Abstract
We present the pressure-dependent infrared absorbance spectra of unoriented single-walled carbon nanotube films for pressures up to 8 GPa. Various pressure transmitting media (helium, argon, CsI, and alcohol mixture) were employed to verify the influence of the pressure medium on the observed pressure effects. For all pressure transmitting media, a pressure-induced redshift of the absorption bands is observed, with an anomaly at the critical pressure Pc = 2−3 GPa. This anomaly can be attributed to the circular-to-oval structural phase transition. The pressure transmitting medium only affects the results quantitatively, namely, the value of Pc and the broadening of the bands.
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