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Formation of Beaded Vapor Grown Carbon Nanofibers

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Carbon nanofibers having interesting smooth, spherical beads are synthesized using a catalyst assisted vapor phase process under various methane/hydrogen mixtures. Fe1–x S x powders were used as the catalyst. The synthesis temperatures were 1100 °C and 1200 °C, which are lower than the ones used previously for the formation of beaded carbon nanofibers or nanotubes. Unlike the high temperature (≥1300 °C) grown beads that may exhibit a rough surface, all the beads obtained at both 1100 and 1200 °C with various methane concentrations have a smooth surface. The diameter and the linear density (no. of beads per unit fiber length) of the beads do not seem to correlate to the growth temperature and the methane concentration. The linear density is also independent of the growth time. However, the beads grow with time. Although the grown mechanism is not clear at the present time, it seems that a three-dimensional nucleation model plays a role.
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Document Type: Research Article

Publication date: June 1, 2011

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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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