Method and apparatus for producing filamentary structures. The structures include single-walled nanotubes. The method includes combusting hydrocarbon fuel and oxygen to establish a non-sooting flame and providing an unsupported catalyst to synthesize the filamentary structure in a post-flame region of the flame. Residence time is selected to favor filamentary structure growth.
This invention was made with government support under Grant Number DE-FG02-84ERT3282, awarded by the Department of Energy. The United States government has certain rights in the invention.