Thickness-Driven Synthesis and Applications of Covalent Organic Framework Nanosheets.

Covalent organic frameworks (COFs) are two-dimensional, crystalline porous framework materials with numerous scopes of tunability like porosity, functionality, stability and aspect ratio (thickness to length ratio). The manipulation of π-stacking in COFs results in truly 2D materials, namely covalent organic nanosheets (CONs) adds advantages in many applications. In this review, we have discussed both top-down (COFs→CONs) and bottom-up (molecules→CONs) with precise information on thickness and lateral growth. We have showcased the research progress of CONs in few selected applications like batteries, catalysis, sensing and biomedical applications. This review specifically highlights the reports where the authors compare the performance of CONs with COFs by demonstrating the impact of thickness and lateral growth of the nanosheets. Eventually, we have provided the possible scope of exploration of CONs research in terms of inter-dimensional conversion like graphene to carbon nanotube and future technologies..