Baltog I, Baibarac M, Lefrant S, Gomez-Romero P
National Institute of Materials Physics, Lab. Optics and Spectroscopy, Bucharest, PO Box MG-7, R-77125, Romania.
J Nanosci Nanotechnol. 2009 Oct;9(10):6204-9. doi: 10.1166/jnn.2009.1548.
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)).
本文报道了在单壁碳纳米管（SWNTs）存在下，对3,4-亚乙基二氧噻吩（EDOT）化学聚合的表面增强拉曼散射（SERS）研究。聚（3,4-亚乙基二氧噻吩）（PEDOT）对SWNTs的非共价和共价功能化作用，源于PEDOT和SWNTs的SERS光谱中出现的以下变化：（i）在140 cm⁻¹处出现拉曼线，表明PEDOT和SWNTs之间形成了新的共价键；（ii）与C-S-C键的变形振动模式相关的705 cm⁻¹处拉曼线强度增加，这是PEDOT与SWNTs结合引起的空间位阻效应的结果；（iii）当PEDOT/SWNTs复合材料中PEDOT的重量增加时，SWNTs中在1540 cm⁻¹处具有最大强度的拉曼带（G分量）增强。使用PEDOT/SWNTs复合材料作为正极和含有LiPF6的电解液，测定了可充电锂电池的充放电特性。与掺杂FeCl4⁻离子的PEDOT（约25 mAh g⁻¹）相比，PEDOT/SWNTs复合材料具有较高的比放电容量（约218 mAh g⁻¹）。
