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Synthesis of silver-gold alloy nanoparticles by a phase-transfer system

Published online by Cambridge University Press:  01 January 2006

R.J. Chimentão ,
I. Cota ,
A. Dafinov ,
F. Medina ,
J.E. Sueiras ,
J.L. Gómez de la Fuente ,
J.L.G. Fierro ,
Y. Cesteros  and
P. Salagre
R.J. Chimentão
Affiliation:
Departament d’Enginyeria Química, Universitat Rovira i Virgili, 43007 Tarragona, Spain
I. Cota
Affiliation:
Departament d’Enginyeria Química, Universitat Rovira i Virgili, 43007 Tarragona, Spain
A. Dafinov
Affiliation:
Departament d’Enginyeria Química, Universitat Rovira i Virgili, 43007 Tarragona, Spain
F. Medina*
Affiliation:
Departament d’Enginyeria Química, Universitat Rovira i Virgili, 43007 Tarragona, Spain
J.E. Sueiras
Affiliation:
Departament d’Enginyeria Química, Universitat Rovira i Virgili, 43007 Tarragona, Spain
J.L. Gómez de la Fuente
Affiliation:
Instituto de Catálisis y Petroleoquímica, CSIC, Cantoblanco, 28049 Madrid, Spain
J.L.G. Fierro
Affiliation:
Instituto de Catálisis y Petroleoquímica, CSIC, Cantoblanco, 28049 Madrid, Spain
Y. Cesteros
Affiliation:
Departament de Química Inorgànica, Universitat Rovira i Virgili, 43005 Tarragona, Spain
P. Salagre
Affiliation:
Departament de Química Inorgànica, Universitat Rovira i Virgili, 43005 Tarragona, Spain
*
a)Address all correspondence to this author. e-mail: fmedina@etse.urv.es
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Abstract

We have studied the preparation of silver-gold alloy nanoparticles based on the phase transfer of metal precursors from aqueous phase to organic solution by a fatty amine at room temperature. Silver-gold nanoparticles were synthesized with different molar ratios (2:1, 1:1, 1:2). Ultraviolet-visible absorption spectra suggested the formation of alloy phases. The elemental Ag:Au ratios in the bimetallic nanoparticles determined by energy dispersive x-ray analysis (EDX) were consistent with the Ag:Au molar ratios used in the feeding solution. Transmission electron microscopy (TEM) revealed the formation of a uniform size distribution of Ag:Au nanoparticles (around 5 nm). X-ray photoelectron spectroscopy (XPS) showed that the composition in the outer part of the Ag:Au nanoparticles was similar to that obtained by EDX analysis, which indicates the formation of homogeneous silver-gold nanoparticles. Silver-gold alloy nanoparticles on a gram scale can be obtained with this method.

Keywords

NanoparticleTransmission electron microscopy (TEM)X-ray photoelectron spectroscopy (XPS)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 105 - 111
Copyright
Copyright © Materials Research Society 2006

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