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EPR study of charge transfer in polyaniline highly doped by p-toluenesulfonic acid

机译：EPR研究对甲苯磺酸重掺杂的聚苯胺中的电荷转移

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摘要

Magnetic, relaxation and electronic dynamic parameters of paramagnetic centers in crystalline domains of polyaniline highly doped by p-toluenesulfonic acid (PANI-PTSA) as well as PANI-PTSA dispersed in poly(methyl methacrylate) were studied by the 3 cm (9.7 GHz) and 2 mm (140 GHz) wavebands EPR. These centers demonstrate the Lorentzian single line with the Dysonian contribution at both wavebands indicating intrinsic conductivity of metal-like domains near 1500-4000 S/cm at room temperature. Effective conductivity of the polymer is defined by Q3D delocalization of charge carriers within such domains and their Mott variable range hopping between the domains dominating its micro- and macroscopic conductivity. It was shown that the interaction of the charge carriers with the lattice phonons governs intradomain charge transfer at high temperatures. Reversible dipolare interaction of paramagnetic centers with oxygen was revealed. This interaction depends on electron precession frequency and/or on the PANI-PTSA dispersion in an insulating matrix. Charge transfer in PANI-PTSA was analyzed to be non-correlated with spin relaxation and dynamics that evidences the formation of Q3D metal-like domains contrary to the "single conducting chain" model.
机译：在3 cm（9.7 GHz）上研究了对甲苯磺酸（PANI-PTSA）以及分散在聚（甲基丙烯酸甲酯）中的PANI-PTSA高度掺杂的聚苯胺晶体域中顺磁中心的磁，弛豫和电子动力学参数。和2毫米（140 GHz）波段EPR。这些中心展示了在两个波段都具有戴森效应的洛伦兹单线，表明在室温下接近1500-4000 S / cm的类金属畴的固有电导率。聚合物的有效电导率由这些域内的电荷载流子的Q3D离域作用以及它们在域的微观和宏观电导率之间的Mott可变范围跳变定义。结果表明，载流子与晶格声子的相互作用决定了高温下的畴内电荷转移。揭示了顺磁性中心与氧的可逆偶极相互作用。这种相互作用取决于电子进动频率和/或绝缘基质中的PANI-PTSA分散度。分析了PANI-PTSA中的电荷转移与自旋弛豫和动力学无关，这证明了与“单传导链”模型相反的Q3D类金属结构域的形成。

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