fig4

Figure 4. (A) Fabrication process of 2D COF membranes using microcrystalline powder of COF-43 via exfoliation methods. (B) AFM images of 2D COF-43. Left: COF-43 treated with THF; right: COF-43 treated with dioxane. Reproduced with permission. Copyright 2013, American Chemical Society^[65]. (C) Schematic diagram illustrating fabrication of heterostructure 2D COFs via in-situ growth and linker exchange methods. (D) Structural transformation of 2D COF membrane as a function of synthesis time. Reproduced with permission. Copyright 2022, Royal Society of Chemistry^[66].