2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Magnetite-gold nanoparticles: Sonochemical priming of gold and growth to a core-shell system

P. Quaresma, R. Franco, P. Carvalho, J.P. Araujo, P. Baptista, E. Pereira
Faculdade de Ciências, Universidade do Porto, PT

gold nanoparticles, magnetic nanoparticles, magnetic separation

Magnetic nanoparticles for selective capture of biomolecules in complex mixtures is gaining momentum in bionanotechnology by providing significant advantages over traditional methods of separation. A magnetite-gold core-shell structure would grant researchers with an integrated detection and “gene fishing” platform by means of the detection properties of gold nanoparticle systems combined with a magnetic component. Magnetic nanoparticles of Fe3O4 were produced using a acetylacetonate metal precursor resulting in enhanced control over size and monodispersity, as confirmed by transmission electron microscopy (TEM). An ultrasound mediated procedure was employed for in-situ formation of gold nuclei on the surface of magnetite nanoparticles. The growth of the gold nuclei on the magnetite to a gold shell layer was achieved by an iterative addition of gold precursor and reducing agent. The growth of the gold layer was followed by TEM, UV-Vis and EDS. Magnetic measurements were performed by SQUID and show the superparamagnetic character of the formed particles. A novel photochemical system for the gradual reduction of the gold precursor on the pre-existing nuclei was also used and preliminary results are discussed.

Nanotech 2008 Conference Program Abstract