Higher coverage gas adsorption on the surface of carbon nanotubes: evidence for a possible new phase in the second layer.
We present adsorption isotherm results for Ne, CH4, and Xe on bundles of close-ended single-wall carbon nanotubes, for coverages above the completion of the first layer. We find a small, sharp, substep present in the second-layer data for Ne and CH4, and a weaker feature, that produces an isothermal compressibility peak, for Xe. The size and location of the feature allows its tentative identification as a new, second-layer, one-dimensional phase, in which the atoms sit atop high binding energy sites in the second layer.
Talapatra
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Department of Physics, Southern Illinois University, Carbondale 62901, USA.
Krungleviciute
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Migone
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