Fig. 3.

COMs preparation by in situ growth strategy. (a) Schematic synthesis of COF coating on modified SSN substrate; (b) SEM image of 3@SSN coating; (c) the water contact angle of 3@SSN [49]; (d) preparation of the SCOF membrane grafted on silicon wafers and the free-standing SCOF membrane; (e) SEM image of the free-standing SCOF [50]; (f) free-standing COMs grow on ITO substrate and (g) the surface SEM image of COMs [52]. Panels reprinted with permission from: a–c, ref. [49], John Wiley and Sons; d–e, ref. [50], John Wiley and Sons; f–g, ref. [52], Springer Nature. ITO, indium tin oxide; SCOF, sulfonic COF; SSN, stainless-steel net.