Wide-range optical studies on various single-walled carbon nanotubes: Origin of the low-energy gap
Wide-range optical studies on various single-walled carbon nanotubes: Origin of the low-energy gap
We present wide-range (3 meV--6 eV) optical studies on freestanding transparent carbon nanotube films, made from nanotubes with different diameter distributions. In the far-infrared region, we found a low-energy gap in all samples investigated. By a detailed analysis we determined the average diameters of both the semiconducting and metallic species …