fig3

Figure 3. Formation of PCN-128 film coatings with high uniformity. (A) Schematic diagram of PCN-128 film preparation by spray coating; (B) Calculation process for crystals coverage area of PCN-128 film; (C) Particle size distribution histogram of large- and small-particle PCN-128; (D) PXRD patterns of large- and small-particle PCN-128. (E) Images of PCN-128 dispersions in THF with different particle sizes after standing for 24 h (under UV); (F) Emission spectrum (excitation: 365 nm) of a PCN-128 dispersion in THF before and after standing for 32 h. Crystal coverage data (G), SEM (Scale bars: 5 μm), and optical (Scale bars: 1 mm) images (under UV) (H) of PCN-128 films sprayed with crystals of various sizes; (I) Crystal coverage of PCN-128 films and substrate contact angles before and after surface modification of the parylene substrate. SEM and optical images (under UV) of PCN-128 films prepared using a parylene substrate with a hydrophobic (J) and hydrophilic (K) surface. Error bars indicate standard deviation (sample size n = 5). PXRD: Powder X-ray diffraction; THF: tetrahydrofuran; UV: ultraviolet; SEM: scanning electron microscope.