Abstract

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.

中文翻译：

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水中大面积超薄二维超分子纳米片的简便合成

摘要

在水性介质中合成大面积超薄二维（2D）纳米结构已受到越来越多的关注，但仍然是一个巨大的挑战。在这里，我们报告了一种通过水中离子自组装合成两个前所未有的大面积超薄二维超分子纳米片的简便方法。考虑到静电相互作用和排斥作用，将脱质子化的四（4-羧基苯基）卟啉（TCPP）或Fe（III）四（4-羧基苯基）卟啉氯化物（TCPP（Fe））作为连接顶点并质子化的双（2-二甲基氨基乙基）醚（BDMAEE）单元作为桥接边缘相互连接，形成几层2D纳米片，厚度约为1.8-1.9 nm，而横向尺寸可以接近100微米。此外，具有血红素样活性中心的分散良好的二维TCPP（Fe）-BDMAEE具有固有的过氧化物酶样催化活性，可用于检测过氧化氢。当前的简便策略突显了构建大面积超薄2D超分子纳米材料的新机会，并为扩大其潜在应用铺平了道路。