Study on the DC supply and charging effect on the growth of carbon nanotubes and their electrochemical properties

Preparation of chirality-defined few-walled CNT (FWCNT) is one of the major challenges in the carbon nanotube (CNT) fields. In the last two decades, significant progress has been made in preparing chirality-controlled synthesis (CCS) of FWCNT through both a direct synthesis approach and a post-synthesis separation approach due to insignificant changes in the tube diameter and twist angle. Hopefully, the present study will encourage further research on the preparation of FWCNT and also utilize key research and practical applications of FWCNTs. In this study, the SEM images of as-grown nanotubes show that applying electric field during the growth process affects the growth of the nanotubes and nanotubes properties can be achieved and altered by changing the supplied electrical DC bias. Raman spectroscopy has been used to analyze the structure and forms of grown FWCNTs samples. The Raman spectrum from all obtained CNTs samples shows the presence of major two peaks, corresponding to the 1350 cm⁻¹ and 1570 cm⁻¹ bands as well as characteristic Raman bands for metallic or semi-conductive CNTs and their corresponding electrochemical performance also have been performed.