Figure 2
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Characterizations of hollow ZIF-7 sphere. (a) Molecular structure of Zn-benzimidazole complex. Red spheres, zinc; grey, carbon; blue, nitrogen; white, hydrogen. (b) SEM image of solid amorphous ZIF-7. (c) TEM image of solid amorphous ZIF-7. (d) SEM image of hollow amorphous ZIF-7. (e, f) TEM images of hollow amorphous ZIF-7. (g) PXRD patterns of pristine and hollow amorphous ZIF-7. (h) FT-IR spectra of pristine and hollow amorphous ZIF-7.
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