Microporous thin films composed either of zeolite crystals embedded in sol-gel derived
glass or of a molecular coupling layer, zeolite crystals and a porous silica overlayer, were
formed on the gold electrodes of Quartz Crystal Microbalances (QCM). The microporosity of
the thin films was characterized by in situ nitrogen and vapor sorption isotherms. Both
preparation methods result in thin films with substantial microporosity. Selective adsorption
based on molecular size exclusion from the microporous films could be achieved
