Silver (Ag) nanoparticles dispersed in an amorphous silica (SiO_2) matrix or coated by a SiO_2layer were synthesized by flame spray pyrolysis (FSP). The coated nanoparticles were producedby using a modified enclosed FSP setup, in which the SiO_2 precursor was injected through a ringabove the FSP nozzle at various burner-ring-distances (BRDs), after the core Ag nanoparticleshad been formed. The produced nanoparticles were characterized by XRD, BET, TEM andUV/vis analysis. The Ag particle size was possible to be controlled by tuning the FSPparameters. For the SiO_2 coated nanoparticles, larger Ag core sizes were obtained for higherBRDs. All the produced nanoparticles exhibited the characteristic plasmon resonance frequencyof Ag nanoparticles.
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