a1 Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
a2 Materials Research Laboratories, Industrial Technology Research Institute, 195–5 Chung Hsing Road, Section 4 Chutung, Hsinchu, Taiwan
a3 Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
A modified high-temperature arc furnace was used to produce carbon nanotubes from carbon black by a solid-state transformation without a catalyst. The layer of carbon nanotubes thus formed was nearly pure with only a minor amount of carbon black particles. The properties of these nanotubes were found to be very similar to those produced by the conventional arc synthesis. Based on this process, a mechanism for the growth of these nanotubes is proposed. In addition, field-emission properties of these nanotubes were comparable to the properties of arc-grown carbon nanotubes.
(Received July 23 2002)
(Accepted January 27 2003)