Strong anisotropy in the far-infrared absorption spectra of stretch-aligned single-walled carbon nanotubes

Nima Akima, Yoshihiro Iwasa, Sonal Brown, Andi M. Barbour, Jinbo Cao, Janice L. Musfeldt, Hiroshi Matsui, Naoki Toyota, Masashi Shiraishi, Hideo Shimoda, Otto Zhou

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)

Abstract

The characteristic features of strong anisotropy in the far-infrared absorption spectra in the stretch-aligned single-walled carbon nanotubes (SWNT), were analyzed. Two kinds of SWNTs such as laser-ablation-grown SWNTs and available high-pressure CO disproportionation SNWTs. The degree of orientation of the samples has been determined by polarized Raman spectroscopy utilizing a He-Ne laser excitation source. Scanning electron microscopy images show that the sprayed films have a spaghetti-like morphology, with curved, sinuated, and crossed SWNT bundles. The far-infrared peak is strongly polarized parallel to the tube direction, and displays remarkable morphology dependence, in sharp contrast to the morphology-intensive spectra in the near-infrared region and above of the electromagnetic spectrum.

Original languageEnglish
Pages (from-to)1166-1169
Number of pages4
JournalAdvanced Materials
Volume18
Issue number9
DOIs
Publication statusPublished - 2006 May 2

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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