Aoki Atsushi, Umehara Ryota, Banba Koji
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-Chou, Shouwa-ku, Nagoya 466-8555, Japan.
Langmuir. 2009 Jan 20;25(2):1169-74. doi: 10.1021/la803061e.
Organic-solvent-soluble amphiphilic polyanilne was prepared by ion complex formation of protonated polyaniline (PANI) and anionic surfactant dodecylbenzenesulfonic acid (DBSA). The amphiphilic PANI/DBSA ion complex shows stable monolayer behavior at the air-water interface and formation of LB films on solid substrates. The cyclic voltammograms for the monolayer PANI/DBSA LB films show two distinct redox process waves, that is, the quasi-reversible redox wave at around 0.05 V vs SCE as a lucoemeralidine/emeraldine couple and the symmetric surface wave behavior of PANI at 0.75 V vs SCE as an emeraldine/pernigraniline couple. The surface morphology of the monolayer PANI/DBSA LB film on a Si wafer shows that monolayer surface roughness is smooth at a molecular level with fiberlike bundle structures where the elongated main chains of polyanilines were assembled by pi-pi interaction of the polyanilines. Conductivity of PANI/DBSA LB films depends on the number of layers at less than four layers, and it becomes similar to the bulk conductivity, 0.5 S/cm, at more than four layers.
通过质子化聚苯胺（PANI）与阴离子表面活性剂十二烷基苯磺酸（DBSA）形成离子络合物，制备了有机溶剂可溶性两亲性聚苯胺。两亲性聚苯胺/ DBSA离子络合物在气-水界面表现出稳定的单分子层行为，并在固体基质上形成LB膜。单层聚苯胺/ DBSA LB膜的循环伏安图显示出两个不同的氧化还原过程波，即相对于饱和甘汞电极（SCE）在约0.05 V处作为鲁醌二亚胺/翠绿亚胺对的准可逆氧化还原波，以及相对于SCE在0.75 V处作为翠绿亚胺/全醌式亚胺对的聚苯胺对称表面波行为。硅片上单层聚苯胺/ DBSA LB膜的表面形态表明，在分子水平上单层表面粗糙度是光滑的，具有纤维状束状结构，其中聚苯胺的伸长主链通过聚苯胺的π-π相互作用组装。聚苯胺/ DBSA LB膜的电导率在小于四层时取决于层数，在超过四层时变得类似于本体电导率0.5 S/cm。
