Xu Qizhi, Zhang Boyuan, Zeng Yihang, Zangiabadi Amirali, Ni Hongwei, Chen Rongsheng, Ng Fay, Steigerwald Michael L, Nuckolls Colin
The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology Wuhan 430081 China
Department of Chemistry, Columbia University New York New York 10027 USA.
Chem Sci. 2021 Jan 14;12(8):2955-2959. doi: 10.1039/d0sc05602b.
Electroactive macrocycle building blocks are a promising route to new types of functional two-dimensional porous organic frameworks. Our strategy uses conjugated macrocycles that organize into two dimensional porous sheets non-covalent van der Waals interactions, to make ultrathin films that are just one molecule thick. In bulk, these two-dimensional (2D) sheets stack into a three-dimensional van der Waals crystal, where relatively weak alkyl-alkyl interactions constitute the interface between these sheets. With the liquid-phase exfoliation, we are able to obtain films as thin as two molecular layers. Further using a combination of liquid-phase and mechanical exfoliation, we are able to create non-covalent sheets over a large area (>100 μm). The ultrathin porous films maintain the single crystal packing from the macrocyclic structure and are electrically conductive. We demonstrate that this new type of 2D non-covalent porous organic framework can be used as the active layer in a field effect transistor device with graphene source and drain contacts along with hexagonal boron nitride as the gate dielectric interface.
电活性大环结构单元是通往新型功能性二维多孔有机框架的一条很有前景的途径。我们的策略是使用通过非共价范德华相互作用组装成二维多孔片层的共轭大环，来制备仅一个分子厚的超薄膜。在本体状态下，这些二维片层堆积成三维范德华晶体，其中相对较弱的烷基 - 烷基相互作用构成了这些片层之间的界面。通过液相剥离，我们能够获得薄至两个分子层的薄膜。进一步结合液相和机械剥离，我们能够在大面积（>100μm）上制备非共价片层。这种超薄多孔薄膜保持了大环结构的单晶堆积并且具有导电性。我们证明了这种新型的二维非共价多孔有机框架可以用作场效应晶体管器件的活性层，该器件具有石墨烯源极和漏极接触以及六方氮化硼作为栅极介电界面。
