Facile scalable fabrication of triazine-based flexible covalent organic framework fiber film with multifunction at room temperature

Abstract

Flexible covalent organic framework (COF) film has drawn much attention as a promising functional material due to their unique molecular structure and self-supporting property. However, the traditional solvothermal method of synthesizing flexible COF film is usually complicated, long-term duration and energy-consuming, making it unsuitable for scalable preparation. To address these limitations, a new method combining electrospinning and sacrificial template is proposed to quickly produce triazine-based COF fiber films at room temperature. The method is easy to operate and has a short reaction time (minimum 0.5 h) without dehydration and deoxygenation processes at room temperature, making it suitable for large-scale production (20 cm × 30 cm). Different from the unprocessable of COF powder, COF films not only have good flexibility and mechanical properties, but also can be patterned with multiple functions to adapt to various application scenarios. Moreover, the functionality of triazine-structured COF is retained, enabling the use of the films in energy conversion and storage applications. Triazine-based COFs naturally have scalable conjugated structure, thus showing potential photocatalytic probability. Furthermore, the large pore structure of COF films enables loading of phase change materials endowing comprehensive properties of thermal management and flame retardance. This study proposes a strategy for the rapid synthesis of COF fiber films at room temperature and paves the way for multifunctional and high-performance COF based materials.