Fig. 2: Preparation and characterizations of iCOF nanosheets and iCOFMs.
From: Short hydrogen-bond network confined on COF surfaces enables ultrahigh proton conductivity
a Topological structures of the iCOFs with twelve and six -SO3H groups on each hexagonal unit, respectively(the green ellipse represents the -SO3H groups distance). b Scheme of the -SO3H group distance in iCOFs skeleton. c TEM image of the iCOF nanosheets (scale bar, 500 nm, 2 nm). The upper and lower insets display the photograph of the iCOFs nanosheet solution and the HRTEM image of iCOFs nanosheets, respectively. d Scheme of the preparation of iCOFM. The upper and lower inserts display the photograph and laminated structure of iCOFM, respectively. e The GIWAXs data of TpBd-SO3H. f SEM image of iCOFM (scale bar, 10 μm, 1 μm). The insert shows the AFM image of iCOFM. g SEM image of cross-section of the iCOFM (scale bar, 1 μm). The inserts show the photographs of folded iCOFM. h TEM image of the cross-section of the iCOFM (scale bar, 50 nm). The inset shows the magnified image (scale bar, 2 nm). Source data are provided as a Source Data file.
