Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/684
Title: Pressure Behaviour of SingleWall Carbon Nanotube Bundles and Fullerenes: A Raman Study
Authors: Sood, A K
Teresdesai, Pallavi V
Muthu, D V S
Sen, Rahul
Govindaraj, A
Rao, C N R
Keywords: Induced Amorphization
Phase-Transitions
Vibrational-Modes
C-70
C-60
Photoluminescence
Crystals
Ropes
Temperature
Diffraction
Issue Date: Sep-1999
Publisher: WILEY-VCH Verlag GmbH
Citation: Physica Status Solidi B-Basic Research 215(1), 393-401 (1999)
Abstract: We shall discuss our recent high pressure Raman studies on single wall carbon nanotube (SWNT) bundles and compare them with pressure-induced amorphous and polymeric phases of crystalline C-60 and C-70 Our high pressure Raman studies on SWNT bundles carried out upto 25.9 GPa show that the intensities of both the radial modes (w approximate to 170 cm(-1)) as well as tangential modes (around 1590 cm(-1)) decrease significantly with pressure, so much that the radial modes cannot be observed beyond 2.6 GPa. Most interestingly, the frequency of the dominant tangential mode increases upto 11 GPa, then decreases till 16 GPa and again increases. Raman spectra were resolved into four modes upto 10 GPa beyond which only one or two modes could be fitted to the recorded spectra. The pressure-softening of the mode between 11 and 16 GPa as well as other features of the Raman spectra are reversible in the decreasing pressure cycle. These results, though not understood at present, can be associated with the distortion of the circular cross-section of the tubes in the bundle, eventually leading to a possible transition of the SWNT bundle to graphite like carbon at II GPa which is completed at 16 GPa. This transition is reversible on decompression.
Description: Restricted Access
URI: http://hdl.handle.net/10572/684
Other Identifiers: 0370-1972
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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