Synchrotron-Based Temperature-Dependent Terahertz and Far-Infrared Spectroscopy of Aerographite and Single-Walled Carbon Nanotube Aerogel
Publication Name
Journal of Infrared, Millimeter, and Terahertz Waves
Abstract
Synchrotron-based terahertz and far-infrared spectra of aerographite and single-walled carbon nanotube aerogel were acquired using the terahertz/far-infrared beamline at the Australian Synchrotron in the frequency range of 7–1000 cm−1 and temperature range of 6–300 K. We observe infrared absorption features at ~ 35, ~ 79, and ~ 889 cm−1 for aerographite and ~ 35, ~ 79, ~ 685, ~ 923, and ~ 950 cm−1 for single-walled carbon nanotube aerogel. Temperature dependences of the terahertz and far-infrared spectra reveal frequency shifts of the infrared absorption peaks with temperature. The “red-shift” behavior of peak positions (~ 35 and ~ 79 cm−1) can be attributed to the anharmonicity of vibrational potentials. The ~ 35 cm−1 mode is expected to be only Raman active. Its appearance in our infrared spectra suggests that structural disorder in our samples relaxed this selection rule.
Open Access Status
This publication is not available as open access
Funding Number
AS181/THz/Far/IR/13120
Funding Sponsor
Australian Nuclear Science and Technology Organisation