The fabrication of ZIFs-based membranes requires support or substrate. The judicious choice of substrate is important during the synthesis of ZIFs-based membrane. Several substrate were reported including ceramic , ionic liquids membrane , and polymeric-based materials. Ceramic supports including α-alumina , titania , yttria-stabilized zirconia (YSZ) , ZnO , and SiO2 were reported. α-alumina was the commonly used ceramic substrate. It offers excellent mechanical stability, and for this reason, it is the most commonly preferred ceramic-based substrate. Some of these ceramics show excellent mechanical and thermal stability. Ceramic such as titania can promote heterogeneous nucleation. However, titania is expensive and brittle leading to broken during the gas adsorption . Support of two different substrates such as α-alumina and titania was also described to combine the high mechanical stability of α-alumina and the smooth appearance of titania .