1. CCVD synthesis of carbon nanotubes with W/Co–MgO catalysts
- Author
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Alain Peigney, Emmanuel Flahaut, Lucien Datas, Loic Frin, Christophe Laurent, Perine Landois, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and Centre National de la Recherche Scientifique - CNRS (FRANCE)
- Subjects
Materials science ,Magnesium ,Matériaux ,chemistry.chemical_element ,General Chemistry ,Carbon nanotube ,Tungsten ,equipment and supplies ,Methane ,law.invention ,Catalysis ,chemistry.chemical_compound ,Transition metal ,chemistry ,Chemical engineering ,Transmission electron microscopy ,law ,General Materials Science ,Composite material ,Materials ,Carbon - Abstract
Carbon nanotubes (CNT) were synthesized from a H2–CH4 mixture with W/Co–MgO catalyst by a catalytic chemical vapour deposition (CCVD) method. Different W/Co ratios were investigated. From transmission electron microscopy observations, we observed that both the number of walls and the diameter of CNT increased with the proportion of tungsten. A promoter effect was observed as long as the proportion of tungsten was kept low and CNT with a number of walls ranging from 2 to 5 were obtained. With a higher proportion of tungsten, multi-walled carbon nanotubes (MWNT) up to 10 walls were synthesised, together with additional undesirable carbon nanofibres.
- Published
- 2009
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