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

Partnering Events:

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

Keywords:
gold nanoparticles, magnetic nanoparticles, magnetic separation

Abstract:
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