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Field emission scanning electron microscope (FESEM) images of (a) ZIF-8 nanoparticles; and cross-sections of (b) pure PVA; (c) PVA/25.4% ZIF-8; (d) PVA/40.5% ZIF-8; and (e) PVA/45.4% ZIF-8 composites (insert figures show higher-magnification views of cross-sections of PVA/ZIF-8 composites).
