Journal
DIAMOND AND RELATED MATERIALS
Volume 20, Issue 4, Pages 532-537Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2011.02.005
Keywords
Carbon nanotubes; Chemical vapor deposition; CNT-based hybrids; Alkaline earth metal oxides
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Nanotubes-based nanocomposites to be used as polymer reinforcing/flame-retardant additives are synthesized by decomposition of isobutane at 600 degrees C. Catalytic chemical vapor deposition (CCVD) is carried out over 17 wt%Fe-catalysts supported on various oxides (Al2O3, MgO, CaO, SrO or BaO) reduced at 600 degrees C. Catalysts utilized and carbonaceous deposits obtained are systematically characterized by the use of several analysis techniques, in order to investigate the influence of catalyst specifics on reaction yield, selectivity and characteristics (crystallinity and purity) of the grown nanotubes. The results show that the support greatly influences the catalyst performance. The lack of metallic iron renders Fe/SrO- and Fe/BaO-catalysts inactive. Fe/Al2O3 catalysts exhibit the highest catalytic activity, but give rise to scarce selectivity and large metallic impurity contents. Contrarily, using Fe/MgO and Fe/CaO catalysts leads to lower yields, but allows reducing impurities and remarkably improving selectivity and nanotube crystallinity. (C) 2011 Elsevier B.V. All rights reserved.
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