Platinum colloidal solutions have showed potential applications in various fields such as environment, biomedicine, catalysis, electronics, etc. According to a charateristic of poly(vinyl pyrolidone) (PVP) solution in which poly(vinyl pyrrolidone) chains are crosslinked and insoluble at higher temperatures with alkaline medium, we introduce a novel method to prepare nanoclusters like poly(vinyl pyrolidone)based nanogels containing ultrafine platinum nanoparticles when hexachloroplatinic acid

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... reduced with mixture of poly(vinyl pyrolidone) and trisodium citrate at higher temperatures in alkaline medium. Formations of platinum nanoparticles and the nanoclusters were investigated under different pH and molecular weight of poly(vinyl pyrolidone). The colloidal solutions were characterized by UV-visible, XRD and TEM. Our results indicated that ultrafine platinum nanoparticles arround 2 nm encapsulated in nanoclusters when the preparation was conducted in alkaline media and platinum nanoparticles were produced at smaller size when lower molecular weight of poly(vinyl pyrrolidone) was used.