Moscoso, Francisco G.Rodríguez-Albelo, Luisa MarlenyRuiz-Salvador, A. RabdelLopes-Costa, TâniaPedrosa Poyato, José María2023-02-172023-02-172023-03Moscoso, F.G., Rodríguez-Albelo, L.M., Ruiz-Salvador, A.R., Lopes-Costa, T. y Pedrosa Poyato, J.M. (2023). Enhancement of the intrinsic fluorescence of ZIF-8 via post-synthetic cation exchange with Cd2+ and its incorporation into PDMS films for selective sulfide optical sensing. Materials Today Chemistry, 28 (101366). https://doi.org/10.1016/j.mtchem.2022.101366.2468-5194https://hdl.handle.net/11441/142773In this study, ZIF-8 MOF nanocrystals were synthesized and post-synthetically modified by applying different cation exchange strategies. Addition of cadmium nitrate in either methanol or DMF followed by either magnetic stirring or gentle heating led to the incorporation of a small amount of Cd (II) ions into the crystal structure in most cases, as clearly demonstrated by several characterization techniques including PXRD, SEM-EDS and FT-IR. This novel doped material exhibits a high fluorescence with the maximum emission wavelength at 444 nm upon excitation at 380 nm, which allows its use as an effective optical sensor. The sensing capability of the Cd-doped ZIF-8 material was demonstrated by its exposure to sulfide ions in aqueous solution. The fluorescence of the doped material was gradually quenched as the concentration of S2− was increased. Sensing devices based on mixed-matrix membranes (MMMs) were fabricated by using poly (dimethyl siloxane) (PDMS) as a hosting matrix for the Cd-doped ZIF-8 crystals, giving rise to fluorescent sensing films with fast and selective responses against a broad number of potential interferents.application/pdf8 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Metal-organic frameworksZeolitic imidazolate frameworksPost-synthetic modificationPhotoluminescenceSensorinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1016/j.mtchem.2022.101366