Polarized raman study of aligned multiwalled carbon nanotubes |
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Authors: | Rao Jorio Pimenta Dantas Saito Dresselhaus Dresselhaus |
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Affiliation: | Center for Applied Energy Research, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA. |
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Abstract: | 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. |
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