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Journal of Nanomaterials
Volume 2011 (2011), Article ID 162495, 6 pages
http://dx.doi.org/10.1155/2011/162495
Research Article

Preparation of hcp and fcc Ni and Ni/NiO Nanoparticles Using a Citric Acid Assisted Pechini-Type Method

1Departamento de Materiales Avanzados, Centro de Investigación en Química Aplicada, Boulevard. Enrique Reyna Hermosillo #140, CP 25253 Saltillo, COAH, Mexico
2Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Boulevard. V. Carranza e Ing. José Cárdenas V. s/n, 25280 Saltillo, COAH, Mexico
3Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA

Received 13 April 2011; Revised 29 September 2011; Accepted 29 September 2011

Academic Editor: Christian Brosseau

Copyright © 2011 L. A. García-Cerda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The preparation and characterization of hcp and fcc Ni and Ni/NiO nanoparticles is reported. Ni and Ni/NiO nanoparticles were obtained starting from a precursor material prepared using a citric assisted Pechini-type method and, then, followed by a calcination of the precursor in air at either 400 or 600°C for different times. The precursor was analyzed using thermogravimetric and differential thermal methods (TGA-DTA), and the resulting nanoparticles were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and vibrational sample magnetometry. Nanoparticles showed a phase transformation for Ni from hcp to fcc and/or to fcc NiO structure as the calcination time increased. The influence of the phase transition and the formation of NiO on the magnetic properties of the samples are discussed.