On-Surface Synthesis and Applications of 2D Covalent Organic Framework Nanosheets

Covalent organic framework nanosheets (COF nanosheets) are two-dimensional crystalline porous polymers with in-plane covalent bonds and out-of-plane Van der Waals forces. Owing to the customizable structure, chemical modification, ultra-high porosity, COF show many fascinating properties unique traditional materials, have shown potential applications in gas separation, sensors, electronic, optoelectronic devices. This minireview aims illustrate recent progress on nanosheets, from two aspects of on-surface synthesis applications. We first review at gas–solid interface. On-surface under ultrahigh vacuum vapor highlighted. In addition, we also liquid–solid interface various substrates, i.e., both amorphous substrates. Beyond synthesis, highlight state-of-the-art particularly charge transport, separation.