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(a) TEM image of ZIF67@ZIF8 and corresponding elemental mapping of (b) Co, (c) Zn, and (d) the layered image of panels a–c, (e) SEM image of PA ZIF67@ZIF8, (f, g) TEM image of PA-ZIF67@ZIF8 and corresponding elemental mapping of (h) Zn, (i) Co, (j) P, and (k) N.
