Visible-Ultraviolet Polarized Reflectivity Spectra of Anisotropically Aligned Single-Walled Carbon Nanotube Films

概要

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We have measured the visible-ultraviolet polarized reflectivity of anisotropically aligned single-walled carbon nanotubes between 1.5 and 6 eV. We observed distinctively distinguished reflectivities from two types of single-walled carbon nanotubes, synthesized with and without sulfur. The reflectivity of single-walled carbon nanotube films synthesized with sulfur was fitted under the assumption of the lineshape of Drude conductivity, whereas that of single-walled carbon nanotubes synthesized without sulfur was fit using the lineshape formula of simple harmonic oscillators for dielectric function. We observed several peaks in the harmonic-oscillator-type reflectivity spectra, which we assigned to $\pi$ band electronic transitions. Difference spectra of the parallel and perpendicular polarization components of the reflectivities with respect to the nanotube axis revealed anisotropic features associated with the $\pi$ band electronic transitions in the carbon nanotubes of both types. We identified the harmonic-oscillator-type and the Drude-type single-wall carbon nanotubes as semiconductor-like and metal-like ones, respectively.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-09-15