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Resonance Raman Spectroscopy of Conducting Polypyrrole Nanotubes: Disordered Surface versus Ordered Body
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2018-11-12 00:00:00 , DOI: 10.1021/acs.jpca.8b09794 Miroslava Trchová 1 , Jaroslav Stejskal 1
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2018-11-12 00:00:00 , DOI: 10.1021/acs.jpca.8b09794 Miroslava Trchová 1 , Jaroslav Stejskal 1
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Polypyrrole nanotubes rank among the most conducting forms of organic semiconductors. They are prepared by the oxidation of pyrrole in the presence of methyl orange. Other organic dyes, viz. ethyl orange, Acid Blue 25, and Acid Blue 129, have been used in the present study to prepare globules or nanofibers. The resulting polypyrroles were studied in detail by Raman spectroscopy. The apparent paradox when a dye contribution to spectra is absent with 785 nm excitation line and present with shorter wavelengths is explained by the resonance character of the Raman scattering, which allows the separation of the contributions from the polypyrrole surface and from the bulk. These differ depending on the laser excitation wavelength and the position of absorption maximum of the individual dyes in ultraviolet–visible spectra and affect both the laser-penetration depth and observation of the resonance effect. The spectra are discussed in terms of different ordering of polymer chains in individual morphologies. The correlation between conductivity, surface areas, and the proportions of ordered and disordered polypyrrole phases at the surface and in the interior of nanostructures is proposed and established using resonance Raman spectroscopy.
中文翻译：
导电聚吡咯纳米管的共振拉曼光谱：无序表面与有序体
聚吡咯纳米管是最导电的有机半导体形式之一。它们是通过在甲基橙存在下将吡咯氧化而制得的。其他有机染料，即。乙基橙，酸性蓝25和酸性蓝129在本研究中已用于制备小球或纳米纤维。通过拉曼光谱法详细研究了所得的聚吡咯。当拉曼散射的共振特征解释了当染料在785 nm激发线处不存在对光谱的贡献时出现的明显悖论，这是通过拉曼散射的共振特征来解释的，该特征允许从聚吡咯表面和主体中分离出贡献。这些取决于激光激发波长和紫外线可见光谱中每种染料的最大吸收位置，并会影响激光的穿透深度和共振效应的观察。根据各个形态中聚合物链的不同顺序讨论了光谱。使用共振拉曼光谱法提出并建立了电导率，表面积以及在纳米结构的表面和内部的有序和无序聚吡咯相的比例之间的相关性。
更新日期：2018-11-12
中文翻译：
导电聚吡咯纳米管的共振拉曼光谱：无序表面与有序体
聚吡咯纳米管是最导电的有机半导体形式之一。它们是通过在甲基橙存在下将吡咯氧化而制得的。其他有机染料，即。乙基橙，酸性蓝25和酸性蓝129在本研究中已用于制备小球或纳米纤维。通过拉曼光谱法详细研究了所得的聚吡咯。当拉曼散射的共振特征解释了当染料在785 nm激发线处不存在对光谱的贡献时出现的明显悖论，这是通过拉曼散射的共振特征来解释的，该特征允许从聚吡咯表面和主体中分离出贡献。这些取决于激光激发波长和紫外线可见光谱中每种染料的最大吸收位置，并会影响激光的穿透深度和共振效应的观察。根据各个形态中聚合物链的不同顺序讨论了光谱。使用共振拉曼光谱法提出并建立了电导率，表面积以及在纳米结构的表面和内部的有序和无序聚吡咯相的比例之间的相关性。
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