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A Two‐Dimensional Polyimide‐Graphene Heterostructure with Ultra‐fast Interlayer Charge Transfer
Author(s) -
Liu Kejun,
Li Jiang,
Qi Haoyuan,
Hambsch Mike,
Rawle Jonathan,
Vázquez Adrián Romaní,
Nia Ali Shaygan,
Pashkin Alexej,
Schneider Harald,
Polozij Mirosllav,
Heine Thomas,
Helm Manfred,
Mannsfeld Stefan C. B.,
Kaiser Ute,
Dong Renhao,
Feng Xinliang
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202102984
Subject(s) - graphene , materials science , perylene , monolayer , heterojunction , polyimide , chemical physics , nanotechnology , photochemistry , optoelectronics , molecule , chemistry , organic chemistry , layer (electronics)
Two‐dimensional polymers (2DPs) are a class of atomically/molecularly thin crystalline organic 2D materials. They are intriguing candidates for the development of unprecedented organic–inorganic 2D van der Waals heterostructures (vdWHs) with exotic physicochemical properties. In this work, we demonstrate the on‐water surface synthesis of large‐area (cm 2 ), monolayer 2D polyimide (2DPI) with 3.1‐nm lattice. Such 2DPI comprises metal‐free porphyrin and perylene units linked by imide bonds. We further achieve a scalable synthesis of 2DPI‐graphene (2DPI‐G) vdWHs via a face‐to‐face co‐assembly of graphene and 2DPI on the water surface. Remarkably, femtosecond transient absorption spectroscopy reveals an ultra‐fast interlayer charge transfer (ca. 60 fs) in the resultant 2DPI‐G vdWH upon protonation by acid, which is equivalent to that of the fastest reports among inorganic 2D vdWHs. Such large interlayer electronic coupling is ascribed to the interlayer cation–π interaction between 2DP and graphene.