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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jan 22 2010|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics