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Journal of Nanotechnology - Volume 2016 2016, Article ID 6571643, 6 pages -

Research Article

Department of Electrical Engineering, Section of Solid State Electronics, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Avenida IPN No. 2508, 07360 Ciudad de México, Mexico

PhD Program in Nanoscience and Nanotechnology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Avenida IPN No. 2508, 07360 Ciudad de México, Mexico

Departamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Avenida IPN No. 2508, 07360 Ciudad de México, Mexico

Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León, Avenida Universidad s-n, Ciudad Universitaria, 66455 San Nicolás de los Garza, NL, Mexico

Received 16 February 2016; Accepted 11 April 2016

Academic Editor: Chuan Jian Zhong

Copyright © 2016 A. M. Espinoza-Rivas 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

Graphite-coated iron nanoparticles were prepared from magnetite nanoparticles by chemical vapour deposition CVD under methane and hydrogen atmosphere. After being purified from carbon excess, graphite-coated iron nanoparticles were tested for morphological and magnetic properties. It was found that, during the thermal process, magnetite nanoparticles 6 nm in size coalesce and transform into graphite-coated iron 200 nm in size, as revealed by scanning electron microscopy SEM. Raman characterization assessed that high-quality graphite coats the iron core. Magnetic measurements revealed the phase change magnetite to iron as an increase in the saturation magnetization from 50 to 165 emu-g after the CVD process.





Autor: A. M. Espinoza-Rivas, M. A. Pérez-Guzmán, R. Ortega-Amaya, J. Santoyo-Salazar, C. D. Gutiérrez-Lazos, and M. Ortega-López

Fuente: https://www.hindawi.com/



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