Multiwalled carbon nanotubes with high crystallinity and purity were synthesized with acetylene as the carbon source using radio frequency catalytic chemical vapor deposition method (RF-CCVD) and a bimetallic Fe-Co catalyst supported on CaO at 720°C. The sample obtained was tested using Raman spectroscopy, high resolution transition electron microscopy (HRTEM) and thermogravimetric analysis (TGA). The Raman spectra revealed G to D band and 2D to G band intensity ratios of 0.90 and 0.54 respectively. A purity of 90% was obtained from the TGA studies. HRTEM studies further showed that the nanotubes had an average diameter of 14.7 ± 4.76nm.
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S. Ramakrishnan, Jelmy, E. J., Baladandapani, A., Rangarajan, M., and Kothurkar, N. K., “Synthesis of multiwalled carbon nanotubes using RF-CCVD and a bimetallic catalyst”, SOLID STATE PHYSICS: PROCEEDINGS OF THE 56TH DAE SOLID STATE PHYSICS SYMPOSIUM 2011, vol. 1447. AIP Publishing, pp. 275-276, 2012.