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首页> 外文期刊>Applied Surface Science >Abnormal anti-Stokes Raman scattering and surface-enhanced infrared absorption spectroscopy studies of carbon nanotubes electrochemically functionalized with poly(2,2'-bithiophene-co-pyrene)
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Abnormal anti-Stokes Raman scattering and surface-enhanced infrared absorption spectroscopy studies of carbon nanotubes electrochemically functionalized with poly(2,2'-bithiophene-co-pyrene)

机译：聚（2,2'-联噻吩-共-）电化学功能化碳纳米管的反斯托克斯拉曼散射和表面增强红外吸收光谱的异常研究

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摘要

A new composite material was synthesized via the electrochemical oxidation of 2,2'-bithiophene (BTh) and pyrene (Py) monomers dissolved in a solution of LiClO_4 in CH_3CN onto a working electrode of Au coated with a film of single-walled carbon nanotubes (SWNTs). The interaction of the poly(2,2'-bithiophene-co-pyrene) (PBTh-Py) with the SWNTs and the orientation of the copolymer on the working electrode were studied by anti-Stokes and Stokes Raman scattering and FTIR spectroscopy in the grazing-incidence angle reflection geometry. The Raman lines at 1464 and 1435 cm~(-1), attributed to the symmetric stretching modes of the C=C bond in the quinoid and aromatic rings of the PBTh-Py copolymer, were observed when the working electrode is either a blank Au film or a Au support coated with a SWNT film. In the latter case, charge transfer occurs at the interface of the two constituents. This charge transfer leads to functionalization of the carbon nanotubes with the copolymer molecules. The presence of enhanced anti-Stokes Raman lines at -1461, -1435 and -1187 cm~(-1) indicates a resonant optical excitation process of the PBTh-Py/SWNT composite. The FTIR spectra acquired under polarized light for the PBTh-Py copolymer electrosynthesized on a bare Au support reveal significant changes in the absorption bands situated in the spectral ranges of 1000-1150 and 1550-1650 cm~(-1) that originate in the surface-enhanced IR absorption (SEIRA) processes. The functionalization of the SWNTs with the PBTh-Py copolymer is evidenced by the enhancement of the absorption of the FTIR bands at 793 and 846 cm~(-1), which are assigned to the C-S-C deformation vibrational mode and the substituted benzene ring, respectively, due to the effects of steric hindrance that are induced for the copolymer molecules by the binding of carbon nanotubes.
机译：通过将溶解在CH_3CN中的LiClO_4溶液中的2,2'-联噻吩（BTh）和pyr（Py）单体电化学氧化到涂有单壁碳纳米管薄膜的Au工作电极上，合成了一种新的复合材料（SWNT）。通过反斯托克斯和斯托克斯拉曼散射以及FTIR光谱研究了聚（2,2'-联噻吩-共the）（PBTh-Py）与单壁碳纳米管的相互作用以及共聚物在工作电极上的取向。掠入射角反射几何。当工作电极为空白Au时，观察到1464和1435 cm〜（-1）处的拉曼线归因于PBTh-Py共聚物的醌型和芳环中C = C键的对称拉伸模式。膜或镀有SWNT膜的Au支撑体。在后一种情况下，电荷转移发生在两种成分的界面处。这种电荷转移导致碳纳米管被共聚物分子官能化。 -1461，-1435和-1187 cm〜（-1）处存在增强的反斯托克斯拉曼线，表明PBTh-Py / SWNT复合材料的共振光激发过程。在偏振光下，在裸金载体上电合成的PBTh-Py共聚物的FTIR光谱揭示了在1000-1150和1550-1650 cm〜（-1）光谱范围内的吸收带的显着变化-增强的红外吸收（SEIRA）工艺。 PBTh-Py共聚物对单壁碳纳米管的功能化通过增强793和846 cm〜（-1）处FTIR谱带的吸收得以证明，这两个谱带分别被指定为CSC变形振动模式和取代的苯环。由于碳纳米管的结合对共聚物分子产生空间位阻的影响。

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  • 来源
    《Applied Surface Science》 |2014年第1期|11-21|共11页
  • 作者

    M. Baibarac; I. Baltog; I. Smaranda; M. Scocioreanu; J.Y. Mevellec; S. Lefrant;

  • 作者单位

    National Institute of Materials Physics, Lab. Optical Process in Nanostructured Materials, P.O. Box MG-7, Bucharest R077125, Romania;

    National Institute of Materials Physics, Lab. Optical Process in Nanostructured Materials, P.O. Box MG-7, Bucharest R077125, Romania;

    National Institute of Materials Physics, Lab. Optical Process in Nanostructured Materials, P.O. Box MG-7, Bucharest R077125, Romania;

    National Institute of Materials Physics, Lab. Optical Process in Nanostructured Materials, P.O. Box MG-7, Bucharest R077125, Romania;

    Institut des Materiaux 'Jean Rouxel,' 2 rue de la Houssiniere, B.P. 32229, F-44322 Nantes, France;

    Institut des Materiaux 'Jean Rouxel,' 2 rue de la Houssiniere, B.P. 32229, F-44322 Nantes, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Interface; Carbon nanotubes; Copolymer; Abnormal anti-Stokes Raman emission; FTIR spectroscopy;

    机译：接口;碳纳米管;共聚物;反斯托克斯拉曼发射异常;FTIR光谱;

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