Platinum nanoparticles from hydrosilylation reaction: Carbosilane dendrimer as capping agent

In this paper, platinum nanoparticles were prepared in the hydrosilylation reaction, in which carbosilane dendrimer was used as capping agent and stabilizer. UV-vis spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscopy were employed to characterize the reaction system and the obtained Pt nanoparticles. The high SiH/Pt ratios could accelerate the formation of Pt nanoparticles in hydrosilylation reaction. When the hydrosilane was excess in the reaction, the formed Pt nanoparticles were first capped by hydrosilane molecules via Pt-Si bonds and then stabilized by dendrimers. While under the condition of excess olefin, the Pt nanoparticles were directly capped and stabilized by dendrimers via Pt-C bonds. The formed Pt nanoparticles had a good dispersibility with different size. (C) 2010 Elsevier B.V. All rights reserved.