Anisotropies in Carbon Nanotube Synthesis by the Hydrogen Arc Plasma Jet Method
| Autor: | V. Cruz‐Alvarez, J. Ortiz-López, C. Mejía‐García, J. Chávez‐Carvayar, V. M. Sánchez‐Martínez, J. S. Arellano‐Peraza |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Hydrogen Organic Chemistry Analytical chemistry chemistry.chemical_element Carbon nanotube Atomic and Molecular Physics and Optics Cathode law.invention Anode Condensed Matter::Materials Science symbols.namesake chemistry Physics::Plasma Physics law Transmission electron microscopy symbols General Materials Science Graphite Physical and Theoretical Chemistry Raman spectroscopy Raman scattering |
| Zdroj: | Fullerenes, Nanotubes and Carbon Nanostructures. 13:299-311 |
| ISSN: | 1536-4046 1536-383X |
| DOI: | 10.1080/15363830500237143 |
| Popis: | Single‐wall carbon nanotubes were prepared under hydrogen gas atmosphere with a DC arc discharge maintained between the tip of a sharpened graphite cathode and an anode formed by a catalytic mixture of graphite, FeS, Ni, Fe and Co compressed powders. The cathode is placed with an inclination with respect to the anode, so that the plasma jet of the discharge is deviated towards the empty space of the growth chamber. Samples were classified and analyzed according to their type and growth positions relative to the direction of the plasma jet flow. Characterization of the samples was performed with mass spectrometry, Raman spectroscopy and transmission electron microscopy. A subtle variation is found in the properties of the nanotubes obtained in different locations due to the directionality of the plasma jet flow. Observed differences in sample properties may be qualitatively understood in terms of accepted mechanisms of SWNT growth. |
| Databáze: | OpenAIRE |
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