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PbS doped-silica gels showing a visible absorption onset were prepared by the sol-gel method. PbS nanoparticles with strong quantum-confinement effect were obtained from sodium sulfide and lead nitrate by the reverse micelle method. Chemical parameters such as the water/surfactant and the [Pb2+]/[S2-] ratios play a very important role in the PbS particle size and in their absorption threshold. The...