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Unusual dependence of raman mode frequency on excitation wavelength in graphite and single walled carbon nanotubes

Sood, AK and Munro, CH and Asher, SA and Gupta, R (1999) Unusual dependence of raman mode frequency on excitation wavelength in graphite and single walled carbon nanotubes. [Book Chapter]

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Official URL: http://books.google.co.in/books?hl=en&lr=&id=su0fe...

Abstract

In this paper we report resonance Raman scattering from graphite covering excitation energies in the range 2.4 eV to 6 eV. The Raman excitation profile shows a maximum at 4.94 eV (lambda = 251nm) for the G - band (1582 cm(-1)). The D-band at similar to 1350 cm(-1), attributed to disorder activated Raman scattering, does not show up in Raman spectra recorded with excitation wavelengths smaller than 257.3 nm, revealing that the resonance enhancements of the G and D-modes are widely different. Earlier Raman measurements in carbon materials have also revealed a very large and unusual dependence of the D - mode frequency on excitation laser wavelength. This phenomenon is also observed in carbon nanotubes. In this paper we show for the first time that the above unusual dependence arises from the disorder - induced double resonance mechanism.

Item Type: Book Chapter
Additional Information: Copyright of this article belongs to Universities Press india Ltd.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Apr 2012 08:00
Last Modified: 12 Apr 2012 08:00
URI: http://eprints.iisc.ernet.in/id/eprint/43892

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