Lee W.-C.Chien H.-T.Lo Y.Chiu H.-C.Wang T.-P.Kang D.-Y.2019-05-222019-05-22201519448244https://scholars.lib.ntu.edu.tw/handle/123456789/409781Zeolitic imidazolate frameworks (ZIFs) are an emerging class of microporous materials that possess an organic flexible scaffold and zeolite-like topology. The catalytic and molecular-separation capabilities of these materials have attracted considerable attention; however, crystal-shape engineering in ZIF materials remains in its infancy. This is the first study to report an effective method for tailoring the near-spherical crystal morphology of ZIF-8 using its leaf-like pseudopolymorph, ZIF-L. A thin, uniform layer of ZIF-8 is formed on ZIF-L through heterogeneous surface growth to produce a ZIF-L@ZIF-8 core-shell nanocomposite. This results in ZIF-8 with a crystal morphology comprising two-dimensional nanoflakes. We characterized the resulting core-shell crystals using a number of solid-state techniques, including powder X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and nitrogen physisorption. Approximately 16 mass% of ZIF-8 in the core-shell composites heterogeneous surfacely grown on ZIF-L core crystals. We also investigated the effects of zinc salts, which were used as a source of zinc in the formation of the ZIF-L@ZIF-8 core-shell nanocomposites. Finally, we assessed the CO<inf>2</inf> adsorption properties of ZIF-8, ZIF-L, and ZIF-L@ZIF-8 core-shell crystals, the results of which were used to deduce the dynamic and equilibrium adsorption characteristics of various microporous ZIF crystals. The core-shell materials present hybridized CO<inf>2</inf> uptake and diffusivity of the parent crystals. The proposed method for the synthesis of core-shell nanocomposites using pseudopolymorphic crystals is applicable to other ZIF systems. (Figure Presented). ? 2015 American Chemical Society 2015.CO<inf>2</inf> adsorptioncore-shell crystalnanocompositepseudopolymorphzeolitic imidazolate frameworkjournal article10.1021/acsami.5b042172-s2.0-84940516463https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940516463&doi=10.1021%2facsami.5b04217&partnerID=40&md5=21c78ea8b26ee6876df22d027509392d