A quinoline group modified Fe3O4@SiO2 nanoparticles for sequential detection of Zn2+ and hydrogen sulfide in aqueous solution and its logic behavior

A highly selective and sensitive method for recognition of Zn 2+ and hydrogen sulfide (H 2 S) in aqueous solution has been developed by using a quinoline fluorescent sensor functionalized magnetic silica nanoparticles ( R1 ). The chemosensor R1 shows excellent fluorescence sensitivity and selectivity toward Zn 2+ and H 2 S in aqueous media , and displays off–on–off type fluorescence change with alternately adding Zn 2+ and H 2 S to the media along with reversible association–dissociation of the complex. Furthermore, the magnetic nanocomposites can be easily separated from solutions by adding an external magnetic field . Finally, using Zn 2+ and H 2 S as inputs and the fluorescence intensity as output, an INHIBIT logic gate can be constructed at the nanoscale level.