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RevistaJournal of Nanoparticle Research
Año2010
Volumen12
Páginas1307-1318
Internacional

Permanent magnetism in phosphine and chlorine capped gold: from clusters to nanoparticles

Autores:M.A. Muñoz-Márquez , E. Guerrero , A. Fernández , P. Crespo , A. Hernando , Raquel Lucena García, J. C. Conesa
Grupos de investigación:Catalizadores Nanoestructurados para Energía
Magnetometry results have shown that gold NPs (*2 nm in size) protected with phosphine and chlorine ligands exhibit permanent magnetism. When the NPs size decreases down to the subnanometric size range, e.g. undecagold atom clusters, the permanent magnetism disappears. The near edge structure of the X-ray absorption spectroscopy data points out that charge transfer between gold and the capping system occurs in both cases. These results strongly suggest that nearly metallic Au bonds are also required for the induction of a magnetic response. Electron paramagnetic resonance observations indicate that the contribution to magnetism from eventual iron impurities can be disregarded.
Palabras clave:EPR, Au nanoparticles, ferromagnetic
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