Baibarac M, Baltog I, Mihut L, Mevellec J Y, Lefrant S
National Institute of Materials Physics, Lab. Optics and Spectroscopy, Bucharest, PO Box MG-7, R-77125, Romania.
J Nanosci Nanotechnol. 2009 Oct;9(10):6195-203. doi: 10.1166/jnn.2009.1547.
The electrochemical polymerization of N-ethyl carbazole (EK) on carbon nanotubes (CNs) films immersed in a LiClO4/acetonitrile solution was studied by cyclic voltammetry. Cyclic voltammograms recorded on a blank Pt electrode were compared with those obtained when CNs films were deposited on a Pt plate. In the latter case, the oxidation maximum is not clearly observed. Using the Raman scattering studies, oligomers of poly(N-ethyl carbazole) (PEK) on CNs are shown to be formed. A covalent functionalization of CNs with the PEK oligomers is demonstrated by FTIR spectroscopy studies. The formation of new C-C covalent bonds between CNs and the benzene ring of PEK induces steric hindrance effects that are shown in FTIR spectra by the increase in the intensity of the absorption band at 1072 cm(-1) attributed to the vibration of C-H in plane deformation of aromatic ring. The influence of the monomer and the supporting electrolyte concentration as well as the sweep rate on the polymerization conditions in the case of the composites based on the PEK oligomers and CNs were also investigated.
通过循环伏安法研究了在浸入高氯酸锂/乙腈溶液中的碳纳米管（CNs）薄膜上N-乙基咔唑（EK）的电化学聚合。将在空白铂电极上记录的循环伏安图与在铂板上沉积CNs薄膜时获得的循环伏安图进行比较。在后一种情况下，未清楚观察到氧化最大值。利用拉曼散射研究表明，在CNs上形成了聚（N-乙基咔唑）（PEK）的低聚物。通过傅里叶变换红外光谱（FTIR）研究证明了CNs与PEK低聚物的共价功能化。CNs与PEK苯环之间新的C-C共价键的形成引起了空间位阻效应，这在FTIR光谱中表现为归因于芳香环平面内C-H振动的1072 cm(-1)处吸收带强度的增加。还研究了单体、支持电解质浓度以及扫描速率对基于PEK低聚物和CNs的复合材料聚合条件的影响。
