Surface enhanced Raman scattering studies on poly(3,4-ethylene dioxythiophene)/single-walled carbon nanotubes composites and their application to rechargeable lithium batteries

I Baltog; M Baibarac; S Lefrant; P Gomez-Romero

doi:10.1166/jnn.2009.1548

Surface enhanced Raman scattering studies on poly(3,4-ethylene dioxythiophene)/single-walled carbon nanotubes composites and their application to rechargeable lithium batteries

J Nanosci Nanotechnol. 2009 Oct;9(10):6204-9. doi: 10.1166/jnn.2009.1548.

Authors

I Baltog¹, M Baibarac, S Lefrant, P Gomez-Romero

Affiliation

¹ National Institute of Materials Physics, Lab. Optics and Spectroscopy, Bucharest, PO Box MG-7, R-77125, Romania.

PMID: 19908516
DOI: 10.1166/jnn.2009.1548

Abstract

In this paper, surface enhanced Raman scattering (SERS) studies on the chemical polymerization of 3,4-ethylene dioxythiophene (EDOT) in the presence of single-walled carbon nanotubes (SWNTs) are reported. Both a non-covalent and covalent functionalization of SWNTs with poly(3,4-ethylene dioxythiophene) (PEDOT) is invoked as a result of the following variations induced in the SERS spectra of PEDOT and SWNTs: (i) the appearance of a Raman line at 140 cm(-1) indicating the formation of a new covalent bond between PEDOT and SWNTs; (ii) an increase in the intensity of the Raman line at 705 cm(-1), associated with the deformation vibration mode of C-S-C bond, the result of a steric hindrance effect induced by the bonding of PEDOT on SWNTs; and (iii) the enhancement of the Raman band with maximum at 1540 cm(-1) (G- component) in SWNTs when the PEDOT weight in the PEDOT/SWNTs composite increases. Using the PEDOT/SWNTs composite as a positive electrode and an electrolytic solution containing LiPF6, the charge-discharge characteristics of the rechargeable lithium cells are determined. High specific discharge capacity are reported for the PEDOT/SWNTs composite (ca. 218 mAh g(-1)) in comparison with PEDOT doped with FeCl4- ions (ca. 25 mAh g(-1)).