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We present the fabrication of one-dimensional photonic crystals (Bragg stacks) based on a microporousmetal–organic framework material and mesoporous titanium dioxide. The Bragg stackheterostructures were obtained using two complementary synthesis approaches utilizing the bottom-upassembly of heterogeneous, i.e. two-component photonic crystal multilayer structures. Zeoliticimidazolate framework ZIF-8 and mesoporous titanium dioxide were chosen as functional componentswith different refractive indices. While ZIF-8 is intended to impart molecular selectivity, mesoporousTiO2 is used to ensure high refractive index contrast and to guarantee molecular diffusion within theBragg stack. The combination of micro- and mesoporosity within one scaffold endows the 1D-MOFPC with characteristic adsorption properties upon exposure to various organic vapors. In this context,the sorption behavior of the photonic material was studied as a function of partial pressure of organicvapors. The results show that the multilayered photonic heterostructures are sensitive and selectivetowards a series of chemically similar solvent vapors. It is thus anticipated that the concept ofmultilayer heterogeneous photonic structures will provide a versatile platform for future selective,label-free optical sensors.

One-dimensional metal–organic framework photonic crystals used as platforms for vapor sorption