Journal article
Electron spin resonance and Raman scattering spectroscopy of multi-walled carbon nanotubes: A function of acid treatment
T Pietraß, JL Dewald, CFM Clewett, D Tierney, AV Ellis, S Dias, A Alvarado, L Sandoval, S Tai, SA Curran
Journal of Nanoscience and Nanotechnology | AMER SCIENTIFIC PUBLISHERS | Published : 2006
DOI: 10.1166/jnn.2006.058
Abstract
We compare the fundamental transport mechanism in multi-walled carbon nanotubes (MWNTs) by means of electron spin resonance (ESR) and Raman spectroscopy as a function of acid treatment. The ESR and Raman results show that the acid treatment reduces the density of states at the Fermi level. Defects introduced through the acid treatment move the Fermi level closer to the K points in the valence band, and consequently conduction is reduced. These defects are identified as Stone-Wales type from the Raman results. Copyright © 2006 American Scientific Publishers All rights reserved.