4.6 Article

On-water surface synthesis of electronically coupled 2D polyimide-MoS2 van der Waals heterostructure

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COMMUNICATIONS CHEMISTRY
卷 6, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s42004-023-01081-3

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This study demonstrates an efficient on-water surface synthesis of crystalline monolayer 2D polyimide (2DPI) with excellent stability and coverage. By combining with exfoliated MoS2, innovative organic-inorganic hybrid van der Waals heterostructures (vdWHs) are fabricated, facilitating remarkable charge transfer and improved electron mobility.
The water surface provides a highly effective platform for the synthesis of two-dimensional polymers (2DP). In this study, we present an efficient on-water surface synthesis of crystalline monolayer 2D polyimide (2DPI) through the imidization reaction between tetra (4-aminophenyl) porphyrin (M1) and perylenetracarboxylic dianhydride (M2), resulting in excellent stability and coverage over a large area (tens of cm(2)). We further fabricate innovative organic-inorganic hybrid van der Waals heterostructures (vdWHs) by combining with exfoliated few-layer molybdenum sulfide (MoS2). High-resolution transmission electron microscopy (HRTEM) reveals face-to-face stacking between MoS2 and 2DPI within the vdWH. This stacking configuration facilitates remarkable charge transfer and noticeable n-type doping effects from monolayer 2DPI to MoS2, as corroborated by Raman spectroscopy, photoluminescence measurements, and field-effect transistor (FET) characterizations. Notably, the 2DPI-MoS2 vdWH exhibits an impressive electron mobility of 50 cm(2)/Vs, signifying a substantial improvement over pristine MoS2 (8 cm(2)/Vs). This study unveils the immense potential of integrating 2D polymers to enhance semiconductor device functionality through tailored vdWHs, thereby opening up exciting new avenues for exploring unique interfacial physical phenomena.

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