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

Abstract

The electronic properties of as-prepared and purified unoriented single-walled carbon nanotube films were studied by transmission measurements over a broad frequency range (far-infrared up to visible) as a function of temperature (15 K - 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 $\sim$2 GPa due to a structural phase transition.

13 pages, 15 figures

References in corpus (8)

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Cited by in corpus (5)

• Buckling of Carbon Nanotubes: A State of the Art Review
• Influence of nanotube length and density on the plasmonic terahertz response of single-walled carbon nanotubes
• On the atomistic energetics of carbon nanotube collapse from AIREBO potential
• Stabilization of carbon nanotubes by filling with inner tubes: An optical spectroscopy study on double-walled carbon nanotubes under hydrostatic pressure
• Shape transition of unstrained flattest single-walled carbon nanotubes under pressure