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Spherical silica nanoparticles coated with fluorescein isothiocyanate (FITC) dyes were prepared by using an improved Stöber method. The nanoparticles were ∼55nm in diameter and were essentially mono-dispersed in aqueous solutions. The fluorescence excitation and emission spectra of the nano-composite particles showed no obvious shift compared with that of the free FITC in the aqueous solution. The...
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