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SEM and Raman Spectroscopy of Multiwalled Carbon Nanotubes Grown by Novel Technique of Ash Supported Catalysts

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Multiwalled carbon nanotubes (MWCNTs) were grown on a novel ASC catalyst and on catalyst deposited by SCC method on silicon wafer, by thermal CVD of acetylene. Fe and Ni were used as catalyst for ASC. Samples were analyzed by SEM and Raman spectroscopy. SEM analysis shows that CNTs grown on ASC have narrower diameter distribution (64 ± 6 nm) compared to CNTs grown on SCC (67 ± 10.5 nm). However, SEM and Raman spectroscopy studies show CNTs grown on SCC are of better quality. The same samples were studied after standard purification procedure of oxidation after annealing at high temperatures. SEM and Raman spectroscopy show that overall quality of ensemble of CNTs has improved. After annealing, diameter decreases for larger diameter ∼200 nm nanotubes while it increases for CNTs of smaller diameter ∼70 nm. To explain the increase in diameter of ∼70 nm CNT's, a phenomenological model has been proposed. The results of Raman spectroscopy and SEM corroborate the proposed model.


Document Type: Research Article


Publication date: 2007-06-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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