Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

January 2001

Comments

Postprint version. Published in Chemical Physics Letters, Volume 333, Issues 1-2, 5 January 2001, pages 16-22.
Publisher URL: http://dx.doi.org/10.1016/S0009-2614(00)01335-X

Abstract

Electrochemical doping and in-situ Raman scattering were used to study charge transfer in K- and Li-doped single wall carbon nanotubes (SWNT) as a function of alkali concentration. An 8 cm-1 downshift was observed for the tangential phonon mode of SWNT doped to stoichiometries of KC24 and Li1.25C6. The shift in both systems is reversible upon de-doping despite an irreversible loss of crystallinity. These results indicate that the tangential mode shifts result from electron transfer from alkali dopants to the SWNT, and that these modes are only weakly affected by long-range order within the ropes.

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Date Posted: 31 July 2005

This document has been peer reviewed.