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Abstract: In this paper, we have prepared the fluorescent silica nanoparticles (FSNPs) covalently doped with rhodamine B (RB) dye molecules via 3-aminopropyltriethoxysilane (APTES) in reverse microemulsion method. Then by the cohydrolysis and polymerization of tetraethoxysilane (TEOS) and APTES, the surface of the FSNPs formed another thin silica shell with the functionalized amino groups. The resulting nanoparticles were characterized by infrared (IR) spectrum, transmission electron microscopy (TEM), and spectrofluorimetry. TEM showed that the particles with diameters in the range of 70–500nm were obtained, with core and shell sizes controlled by varying component content. At the same time, the effect of RB content on the fluorescent properties of the FSNPs was studied, and the results indicated that the fluorescence intensity of the FSNPs could be precisely tuned by varying the doping amount of RB dyes. Finally, the dye leakage was also tested, displaying that RB molecules would not leak out from the silica nanoparticles after dispersing in the aqueous solution. [Copyright &y& Elsevier]