Covalent organic nanosheets with large lateral size and high aspect ratio synthesized by Langmuir-Blodgett method

Abstract

Two-dimensional (2D) materials have attracted increasing attentions recently due to their unique physical and chemical properties. We herein report the synthesis of four chemically stable 2D covalent organic nanosheets (CONs) with large lateral sizes (up to 200 μm) and high aspect ratios (>20 000) at the air-water interface through the Langmuir-Blodgett method. These CONs exhibit good crystallinity proved by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). In addition, the hydrophobicity of these CONs can be systematically adjusted by the introduction of various functional groups, making them suitable as functional coating and membrane materials.