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Journal of Nanomaterials
Volume 2015, Article ID 587416, 14 pages
http://dx.doi.org/10.1155/2015/587416
Research Article

Magnetic and Electrical Properties of Nitrogen-Doped Multiwall Carbon Nanotubes Fabricated by a Modified Chemical Vapor Deposition Method

1Advanced Materials Division, IPICYT, Camino a la Presa, San Jose 2055, 78216 San Luis Potosí, SLP, Mexico
2Department of Chemistry, Federal University of Pernambuco, Cidade Universitária, 50670-901 Recife, PE, Brazil
3CONACYT-Lectures, Technological Institute of Celaya, Avenida Tecnologico Esquina con Garcia Cubas S/N, 38010 Celaya, GTO, Mexico
4Institute for Carbon Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano City 380-8553, Japan
5Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA 16802-6300, USA
6Department of Chemistry, Department of Materials Science and Engineering & Materials Research Institute, The Pennsylvania State University, University Park, PA 16802-6300, USA

Received 27 September 2014; Revised 13 January 2015; Accepted 19 January 2015

Academic Editor: Myoung-Woon Moon

Copyright © 2015 María Luisa García-Betancourt 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

Chemical vapor deposition (CVD) is a preferential method to fabricate carbon nanotubes (CNTs). Several changes have been proposed to obtain improved CNTs. In this work we have fabricated nitrogen-doped multiwall carbon nanotubes (N-MWCNTs) by means of a CVD which has been slightly modified. Such modification consists in changing the content of the by-product trap. Instead of acetone, we have half-filled the trap with an aqueous solution of NaCl (0–26.82 wt.%). Scanning electron microscope (SEM) characterization showed morphological changes depending upon concentration of NaCl included in the trap. Using high resolution transmission electron microscopy several shape changes on the catalyst nanoparticles were also observed. According to Raman spectroscopy results N-MWCNTs fabricated using pure distillate water exhibit better crystallinity. Resistivity measurements performed on different samples by physical properties measurement Evercool system (PPMS) showed metallic to semiconducting temperature dependent transitions when high content of NaCl is used. Results of magnetic properties show a ferromagnetic response to static magnetic fields and the coercive fields were very similar for all the studied cases. However, saturation magnetization is decreased if aqueous solution of NaCl is used in the trap.