Pressure coefficients of Raman modes of carbon nanotubes resolved by chirality: Environmental effect on graphene sheet

Autor:	Ghandour, A. J., Crowe, I. F., Proctor, J. E., Sun, Y. W., Halsall, M. P., Hernandez, I., Sapelkin, A., Dunstan, D. J.
Rok vydání:	2012
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.87.085416
Popis:	Studies of the mechanical properties of single-walled carbon nanotubes are hindered by the availability only of ensembles of tubes with a range of diameters. Tunable Raman excitation spectroscopy picks out identifiable tubes. Under high pressure, the radial breathing mode shows a strong environmental effect shown here to be largely independent of the nature of the environment . For the G-mode, the pressure coefficient varies with diameter consistent with the thick-wall tube model. However, results show an unexpectedly strong environmental effect on the pressure coefficients. Reappraisal of data for graphene and graphite gives the G-mode Grueuneisen parameter gamma = 1.34 and the shear deformation parameter beta = 1.34. Comment: Submitted to Physical Review B
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1208.0725 Zobrazit plný text záznamu View this record from Arxiv