Absorption spectra of high purity metallic and semiconducting single-walled carbon nanotube thin films in a wide energy region

作者：Ichida Masao^*; Saito Shingo; Nakano Tadashi; Feng Ye; Miyata Yasumitsu; Yanagi Kazuhiro; Kataura Hiromichi; Ando Hiroaki

来源：Solid State Communications, 2011, 151(22): 1696-1699.

DOI：10.1016/j.ssc.2011.07.046

• Single-walled carbon nanotubes
• THz absorption spectra

Absorption spectra of high purity metallic and semiconducting single-walled carbon nanotubes separated by the density-gradient ultracentrifugation method have been measured in the wide energy region from 1 meV to 5 eV. In the high purity metallic nanotube sample, a strong and broad absorption band has been observed at 0.06 eV. This observation suggests that the optical properties of even high purity metallic nanotube bundles cannot be explained by the simple Drude conduction model. We discuss the origin of these absorption bands for metallic and semiconducting nanotube samples by considering the existence of a small energy gap in metallic nanotube bundles and plasmon resonance.

• 出版日期2011-11