Preparation of a new core-shell Ag@SiO2 nanocomposite and its application for fluorescence enhancement |
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| Authors: | Liangqia Guo |
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| Institution: | Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, China |
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| Abstract: | Ag@SiO2 nanoparticles with different shell thicknesses were synthesized via modified Stöber method. Rhodamine B isothiocyanate was covalently bound onto the surface of Ag@SiO2 nanoparticles to form fluorescent core-shell Ag@SiO2 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 75 nm 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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| Keywords: | Core-shell Ag@SiO2 nanoparticle Fluorescence enhancement Metal-enhanced fluorescence Rhodamine B isothiocyanate |
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