title: Preparation of a new core-shell Ag@SiO2 nanocomposite and its application for fluorescence enhancement.
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.
authors.affiliation: 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.
authors.forename: Liangqia
authors.initials: L
authors.lastname: Guo
authors.forename: Anhua
authors.initials: A
authors.lastname: Guan
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Lin
authors.forename: Chunliang
authors.initials: C
authors.lastname: Zhang
authors.forename: Guonan
authors.initials: G
authors.lastname: Chen
mesh_terms: D005456:Fluorescent Dyes / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000295:instrumentation / Q000379:methods; D013056:Spectrophotometry, Ultraviolet; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; D012834:Silver; D012822:Silicon Dioxide; C027755:rhodamine isothiocyanate