Natively porous films as halide anion fluorescence optical sensors

Publication date: Available online 11 January 2016
Source:Thin Solid Films
Author(s): Laura Brigo, Anna Pistore, Luca Baù, Maria Arduini, Fabrizio Mancin, Giovanna Brusatin
A halogen-anion fluorescent solid-state sensor based on natively porous films doped with a quinolinium derivative is reported. The sensitive films are prepared with a low temperature sol–gel synthesis starting from bridged silsesquioxane precursors, and 6-methoxyquinolinium moieties are covalently linked to the organic–inorganic hybrid network. This sensor system is reversible and allows selective detection and measurement of halogen anion concentrations in the physiological range by a dynamic quenching effect of the sensitive fluorophore. The quenching constants are unaffected by dye inclusion in the bridged polysilsesquioxane matrix.