Fig. 2From: Classification, Synthesis, and Application of Luminescent Silica Nanoparticles: a Reviewa The mechanism of FSNP-1, FSNP-2, FSNP-3, and FSNP-4. b The normalized intensity in different pH values of all the samples. c Emission intensity of the FSNPs and free dyes. d Showing after incubated with FSNPs for 24 h, the viability of the raw264.7 macrophage cells [23]Back to article page