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Synthesizing large-area ultrathin two-dimensional (2D) nanostructures in aqueous media has received considerable increasing attention but remains a big challenge. Herein, we report a facile method for the synthesis of two unprecedented large-area ultrathin 2D supramolecular nanosheets via ionic self-assembly in water. Upon consideration of electrostatic interaction and repulsive effect, deprotonated tetrakis(4-carboxyphenyl)porphyrin (TCPP) or Fe(III) tetra(4-carboxyphenyl)porphine chloride (TCPP(Fe)) as connection vertex and protonated bis(2-dimethylaminoethyl) ether (BDMAEE) unit as bridging edge connect with each other to form few-layer 2D nanosheet with a thickness of ~ 1.8-1.9 nm, while the lateral size can close to one hundred micrometers. Moreover, the well-dispersed 2D TCPP(Fe)-BDMAEE with heme-like active center displays intrinsic peroxidase-like catalytic activity, which can be used to detect hydrogen peroxide. The present facile strategy highlights new opportunities in constructing large-area ultrathin 2D supramolecular nanomaterials and paves the avenue to expand their potential applications.
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (NSFC) (No. 51733003).