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Evolution of the microstructure, chemical composition and magnetic behaviour during the synthesis of alkanethiol-capped gold nanoparticles

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Guerrero, E. and Rojas, T. C and Multigner, M. and Crespo del Arco, Patricia and Muñoz Márquez, M. A. and García, M. A. and Hernando Grande, Antonio and Fernández, A. (2007) Evolution of the microstructure, chemical composition and magnetic behaviour during the synthesis of alkanethiol-capped gold nanoparticles. Acta materialia, 55 (5). pp. 1723-1730. ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/j.actamat.2006.10.033


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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.

Uncontrolled Keywords:Cluster molecules; Gold nanoparticles; Microstructure, Magnetic behaviour
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:41788
Deposited On:14 Mar 2017 11:52
Last Modified:01 Mar 2019 00:01

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