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Research Letters in Materials Science
Volume 2008, Article ID 850975, 5 pages
http://dx.doi.org/10.1155/2008/850975
Research Letter

Production of Carbon Nanofibers Using a CVD Method with Lithium Fluoride as a Supported Cobalt Catalyst

Materials Engineering Department, Islamic Azad University, Shahrood Branch, P.O. Box 36155-163, Shahrood, Iran

Received 26 September 2007; Accepted 26 December 2007

Academic Editor: Maria Antonietta Loi

Copyright © 2008 S. A. Manafi and S. H. Badiee. 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

Carbon nanofibers (CNFs) have been synthesized in high yield ( > 7 0 %) by catalytic chemical vapor deposition (CCVD) on Co/LiF catalyst using acetylene as carbon source. A novel catalyst support (LiF) is reported for the first time as an alternative for large-scale production of carbon nanofibers while purification process of nanofibers is easier. In our experiment, the sealed furnace was heated at 7 0 0 C for 0.5 hour (the heating rate was 1 0 C / m i n ) and then cooled to room temperature in the furnace naturally. Catalytic chemical vapor deposition is of interest for fundamental understanding and improvement of commercial synthesis of carbon nanofibers (CNFs). The obtained sample was sequentially washed with ethanol, dilutes acid, and distilled water to remove residual impurities, amorphous carbon materials, and remaining of catalyst, and then dried at 1 1 0 C for 24 hours. The combined physical characterization through several techniques, such as high-resolution transmission electron microscope (TEM), scanning electron microscope (SEM), thermogarvimetric analysis (TGA), and zeta-sizer and Raman spectroscopy, allows determining the geometric characteristic and the microstructure of individual carbon nanofibers. Catalytic chemical vapor deposition is of interest for fundamental understanding and improvement of commercial synthesis of carbon nanofibers (CNFs). As a matter of fact, the method of CCVD guarantees the production of CNFs for different applications.