Direct synthesis of CVD-graphene membrane on porous Matrimide for gas separation applications
Volume Title: 1
1Chemical Enginnering Department, Tarbiat Modares University, Tehran, Iran
2Nuclear fuel cycle research, iran atomic energy organization.
3School of Chemical Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
4School of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran
In this research, we have fabricated large scale graphene membrane on porous Matrimide for helium/methane gas separation. Graphene film was synthesized using low pressure chemical vapor deposition (LPCVD) method on the surface of a copper foil. Raman analysis confirms the graphene film is mostly monolayer. The porous Matrimide substrate was also directly produced on the graphene-covered copper foil using spin coating method accompanying the phase inversion process in a methanol bath and then etching away of the copper foil. We applied the prepared graphene membrane for Helium separation from Methane. FESEM analysis implies the strong adhesion of Matrimide to the graphene film owing to its net positive charge. Furthermore, gas separation results reveal that after direct graphene transfer to the porous Matrimide, permeance drops for both gases while the Helium/Methane selectivity increases by ~60%. The current work could enhance the quality of the graphene membranes for separation processes and also could pave the challengable path of the graphene transfer to polymeric substrates.