Infrared spectroscopic studies on unoriented single-walled carbon nanotube films under hydrostatic pressure

K. Thirunavukkuarasu, F. Hennrich, K. Kamarás, C. A. Kuntscher

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The electronic properties of as-prepared and purified unoriented single-walled carbon nanotube (SWCNT) films were studied by transmission measurements over a broad frequency range (far-infrared up to visible) as a function of temperature (15-295 K) and external pressure (up to 8 GPa). Both the as-prepared and the purified SWCNT films exhibit nearly temperature-independent properties. With increasing pressure the low-energy absorbance decreases suggesting an increasing carrier localization due to pressure-induced deformations. The energy of the optical transitions in the SWCNTs decreases with increasing pressure, which can be attributed to pressure-induced hybridization and symmetry-breaking effects. We find an anomaly in the pressure-induced shift of the optical transitions at ∼2GPa due to a structural phase transition.

Original languageEnglish
Article number045424
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number4
DOIs
Publication statusPublished - Jan 22 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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