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Formation and Microstructural Characterization of Coaxial Carbon Cylinders Consisting of Aligned Carbon Nanotube Stacks

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Abstract:

The macroscopic coaxial carbon cylinders (dia. ∼0.5 cm with varying lengths ∼2–5 cm) consisting of aligned carbon nanotube (CNT) stacks have been prepared by spray pyrolysis of benzene-ferrocene solution in argon atmosphere at ∼850 °C–900 °C temperature. The coaxial carbon cylinders of CNT stacks have been formed directly inside the quartz tube. We attempted to prepare superimposed multi carbon cylinder configurations, each consisting of ordered and aligned CNTs stacked over each other. For this, we have terminated the spray of precursor after run of about 25 minutes, for a short interval (∼5 min), and then the solution was sprayed again over the already deposited hot CNT stack. Gross structural characterization of CNTs was done through X-ray diffraction technique (XRD). Microstructural characterizations of as prepared coaxial carbon cylinders with CNT stacks were done by scanning electron microscopic (SEM) techniques. SEM studies show that the CNTs are well aligned along the periphery of the cross section of coaxial carbon cylinder, each consisting of CNTs of the type described in the above. Comparisons have been made between the present macroscopic coaxial carbon cylinders with CNT stacks studied earlier by several other workers. Plausible explanation for the synthesis of CNT stacks will be put forward.

Keywords: ALIGNED CNTS; CNT STACKS; COAXIAL CARBON CYLINDERS; SCANNING ELECTRON MICROSCOPY (SEM); SPRAY PYROLYSIS; TRANSMISSION ELECTRON MICROSCOPY (TEM); X-RAY DIFFRACTION TECHNIQUE (XRD)

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2007.722

Publication date: June 1, 2007

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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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