Characterization and optimization of the Streaming Neutral Gas Injection (SNGI) facility

Abstract

A dc plasma with a hollow carbon cathode designed for the fabrication of carbon nanotubes (CNTs) which operates in glow and arc discharge was made operational. The factors ideal for CNTs production are investigated. Acetylene gas mixed with H₂, N₂ and Ar is injected into the system through the carbon cathode. Stability, which is a vital factor in CNT formation, is established. and the factors for stability are identified. It was determined that magnetic field, bias voltage, electrode distance, working pressure and the amount of gas mixture are the factors that affect stability of the device. The presence of the C₂ dimer that is vital for CNTs formation was also observed in the spectrographs.