Journal
TALANTA
Volume 82, Issue 5, Pages 1696-1700Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2010.07.051
Keywords
Core-shell Ag@SiO2 nanoparticle; Fluorescence enhancement; Metal-enhanced fluorescence; Rhodamine B isothiocyanate
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Funding
- National Basic Research Program of China [2010CB732403]
- NSFC [50503006, 20735002, 40940026]
- Science Foundation of Fujian Province of China [2008J0149]
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Ag@SiO2 nanoparticles with different shell thicknesses were synthesized via modified Stober 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 similar to 5-folds. Further increasing of fluorophore-metal distance caused a decrease in the enhancement factor. (C) 2010 Elsevier B.V. All rights reserved.
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