Distance Dependence of Fluorescence Enhancement in Au Nanoparticle@Mesoporous Silica@Europium Complex

In this paper, a core–shell structure of Au nanoparticle @mSiO 2 with controllable thickness of silica was synthesized by a modified one-pot process and then europium complex of PABI-Eu was grafted on the surface of Au nanoparticle @mSiO 2 nanostructure to successfully construct the resulting Au nanoparticle @mSiO 2 @PABI-Eu nanocomposite. The spectroscopic result revealed that the emission intensity of the Au nanoparticle @mSiO 2 @PABI-Eu nanocomposite is highly dependent on the thickness of silica. The enhancement factor of 4.20 is achieved at 30 nm thickness of silica between Au nanoparticle and PABI-Eu complex.