We present calculations of the breathing mode phonon frequencies of 4He and H2 physically adsorbed on the outside surface of one or more carbon nanotubes. Two geometries are considered. The first is a single, isolated nanotube, upon which the gas is adsorbed as a commensurate phase. The second is a quasi-one-dimensional "groove" phase nestled between two nanotubes. While the computed breathing mode frequencies depend on nanotube radius and the adsorbate, in general, they are of the same order of magnitude as those of the bare nanotubes.
S. M. Gatica et al., "Vibrational Modes of ⁴He and H₂ Gases Adsorbed on Carbon Nanotubes," Physical review B: Condensed matter and materials physics, vol. 76, no. 8, American Physical Society (APS), Aug 2007.
The definitive version is available at https://doi.org/10.1103/PhysRevB.76.085406
Chemical and Biochemical Engineering
National Science Foundation (U.S.)
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