Zhang Xin, Li Xiaoyin, Cheng Zhengwang, Chen Aixi, Wang Pengdong, Wang Xingyue, Lei Xiaoxu, Bian Qi, Li Shaojian, Yuan Bingkai, Gao Jianzhi, Li Fang-Sen, Pan Minghu, Liu Feng
School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710119, China.
Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT, 84112, USA.
Nat Commun. 2024 Jul 15;15(1):5934. doi: 10.1038/s41467-024-50211-5.
The current strategies for building 2D organic-inorganic heterojunctions involve mostly wet-chemistry processes or exfoliation and transfer, leading to interface contaminations, poor crystallizing, or limited size. Here we show a bottom-up procedure to fabricate 2D large-scale heterostructure with clean interface and highly-crystalline sheets. As a prototypical example, a well-ordered hydrogen-bonded organic framework is self-assembled on the highly-oriented-pyrolytic-graphite substrate. The organic framework adopts a honeycomb lattice with faulted/unfaulted halves in a unit cell, resemble to molecular "graphene". Interestingly, the topmost layer of substrate is self-lifted by organic framework via strong interlayer coupling, to form effectively a floating organic framework/graphene heterostructure. The individual layer of heterostructure inherits its intrinsic property, exhibiting distinct Dirac bands of graphene and narrow bands of organic framework. Our results demonstrate a promising approach to fabricate 2D organic-inorganic heterostructure with large-scale uniformity and highly-crystalline via the self-lifting effect, which is generally applicable to most of van der Waals materials.
目前构建二维有机-无机异质结的策略主要涉及湿化学过程或剥离与转移，这会导致界面污染、结晶性差或尺寸受限。在此，我们展示了一种自下而上的方法来制备具有清洁界面和高结晶度薄片的二维大规模异质结构。作为一个典型例子，一种有序的氢键有机框架在高度取向热解石墨衬底上自组装。该有机框架采用蜂窝晶格，在一个晶胞中有缺陷/无缺陷的两半，类似于分子“石墨烯”。有趣的是，衬底的最顶层通过强层间耦合被有机框架自提升，从而有效地形成一个浮动的有机框架/石墨烯异质结构。异质结构的单个层继承其固有特性，展现出石墨烯独特的狄拉克带和有机框架的窄带。我们的结果证明了一种通过自提升效应制备具有大规模均匀性和高结晶度的二维有机-无机异质结构的有前景的方法，该方法通常适用于大多数范德华材料。
