Pressure-induced phenomena in single-walled carbon nanotubes probed by infrared spectroscopy

The electronic properties of films of unoriented single-walled carbon nanotubes were studied by transmission measurements as a function of pressure. The energies of the optical transitions between the Van Hove singularities decrease with increasing pressure, which can be attributed to pressure-induced hybridization and symmetry-breaking effects. We observe an anomaly in the pressure-induced shift of the optical transitions at around 2 GPa due to a structural phase transition. The low-energy absorbance monotonically decreases with increasing pressure, suggesting an increasing carrier localization.

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