Pressure coefficients of Raman modes of carbon nanotubes resolved by chirality: Environmental effect on graphene sheet
PHYSICAL REVIEW B
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Studies of the mechanical properties of single-walled carbon nanotubes are hindered by their availability only as ensembles of tubes with a range of diameters. However, tunable Raman spectroscopy is capable of identifying individual tubes from such ensembles. Interestingly, both the radial breathing mode and, surprisingly, the G -mode pressure coefficients exhibit strong environmental effects, which are largely independent of the nature of the environment. We show that the G -mode pressure coefficient varies with diameter, consistent with the thick-wall tube model. Reappraisal of literature data for graphene and graphite suggests revision of both the G -mode Grüneisen parameter γ and the shear deformation parameter β toward the value of 1.34.
AuthorsGhandour, AJ; Crowe, IF; Proctor, JE; Sun, YW; Halsall, MP; Hernandez, I; Sapelkin, A; Dunstan, DJ
- Physics and Astronomy