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A class of hydrophilic, photostable, biocompatiable, and highly fluorescent streptavidin-functionalized silica nanoparticles were developed, in which Rhodamine B isothiocyanate molecules were covalently embedded by using Stöber method. The silica nanoparticles were ∼60 nm in size and had average fluorescence intensity 4000 times higher than dye molecules. To reduce the severe aggregation, silica nanoparticles...
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