Low temperature growth of single-walled carbon nanotubes from Pt catalysts under low ethanol pressure by alcohol gas source method

Abstract

Growth of single-walled carbon nanotubes (SWNTs) was carried out on SiOSi substrates with Pt catalysts at 400, 450, and 700°C under various ethanol pressures using an alcohol gas source method in a high vacuum, and the grown SWNTs were characterized by scanning electron microscopy (SEM) and Raman spectroscopy. Irrespective of the growth temperature, both G band and RBM peaks were observed in the Raman spectra under the optimal ethanol pressure ( 1 × 10 - 3 Pa), indicating that SWNTs grew below 450°C from Pt. At 400°C, both average diameter and diameter distribution were drastically reduced, and those were fairly smaller and narrower, compared to those for SWNTs grown with Co. © 2012 Hiroki Kondo et al.