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Silica-coated Silver Nanoparticles

Published online by Cambridge University Press:  31 January 2011

Georgios A Sotiriou and
Sotiris E. Pratsinis
Georgios A Sotiriou
Affiliation:
geosotiriou@ptl.mavt.ethz.ch
Sotiris E. Pratsinis
Affiliation:
pratsinis@ptl.mavt.ethz.ch, Particle Technology Laboratory, Department of mechanical and process engineering, Zurich, Switzerland
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Abstract

Silver (Ag) nanoparticles dispersed in an amorphous silica (SiO2) matrix or coated by a SiO2 layer were synthesized by flame spray pyrolysis (FSP). The coated nanoparticles were produced by using a modified enclosed FSP setup, in which the SiO2 precursor was injected through a ring above the FSP nozzle at various burner-ring-distances (BRDs), after the core Ag nanoparticles had been formed. The produced nanoparticles were characterized by XRD, BET, TEM and UV/vis analysis. The Ag particle size was possible to be controlled by tuning the FSP parameters. For the SiO2 coated nanoparticles, larger Ag core sizes were obtained for higher BRDs. All the produced nanoparticles exhibited the characteristic plasmon resonance frequency of Ag nanoparticles.

Keywords

Agcoatingcomposite

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