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  • Title: Preparation of a new core-shell Ag@SiO2 nanocomposite and its application for fluorescence enhancement.
    Author: Guo L, Guan A, Lin X, Zhang C, Chen G.
    Journal: Talanta; 2010 Oct 15; 82(5):1696-700. PubMed ID: 20875565.
    Abstract:
    Ag@SiO(2) nanoparticles with different shell thicknesses were synthesized via modified Stöber method. Rhodamine B isothiocyanate was covalently bound onto the surface of Ag@SiO(2) nanoparticles to form fluorescent core-shell Ag@SiO(2) nanocomposites. Effects of shell thickness on the fluorescence enhancement were examined using the corresponding nanobubbles prepared by cyanide etching as a control. The result showed that the fluorescence enhanced as the shell thickness increased till the distance between fluorophore and metal core reached about 75nm with the optimal enhancement factor of ∼5-folds. Further increasing of fluorophore-metal distance caused a decrease in the enhancement factor.
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