Dendrimer-cyclodextrin assemblies as stabilizers for gold and platinum nanoparticles


Michels, Jasper J. and Huskens, Jurriaan and Reinhoudt, David N. (2002) Dendrimer-cyclodextrin assemblies as stabilizers for gold and platinum nanoparticles. Journal of the Chemical Society. Perkin transactions II, 2002 (1). pp. 102-105. ISSN 0300-9580

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Abstract:Aqueous assemblies of adamantyl-derivatized poly(propylene imine) (PPI) dendrimers and B-cyclodextrin (B-CD) have been used as nanoreactors in the preparation of gold and platinum nanoparticles in water. These particles have been formed by the reduction of aurate or platinate anions in the presence of the generation 4 (4·(B-CD)32) and 5 ( 5·(B-CD)40) assemblies. Lower generation assemblies did not provide stable nanoparticles. A kinetic model is proposed in which the particles form inside the dendrimer assemblies owing to preferred nucleation as a result of the electrostatic attraction between the polycationic core and the metallate anions. The persistent shape of the adamantyl-derivatized dendrimers and the dense shell of adamantyl-B-CD complexes provide a kinetic barrier for nanoparticle escape thus prolonging their lifetime. Exchange of the dendrimers for a cationic disulfide provided stable, water-soluble metal nanoparticles without change of their size distribution.
Item Type:Article
Copyright:© Royal Society of Chemistry 2002
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Metis ID: 203080