Electrochemical tuning and mechanical resilience of single-wall carbon nanotubes

Ghosh, Shankar and Teredesai, Pallavi V and Sood, AK (2002) Electrochemical tuning and mechanical resilience of single-wall carbon nanotubes. In: Pure and Applied Chemistry, 74 (9). 1719-1730 .

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Abstract

Single-wall carbon nanotubes (SWNTs) are fascinating systems exhibiting many novel physical properties. In this paper, we give a brief review of the structural, electronic, vibrational, and mechanical properties of carbon nanotubes. In situ resonance Raman scattering of SWNTs investigated under electrochemical biasing demonstrates that the intensity of the radial breathing mode varies significantly in a nonmonotonic manner as a function of the cathodic bias voltage, but does not change appreciably under anodic bias. These results can be quantitatively understood in terms of the changes in the energy gaps between the 1 D van Hove singularities in the electron density of states, arising possibly due to the alterations in the overlap integral of pi bonds between the p-orbitals of the adjacent carbon atoms. In the second part of this paper, we review our high-pressure X-ray diffraction results, which show that the triangular lattice of the carbon nanotube bundles continues to persist up to similar to10 GPa. The lattice is seen to relax just before the phase transformation, which is observed at similar to10 GPa. Further, our results display the reversibility of the 2D lattice symmetry even after compression up to 13 GPa well beyond the 5 GPa value observed recently. These experimental results explicitly validate the predicted remarkable mechanical resilience of the nanotubes.

Item Type:	Journal Article
Publication:	Pure and Applied Chemistry
Publisher:	International Union of Pure and Applied Chemistry
Additional Information:	Copyright of this article belongs to International Union of Pure and Applied Chemistry.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	20 Jul 2011 06:20
Last Modified:	20 Jul 2011 06:20
URI:	http://eprints.iisc.ac.in/id/eprint/39169

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