Preparation and thermally promoted ripening of water-soluble gold nanoparticles stabilized by weakly physisorbed ligands |
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Authors: | Griffin Fionn Fitzmaurice Donald |
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Institution: | Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland. fionn.griffin@esb.ie |
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Abstract: | Here, we report on a facile method for the preparation of an aqueous dispersion of 3.6 nm gold nanoparticles electrostatically stabilized by a weakly physisorbed ligand, namely, 4-(dimethylamino)pyridine (DMAP). The nature and extent of the interaction of this ligand with the surface of a gold nanoparticle has been examined. We also report on the thermally promoted ripening of these nanoparticles under mild conditions to yield a dispersion of 11.3 nm gold nanoparticles. The role of the weakly physisorbed DMAP ligand in facilitating thermally promoted ripening under mild conditions has also been examined. |
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