Precise control of the Pt nanoparticle size by seeded growth using EO13PO30EO13 triblock copolymers as protective agents

Here, we report an efficient way to produce homogeneous Pt nanoparticles within a well-defined size range (3.5-6.6 nm) as a result of the seeded growth procedure using Pluronic L64 polymer capping agent. First, small seeds (3.5 nm) were prepared by the reduction of H2PtCl6- 6H(2)O in water with NaBH4 in the presence of the capping poly(ethylene oxide)(13)-poly(propylene oxide)(30)-poly(ethylene oxide)(13) triblock copolymer at room temperature. Additional anionic Pt salt was then introduced under flowing H-2 to obtain larger nanoparticles.