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Synthesis and Characterization of Alloys and Bimetallic Nanoparticles of CuNi Prepared by Sol-Gel Method

Published online by Cambridge University Press:  20 December 2012

E.L. de León-Quiroz ,
D. Vázquez Obregón ,
A. Ponce Pedraza ,
E. Larios-Rodríguez ,
M. José-Yacaman  and
L.A. García-Cerda
E.L. de León-Quiroz*
Affiliation:
Instituto Tecnológico de Saltillo, Blvd. V. Carranza No. 2400, Saltillo, Coah., México
D. Vázquez Obregón
Affiliation:
Instituto Tecnológico de Saltillo, Blvd. V. Carranza No. 2400, Saltillo, Coah., México
A. Ponce Pedraza
Affiliation:
University of Texas at San Antonio. One UTSA Circle. San Antonio, TX. 78249
E. Larios-Rodríguez
Affiliation:
University of Texas at San Antonio. One UTSA Circle. San Antonio, TX. 78249
M. José-Yacaman
Affiliation:
University of Texas at San Antonio. One UTSA Circle. San Antonio, TX. 78249
L.A. García-Cerda*
Affiliation:
Centro de Investigación en Química Aplicada), Blvd. Enrique Reyna No. 140, Saltillo, Coah., C.P. 25294, México
*
*Corresponding authors: [email protected], [email protected]
*Corresponding authors: [email protected], [email protected]
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Abstract

Recently, bimetallic nanostructures and nanoalloys have received special interest due to their promising chemical and physical properties. Specifically, Cu-Ni nanoparticles have been investigated for biomedical and catalytic applications. This work reports the synthesis of alloys and bimetallic nanoparticles of CuxNi100-x (x = 20, 40, 50, 60 and 80) by sol-gel method, and their morphological, structural and magnetic characterization. A precursor material was prepared using a standard Pechini method and then CuNi nanoparticles were obtained by calcination treatments of the precursor in H2/N2atmosphere at 600 and 700°C for 15 minutes. The resulting nanoparticles were characterized by X-ray diffraction (XRD), which reveals that this method led to the formation of CuNi substitutional nanoalloys and bimetallic nanoparticles with good cristallinity related with the calcination temperatures and Cu:Ni weight ratios. Transmission electron microscopy (TEM) shows nearly monodisperse and uniform spherical nanoparticles with sizes between 40 and 70 nm. The magnetic properties were studied using SQUID magnetometry, according with these results, the CuNi nanoparticles showed a ferromagnetic behavior, the magnetization value increases as a function of the weight percentage of Ni.

Keywords

nanostructurealloysol-gel
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1479: Symposium S – Nanostructured Materials and Nanotechnology—2012 , 2012 , pp. 9 - 14
Copyright
Copyright © Materials Research Society 2012

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