Efremova Aleksandra O, Tolstopjatova Elena G, Holze Rudolf, Kondratiev Veniamin V
Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya Nab., 199034 Saint Petersburg, Russia.
Institute of Chemistry, AG Elektrochemie, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
Polymers (Basel). 2021 May 18;13(10):1630. doi: 10.3390/polym13101630.
Cyclic voltammograms and optical absorption spectra of PEDOT/WO composite films were recorded in order to identify possible interactions and modes of improved performance of the composite as compared to the single materials. Changes in the shape of redox peaks related to the W(VI)/W(V) couple in the CVs of WO and the composite PEDOT/WO films indicate electrostatic interactions between the negatively charged tungsten oxide species and the positively charged conducting polymer. Smaller peak separation suggests a more reversible redox process due to the presence of the conducting polymer matrix, accelerating electron transfer between tungsten ions. Electronic absorption spectra of the materials were analyzed with respect to changes of the shapes of the spectra and characteristic band positions. There are no noticeable changes in the position of the electronic absorption bands of the main chromophores in the electronic spectra of the composite film. Obviously, the interactions accelerating the redox performance do not show up in the optical spectra. This suggests that the existing electrostatic interactions in the composite do not significantly change the opto-electronic properties of components of the composite but resulted in the redistribution of fractions of polaron and bipolaron forms in the polymer.
记录了PEDOT/WO复合薄膜的循环伏安图和光吸收光谱，以确定与单一材料相比，复合材料可能存在的相互作用和性能改善模式。与WO以及复合PEDOT/WO薄膜的循环伏安图中W(VI)/W(V)电对相关的氧化还原峰形状的变化表明，带负电荷的氧化钨物种与带正电荷的导电聚合物之间存在静电相互作用。较小的峰间距表明，由于导电聚合物基质的存在，氧化还原过程更具可逆性，加速了钨离子之间的电子转移。根据光谱形状和特征带位置的变化对材料的电子吸收光谱进行了分析。复合薄膜电子光谱中主要发色团的电子吸收带位置没有明显变化。显然，加速氧化还原性能的相互作用在光谱中并未显现出来。这表明复合材料中现有的静电相互作用并没有显著改变复合材料各组分的光电性能，而是导致了聚合物中极化子和双极化子形式分数的重新分布。
