ZIFs crystal can be grown via in-situ procedure using modified and unmodified supports. The insitu method involves the growth of ZIFs crystals into porous support. This technique includes the immersion of support into the solution of ZIFs precursors. After a period at a specific temperature, the nucleation of ZIFs crystals starts producing layers of ZIFs crystals. However, the use of unmodified support lacks a high nucleation rate due to functional groups that serve as nucleation sites.