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A method for the controlled synthesis of alkanethiol‐derivatized gold clusters to be used as fillers for polymeric nanocomposites has been developed. Gold clusters embedded in poly( N ‐vinyl pyrrolidone) (PVP) were obtained by reduction of AuCl 4 − with ethylene glycol in the presence of PVP as a stabilizer. The gold/PVP system was separated from the reactive mixture by flocculation with acetone, and this material was treated with a dodecanethiol/ethanol solution to produce thiol‐derivatized gold clusters. Then, the clusters were dispersed in polystyrene/chloroform solutions and highly transparent purple‐colored nanocomposite films were obtained by solution casting. This preparative scheme allows one to obtain high‐purity nanocomposites, with complete control over the filler percentage and size.
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Carotenuto et al. (2004) studied this question.
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