To demonstrate MOF-based kinetic selectivity sensing, ZIF-8 was selected since this material has a high affinity for VOCs and thin film deposition strategies are well-developed . ZIF-8 has a three-dimensional cage-and-window pore space in which the narrow window aperture controls diffusion. Moreover, because of its flexibility, ZIF-8 does not exhibit a sharp size cutoff for VOCs that can enter the pores. This is beneficial since larger molecules can still enter, yet their diffusivity strongly depends on their size and thus can be used to discriminate between VOCs.