Abstract

The effect of doping of conjugated polyaminoarenes on their structure and optical absorption in the visible and near IR spectral range were studied. The films of polyaniline (PAN), poly-ortho-toluidine (PoTI) and poly-ortho-anisidine (PoA) on the transparent tin oxide substrates were prepared by electrochemical polymerization method. As doping agents were chose the substances capable to accept the electrons from π-conjugated chain – ferric chloride (FeCl₃) and complex K₃[Fe(CN)₆]. Doping process changes the structure of polyaminoarenes, but the effect largely depends on the type of polymer matrix and the mechanism of polymer-dopant interaction. In results of doping polyaminoarene films with ferrum contained compounds value of optical band gap is decreasing. An interaction of ferrum ions with macrochain of polyaminoarenes occurs by the mechanism of acceptor doping, where the ions Fe³⁺ serve as an acceptor and can oxidase the polymer chain. In the doping PoTI by complex K₃[Fe(CN)₆] the oxidative-reduced processes in polymer chain leading to some decrease of band gap energy.

摘要

研究了共轭聚氨基芳烃的掺杂对其在可见光和近红外光谱范围内的结构和光吸收的影响。采用电化学聚合法在透明氧化锡基底上制备了聚苯胺（PAN）、聚邻甲苯胺（PoTI）和聚邻茴香胺（PoA）薄膜。作为掺杂剂，选择了能够接受来自 π 共轭链电子的物质——氯化铁 (FeCl ₃ ) 和配合物 K ₃ [Fe(CN) ₆]。掺杂过程改变了聚氨基芳烃的结构，但其影响很大程度上取决于聚合物基体的类型和聚合物-掺杂剂相互作用的机制。在用含铁化合物掺杂聚氨基芳烃薄膜的结果中，光学带隙值正在降低。铁离子与聚氨基芳烃的大链相互作用通过受体掺杂机制发生，其中离子 Fe ³⁺作为受体并可以氧化聚合物链。在由复合物 K ₃ [Fe(CN) ₆ ]掺杂的 PoTI 中，聚合物链中的氧化还原过程导致带隙能量有所降低。