Publication: Evolution of the microstructure, chemical composition and magnetic behaviour during the synthesis of alkanethiol-capped gold nanoparticles
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Publication Date
2007-03
Authors
Guerrero, E.
Rojas, T. C
Multigner, M.
Crespo del Arco, Patricia
Muñoz Márquez, M. A.
García, M. A.
Fernández, A.
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Pergamon-Elsevier Science LTD
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Abstract
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 An 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. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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© 2006 Acta Materialia Inc. Published by Elsevier Ltd.
XAS facilities at BM29 in ESRF and the technical support rom G.L. Ciatto are acknowledged. Financial support from the Spanish MEC (NAN2004-09125-C07) and ‘‘Junta de Andalucía’’ is also acknowledged. E. Guerrero thanks the Spanish MEC for financial support.