Rapid synthesis of ultrathin, defect-free ZIF-8 membranes via chemical vapour modification of a polymeric support

Abstract

Ultrathin ZIF-8 membranes with a thickness of around 200 nm were prepared by chemical vapour modification of surface chemistry and nanopores of an asymmetric bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) substrate. The resulting ZIF-8 membranes exhibited exceptional H₂ permeance as high as 2.05 × 10⁻⁶ mol m⁻² s⁻¹ Pa⁻¹ with high H₂/N₂ and H₂/CO₂ selectivities (9.7 and 12.8, respectively).