Fig. 2: Characterization of TpPa-SO3H COF nanosheets.
From: Covalent organic framework membrane with hourglass-shaped nanochannels for ultrafast desalination
a Solid-state ¹³C NMR spectra; b XRD pattern; c N2 adsorption-desorption isotherm; d TEM image, HRTEM image in the upper insets and elemental mapping in the lower insets; e AFM image, the height data shown in the inset.
