Nano Archive

Development of the tangential mode in the Raman spectra of SWCNT bundles during electrochemical charging

Kalbac, M and Kavan, L and Dunsch, L and Dresselhaus, Mildred S. (2008) Development of the tangential mode in the Raman spectra of SWCNT bundles during electrochemical charging. NANO LETTERS, 8 (4). pp. 1257-1264.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://pubs.acs.org/doi/abs/10.1021/nl073104h

Abstract

The detailed analysis of the in situ Raman spectroelectrochemical behavior of single walled carbon nanotube (SWCNT) bundles is presented. The Raman modes of metallic SWCNTs exhibit striking changes even before the potential of the first van Hove singularity is achieved. Special attention has been paid to the development of the tangential (TG) mode broadening, which subsequently vanishes if the potential is shifted away from V = 0. The tangential mode band has been fitted by four components. During the electrochemical doping, three components of the tangential mode follow the predictions of a theoretical model for the LO modes of metallic tubes based on the Kohn anomaly. On the other hand, the behavior of the fourth component is consistent with a model based on electron-plasmon coupling. The TO mode of metallic tubes has been identified only at a doping level corresponding to 1.0 V or above. Our results also indicate an asymmetry in the behavior of the TG mode for positive electrode potentials relative to negative ones.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Analytical Science > Microscopy and probe methods
Physical Science > Nano objects
ID Code:2424
Deposited By:Farnush Anwar
Deposited On:07 Jan 2009 13:30
Last Modified:26 Mar 2009 14:06

Repository Staff Only: item control page