Magnetic nanocomposites of Fe3O4/SiO2-FITC with pH-dependent fluorescence emission

This paper describes the formation of magnetic and fluorescent nanocomposite particles which consist of superparamagnetic Fe3O4 core, SiO2 shell and organic dye (FITC) coating layer on their surface. The obtained nanocomposites possess typical superparamagnetism and exhibit clear green fluorescence image. And their fluorescence emission is pH-dependent, which would be applied to pH sensing.