A simple method for the continuous production of carbon nanotubes

A simplified arc-method is presented which allows for the continuous synthesis of multi-walled carbon nanotubes. In its basic form, the method requires only a dc power supply, a graphite electrode, and a container of liquid nitrogen with no need for pumps, seals, water-cooled vacuum chambers, or purge-gas handling systems. High-quality nanotubes are produced in high yield. The system is easily adaptable to produce large quantities of nanotubes continuously without interruptions for electrode replacement, chamber cleaning, or gas purging.