Carbosilane dendrons as stabilizing agents for the formation of gold nanoparticles |
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Authors: | Ferran Gonzàlez de Rivera Lara-Isabel Rodríguez Oriol Rossell Miquel Seco Núria J Divins Ignasi Casanova Jordi Llorca |
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Institution: | 1. Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain;2. Institut de Tècniques Energètiques i Centre de Recerca en Nanoenginyeria, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain |
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Abstract: | The synthesis and characterization of two new carbosilane dendrons functionalized in the focal point with a single thiol group is described. These molecules were used as stabilizing agents for the formation of gold nanoparticles. These materials were obtained by the reduction of hydrogen tetrachloroaurate phase-transferred into toluene in the presence of the carbosilane dendrons. The gold nanoparticle-cored dendrons (NCDs) were characterized by TEM, XPS, AFM, IR, UV, and NMR techniques. Average particle diameter ranged from 2.5 to 2.6 nm with narrow size distribution and remarkable stability; in particular, the elimination of the protecting shells to give naked gold, after NCDs deposition on a support, is more difficult using carbosilane dendrons than in the case of conventional dodecanethiol-protected gold nanoparticles. |
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