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Double-Walled Carbon Nanotubes under Hydrostatic Pressure: Raman Experiments and Simulations

Gadagkar, Vikram and Saha, Surajit and Muthu, D. V. S. and Maiti, Prabal K. and Lansac, Yves and Jagota, Anand and Moravsky, Alexander and Loutfy, R. O. and Sood, A. K. (2007) Double-Walled Carbon Nanotubes under Hydrostatic Pressure: Raman Experiments and Simulations. In: International Conference on Nano Science and Technology, (ICONSAT 2006), 16 to 18 March 2006, New Delhi, India.

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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 $\sim$ 30 \% hysteresis and the hexagonally close packed lattice was completely restored on decompression. The $p_{c}$ 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, $D_{DWNT}{\sim}2D_{SWNT}$.

Item Type:Conference or Workshop Item (Poster)
Additional Information:doi:10.1166/jnn.2007.710
Subjects:Physical Science > Nanophysics
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
ID Code:9618
Deposited By:Dr Surajit Saha
Deposited On:10 Sep 2010 15:42
Last Modified:10 Sep 2010 15:42

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