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Double-walled carbon nanotubes under hydrostatic pressure: Raman experiments and simulations

Gadagkar, V and Saha, S and Muthu, DVS and Maiti, PK and Lansac, Y and Jagota, A and Moravsky, A and Loutfy, RO and Sood, AK (2007) Double-walled carbon nanotubes under hydrostatic pressure: Raman experiments and simulations. In: Journal of Nanoscience and Nanotechnology, 7 (6). pp. 1753-1759.

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We have used Raman spectroscopy to study the behavior of double-walled carbon nanotubes (DWNT) under hydrostatic pressure. We find that the rate of change of the tangential mode frequency with pressure is higher for the sample with traces of polymer compared to the pristine sample. We have performed classical molecular dynamics simulations to study the collapse of single (SWNT) and double-walled carbon nanotube bundles under hydrostatic pressure. The collapse pressure (p(c)) was found to vary as 1/R-3, where R is the SWNT radius or the DWNT effective radius. The bundles showed similar to 30% hysteresis and the hexagonally close packed lattice was completely restored on decompression. The p, of a DWNT bundle was found to be close to the sum of its values for the inner and the outer tubes considered separately as SWNT bundles, demonstrating that the inner tube supports the outer tube and that the effective bending stiffness of DWNT, D-DWNT similar to 2D(SWNT).

Item Type: Journal Article
Publication: Journal of Nanoscience and Nanotechnology
Publisher: American Scientific Publishers
Additional Information: Copyright of this article belongs to American Scientific Publishers.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 03 Aug 2007
Last Modified: 02 Feb 2012 09:25
URI: http://eprints.iisc.ac.in/id/eprint/11643

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