Abstrait

Study of Graphite DC ARC and the Structural Studies of Carbon Nanotubes Prepared in the DC ARC

Zuhoor Elahi

A study of DC Arc plasma column during the preparation of carbon nanotubes is presented. Such study was planned to study the experimental parameters, which influence the formation of nano-structures. Excitation temperatures are measured by using the intensities of consecutive ionization states in the line spectrum. The dependence of excitation temperature on delay time is calculated and shown graphically. Electron densities are also calculated at different times in the arc plasma and are found to be decreasing exponentially as the plasma gets cool down. Carbon nanotubes that are formed during the arc are collected from the cathode in the form of soot and studied for morphology, composition, and structural properties. It is found that the nanotubes formed are of multiwalled nature.