近日，新加坡国立大学教授Kian Ping Loh及其团队报道了二维共价有机骨架超晶格。这一研究成果于2025年2月20日发表在国际顶尖学术期刊《自然-化学》上。

本文描述了一种通过单体直接缩合在液-底界面合成二维聚合物双层或双层二维共价有机框架的方法。更重要的是，该课题组人员还展示了单体结构和溶剂混合物等因素如何影响双层堆叠模式，以及在某些条件下，如何从扭曲的双层堆叠中产生大面积的波纹超晶格。这一发现为设计具有可调谐电子和结构特性的双层堆叠框架材料提供了新的机会。

据悉，从单体表面合成二维（2D）聚合物代表了一种设计晶格、轨道和自旋对称的主题策略。像其他二维材料一样，二维聚合物有序堆叠成双层可以开发出在单个层中没有的独特光电、电荷传输和磁性能。然而，控制二维聚合物的层堆叠仍然具有挑战性。

附：英文原文

Title: Moiré two-dimensional covalent organic framework superlattices

Author: Zhan, Gaolei, Koek, Brecht, Yuan, Yijia, Liu, Yikuan, Mishra, Vipin, Lenzi, Veniero, Strutyski, Karol, Li, Chunxiao, Zhang, Rongrong, Zhou, Xin, Choi, Hwa Seob, Cai, Zhen-Feng, Almarza, Joaqun, Mali, Kunal S., Mateo-Alonso, Aurelio, Franco, Manuel Melle, Zhu, Yihan, De Feyter, Steven, Loh, Kian Ping

Issue&Volume: 2025-02-20

Abstract: The on-surface synthesis of two-dimensional (2D) polymers from monomers represents a useful strategy for designing lattice, orbital and spin symmetries. Like other 2D materials, the ordered stacking of 2D polymers into bilayers may allow developing unique optoelectronic, charge transport and magnetic properties not found in the individual layers. However, controlling layer stacking of 2D polymers remains challenging. Here we describe a method for synthesizing 2D polymer bilayers or bilayer 2D covalent organic frameworks at the liquid–substrate interface through the direct condensation of monomers. More importantly, we also show how factors such as monomer structure and solvent mixture influence the bilayer stacking modes and how, under certain conditions, large-area moiré superlattices emerge from the twisted bilayer stacking. This finding offers new opportunities for the design of bilayer stacked framework materials with tunable electronic and structural properties.

DOI: 10.1038/s41557-025-01748-5

Source: https://www.nature.com/articles/s41557-025-01748-5