The morphology of ZIF materials exhibits an insignificant effect on CO2 adsorption . The low and high aspect ratio ZIF-78 showed similar CO2 adsorption behavior . However, leaf-like ZIF (ZIF-L) with 2D morphology exhibited high CO2 adsorption. This observation is due to the cushion-like pore of ZIF-L (Figure ). The vibrational properties of ZIFs materials such as ZIF-68 and ZIF-69 . The high CO2 uptake causes high free-breathing vibrations of the ligands, causing the large ZIF pores .