Resonance Raman spectroscopy of carbon nanotubes: pressure effects on G-mode

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 consis...

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Bibliographic Details
Published in:	High pressure research Vol. 34; no. 2; pp. 191 - 197
Main Authors:	Sun, Y.W., Hernández, I., Ghandour, A.J., Rice, C., Crowe, I.F., Halsall, M.P., Sapelkin, A., Gonzalez, J., Rodriguez, F., Dunstan, D.J.
Format:	Journal Article
Language:	English
Published:	Abingdon Taylor & Francis 03-04-2014 Taylor & Francis Ltd
Subjects:	Carbon carbon nanotubes Diamonds Evolution G-plus and G-minus Hexanes high pressure Lasers Mathematical models Nanotubes Pressure pressure media Raman spectroscopy Resonance Raman spectroscopy Single wall carbon nanotubes Spectrum analysis Tubes
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Summary:	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.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0895-7959 1477-2299
DOI:	10.1080/08957959.2013.878714