的强相互作用和硼酸酯在水分中的不稳定性是通过剥离其本体对应物获得少量层状含硼CON的主要障碍。在本文中，我们报告了一种基于离子静电排斥制备少量层状含硼酸酯 CON 的简便方法。我们将有机离子基团结合到多孔共价有机框架（COFs）中，并且已经证明具有季铵基团的COFs可以在极性有机溶剂中自剥离成少数层状离子共价有机纳米片（iCONs）。有趣的是，iCOFs-A的形态当使用不同极性的溶剂时，可以从多层聚集体变为纳米胶囊或二维片材。相比之下，非离子共价有机骨架COFs-B不能在各种溶剂中自剥离。此外，自剥离纳米片可用于在SiO 2晶片上制备均匀的薄膜，并且该薄膜表现出明显的光学和电学性质。
京公网安备 11010802027423号