Resonance Raman spectroscopy of carbon nanotubes: pressure effects on G-mode |
| |
| Authors: | Y.W. Sun I. Hernández A.J. Ghandour C. Rice I.F. Crowe M.P. Halsall |
| |
| Affiliation: | 1. School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, UK;2. MALTA Consolider Team, Departamento CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain;3. School of Arts and Sciences, Lebanese International University, Beirut-Mazraa 146404, Lebanon;4. School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK;5. Photon Sciences Institute and School of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, UK |
| |
| Abstract: | ![]()
We use 488 and 568 nm laser Raman spectroscopy under high pressure to selectively follow evolution of Raman G-mode signals of single-walled carbon nanotubes (SWCNTs) of selected diameters and chiralities ((6, 5) and (6, 4)). The G-mode pressure coefficients of tubes from our previous work are consistent with the thick-wall tube model. Here we report the observation of well-resolved G-minus peaks in the Raman spectrum of SWCNTs in a diamond-anvil cell. The pressure coefficients of these identified tubes in water, however, are unexpected, having the high value of over 9 cm?1 GPa?1 for the G-plus and the G-minus, and surprisingly the shift rates of the same tubes in hexane have clearly lower values. We also report an abrupt increase of G-minus peak width at about 4 GPa superposed on a continuous peak broadening with pressure. |
| |
| Keywords: | carbon nanotubes Resonance Raman spectroscopy high pressure G-plus and G-minus pressure media |
|
|
