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a) Chemical structure of three COFs with different linkages. b–d) Simulated crystal structure of many layers of COF–alkene, COF–imide, and COF–imine, respectively. PXRD patterns of e) COF–alkene, f) COF–imide, and g) COF–imine, SEM images of h) COF–alkene, i) COF–imide, and j) COF–imine, respectively.
