| In present work, both thickness of the silica shell and diameter of Ag core are investigated by tuning the changes in fluorescence enhancement and lifetime. In this work, develop core-shell (silver core-silica shell) nanoparticles with various shell thickness of around3±1nm,24±2nm,32±3nm,52±3nm,55±2nm,24±3nm and44±2nm, and characterize their morphology. Twenty rare earth complexes are synthetized in alcohol solution. In this paper, also develop to prepare rare earth complexes dope core-shell silica nanoparticles employing silver NPs as the core material and silica coating produced from the hydrolysis TEOS (tetraethyl orthosilicate) in the alcohol solution. Results demonstrate that when the thickness is24±2nm, the enhancement is the strongest. Our studies show that these additives enhance the emission intensity, the enhancement of terbium can reach26.35-fold and europium can reach6.04-fold.These works show the versatility of the core-shell structure, and that after some modifications, fluorescence enhancement can be achieved with appreciable advantages. The reason of observed enhancement is attributed to the decrease of the solvent quenching effect. And the adsorption of the silica shell is also affect the fluorescence intensity. |
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