Photoelectrochemistry and spectroscopy of substituted polyanilines
Photoelectrochemistry and spectroscopy of substituted polyanilines
复制标题
DOI：
10.1016/s0379-6779(99)00054-5
复制
发表时间：
1999-07-29
期刊：
影响因子：
4.4
通讯作者：
Wright, GA
中科院分区：
文献类型：
--
作者：
Kilmartin, PA;Wright, GA
用光电化学和光谱技术（拉曼和XPS）研究了四种取代聚苯胺（聚N-甲基苯胺、聚间甲基苯胺、聚邻甲氧基苯胺和聚邻乙氧基苯胺）的性质。聚（N-甲基苯胺）的循环伏安图中的中间峰归因于水解产物，如苯醌，在聚（邻甲氧基苯胺）的情况下，支链形式。取代的聚苯胺的光电流分布类似于聚苯胺在很大程度上，与延长的阴极和阳极的光电流给出的聚合物在高导电性的状态。与聚（邻乙氧基苯胺），只有短寿命的光电流，得到指向一个更高的绝缘材料，也显示了这种聚合物的有限增长。原位得到的取代聚苯胺的拉曼光谱显示出典型的聚苯胺拉曼谱带，而聚（N-甲基苯胺）的nu（CN）谱带的最大位移（35 cm（-1））。XPS扫描中的N Is信号的去卷积显示与聚合物的氧化形式一致的氮：高比例的带正电荷的氮用于聚（N-甲基苯胺）和亚胺氮用于聚（间甲基苯胺）。(C)1999年Elsevier Science S.A. All rights reserved.
The properties of four substituted polyanilines, poly(N-methylaniline), poly(m-methylaniline), poly(o-methoxyaniline), and poly(o-ethoxyaniline) have been examined by photoelectrochemical and spectroscopic techniques (Raman and XPS). The middle peak in cyclic voltammograms for poly(N-methylaniline) was ascribed to hydrolysis products such as benzoquinone, and in the case of poly(o-methoxyaniline) to branched forms. The photocurrent profiles of the substituted polyanilines resembled those of polyaniline to a large extent, with prolonged cathodic and anodic photocurrents given for the polymer in a state of high conductivity. With poly(o-ethoxyaniline) only short-lived photocurrents were obtained pointing to a more highly insulating material, also shown by the limited growth of this polymer. Raman spectra of the substituted polyanilines taken in situ revealed typical polyaniline Raman bands, while the largest shift in the nu(CN) band (35 cm(-1)) occurred with poly(N-methylaniline). A deconvolution of the N Is signal in XPS scans showed nitrogens consistent with oxidised forms of the polymers: a high proportion of positively charged nitrogens for poly(N-methylaniline) and of imine nitrogens for poly(m-methylaniline). (C) 1999 Elsevier Science S.A. All rights reserved.