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Título : Evolution of the microstructure, chemical composition and magnetic behaviour during the synthesis of alkanethiol-capped gold nanoparticles
Autor : Guerrero, Estefanía, Rojas, T. Cristina, Fernández-Camacho, A., Multigner, M., Crespo, Patricia, Muñoz-Márquez, Miguel Ángel, García, M. A., Hernando, Antonio
Palabras clave : Gold nanoparticles
Magnetic behaviour
Fecha de publicación : 21-Dec-2006
Editor: Elsevier
Citación : Acta Materialia, 55 (5) : 1723-1730 (2007)
Resumen: In the present paper, we show an exhaustive microstructural characterization of thiol-capped gold nanoparticles (NPs) with two different average particle sizes. These samples are compared with the polymer-like Au(I) phase formed as a precursor during the synthesis of the thiol-capped gold NPs. The set of analysed samples shows different microstructures at the nanoscale with different proportions of Au atoms bonded either to S or to Au atoms. It has been experimentally shown that the presence of a ferromagnetic-like behaviour is associated to the formation of NPs with simultaneous presence of Au–Au and Au–S bonds. In order to explain such magnetic behaviour a possible model is proposed based on the spin–orbit coupling so that localized charges and/or spins (Au–S bonds) can trap conduction electrons (Au–Au bonds) in orbits.
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ISSN: 1359-6454 (Print)
DOI: 10.1016/j.actamat.2006.10.033
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