Figure 2

SEM images of the different ZIF-8 samples prepared at Hmim/Zn molar ratio of (A) 1, (B) 2, (C) 4, (D) 8, (E) 16 and elemental mapping of ZIF-8 with Hmim/Zn molar ratio of 8.
SEM images of the different ZIF-8 samples prepared at Hmim/Zn molar ratio of (A) 1, (B) 2, (C) 4, (D) 8, (E) 16 and elemental mapping of ZIF-8 with Hmim/Zn molar ratio of 8.