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The Effect of Pressure on the Dimensions of Carbon Nanotubes Obtained by the Chemical Vapour Deposition

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Carbon nanotubes were synthesized by decomposing ferrocene at 800 °C while investigating the effect of the pressure and flow rate of argon gas on their yield. Thermal decomposition of ferrocene provides both catalytic particles and a carbon source for carbon nanotubes growth. Results showed that a pressure up to 1 bar in conjunction with a temperature higher than 800 °C was favourable for obtaining nanotubes up to ∼40 μm long with diameter ∼20–25 nm. The X ray diffraction pattern shows that they are well crystallized, having hexagonal graphitic nature and showed no evidence of amorphous carbon. Raman spectroscopy was used for the determination of the type of carbon nanotubes, as well as the presence of the defects in the collected soot. Radial breathing mode in Raman spectroscopy clearly indicates the presence of single wall carbon nanotubes in the collected soot. The surface morphology and structure of these carbon nanotubes was revealed by scanning and transmission electron microscopy.
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Keywords: CVD; RAMAN SPECTROSCOPY; SEM; TEM; XRD

Document Type: Research Article

Publication date: February 1, 2011

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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