Fig. 3: Time-course line scan, mapping, and porosity of the HOF | MOF-xh with the 1D axial heterostructure.

a SEM-EDS line scan of single crystals for Cu element along the c axis of HOF | MOF-xh (x = 0, 2.5, 6, 20, and 48). b The proposed changes to the single crystals. Atom colors: C, gray; N, blue; H, white; Cu, red. SEM-EDS line scan and EDS mapping of (c) the HOF | MOF-2.5 h and (d) HOF | MOF-6h crystals along the ab plane. Scale bar: 1 µm. e BET surface areas of HOF | MOF-xh (x = 0.5, 2.5, 10, 15, 20, and 48), and (f) NLDFT calculated pore size distribution.