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

    Year: 2023

    Journal: Communications Chemistry, Volume 6, 16/12/2023

    Authors: Prasoon, Anupam; Yang, Hyejung; Hambsch, Mike; Nguyen, Nguyen Ngan; Chung, Sein; Müller, Alina; Wang, Zhiyong; Lan, Tianshu; Fontaine, Philippe; Kühne, Thomas D.; Cho, Kilwon; Nia, Ali Shaygan; Mannsfeld, Stefan C. B.; Dong, Renhao; Feng, Xinliang

    Keywords: Surface assembly; Electronic materials

    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 cm2). 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 cm2/V·s, signifying a substantial improvement over pristine MoS2 (8 cm2/V·s). 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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