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Synthesis and chracterization of Ag2S fluorescent nanoparticles in hard and soft medium

M. Leon, M. Morales, R. Irizary and M.E. Castro
The University of Puerto Rico at Mayaguez, US

Keywords:
Ag2S, fluorescent nanoparticles, inverse micelles, silica matrices

Abstract:
Real time monitoring nanoparticle growth is central to the understanding of the mechansisms of nanoparticle synthesis. We have employed a stop flow reactor to study the formation of Ag2S nanoparticles. Ag2S nanoparticles absorb UV light around 230 nm. Conductivity measurements have been performed to obtain information on the kinetics of Ag2S formation in solution and in inverse micelles. Ag2S nanoparticles emit visible light upon laser excitation. The fluoresence of Ag2S inmovilized in silica is strongly quenched upon exposure of dinitro toluene, a common by product of TNT synthesis. The possible field applications of Ag2S nanoparticles in sensing nitroaromatics will be described.

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