Fig. 2: Characterizations of COFs-NS.
From: Engineering β-ketoamine covalent organic frameworks for photocatalytic overall water splitting

a PXRD patterns of TpBpy-NS, TpBpy-2-NS, and TpBD-NS. b TEM image, c AFM image of Pt@TpBpy-NS. Scale bar: 50 nm. d UV–Vis DRS, and (ahv)2 versus hv curve of TpBpy-NS, TpBpy-2-NS, and TpBD-NS. e UPS spectra of TpBpy-NS. f Band structure of TpBpy-NS, TpBpy-2-NS, and TpBD-NS.