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Journal of Nanomaterials
Volume 2008, Article ID 515890, 7 pages
http://dx.doi.org/10.1155/2008/515890
Research Article

Direct Deposition of Bamboo-Like Carbon Nanotubes on Copper Substrates by Sulfur-Assisted HFCVD

1Institute for Functional Nanomaterials, University of Puerto Rico, P.O. Box 23343, San Juan, PR 00931, USA
2Department of Chemistry, University of Puerto Rico, P.O. Box 23343, San Juan, PR 00931, USA
3Department of Physics, University of Puerto Rico, P.O. Box 23343, San Juan, PR 00931, USA

Received 28 May 2008; Accepted 21 October 2008

Academic Editor: Alan K. T. Lau

Copyright © 2008 Sri Lakshmi Katar 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

Films of bamboo-like carbon nanotubes (BCNTs) were grown directly on copper substrates by sulfur-assisted hot filament chemical vapor deposition (HFCVD). The effects of substrate temperature and growth time over the BCNT structure were investigated. The films were characterized by scanning electron microscopy (SEM), Raman spectroscopy (RS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and electron field emission (EFE) studies. SEM and Raman characterization indicate a transition from the growth of microcrystalline diamond to the growth of a dense entangled network of carbon nanotubes or fibers as the substrate temperature is increased from 400 to that is accounted for by the base growth model. TEM images show that the nanotubes have regular arrays of nanocavities. These BCNTs show good electron field emission properties as other carbon films.