Polarized raman study of aligned multiwalled carbon nanotubes
Polarized Raman spectra of high purity aligned arrays of multiwalled carbon nanotubes, prepared on silica substrates from the thermal decomposition of a ferrocene-xylene mixture, show a strong dependence of the graphitelike G band and the disorder-induced D band on the polarization geometry employed in the experiments. The experimental G-band intensity exhibits a minimum at straight theta(m) = 55 degrees in the VV configuration, in good agreement with theoretical predictions of a characteristic minimum at 54.7 degrees for A(1g) modes in single wall nanotubes, where straight theta(m) denotes the angle between the polarization direction and the nanotube axis.
Rao
AM
Center for Applied Energy Research, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA.
Jorio
A
Pimenta
MA
Dantas
MS
Saito
R
Dresselhaus
G
Dresselhaus
MS