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Figure 2
SEM images of (a) the as-synthesized ZIF-8 nanocrystals and (b) the ZIF-8@ZIF-67 core-shell nanostructure. (c) TEM image of ZIF-8@ZIF-67 and (d) XRD patterns of ZIF-8, ZIF-67 and ZIF-8@ZIF-67. Digital photographs of (e) ZIF-8, (f) ZIF-8@ZIF-67 and (g) ZIF-67 samples. |