Synthesis and analysis of multi-walled carbon nanotubes/oxides hybrid materials for polymer composite applications |
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| Authors: | E PiperopoulosS Santangelo M LanzaG Faggio G MessinaS Galvagno A PistoneC Milone |
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| Affiliation: | a Dept. of Industrial Chemistry and Materials Engineering, Univ. of Messina, I-98166 Messina, Italyb Dept. of Mechanics and Materials, Univ. “Mediterranea” of Reggio Calabria, I-89122 Reggio Calabria, Italyc CNR, Inst. for Chemical Physical Processes, Messina Section, I-98158 Messina, Italy |
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| Abstract: | Nanotubes-based nanocomposites to be used as polymer reinforcing/flame-retardant additives are synthesized by decomposition of isobutane at 600 °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 °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. |
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| Keywords: | Carbon nanotubes Chemical vapor deposition CNT-based hybrids Alkaline earth metal oxides |
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