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(a) Schematic representation of the synthesis of CS-COF. The dotted blue lines on the periphery imply the extension of periodic structures. (b) Graphic representation of one-layer-conjugated skeleton (a 2 × 2 CPK net; grey: carbon, red: nitrogen, tert-butyl groups and H atoms are omitted for clarity). The COF is mesoscopic platelets with lengths and widths extended to 1 μm and thicknesses ranged from 20 to 100 nm.
