Ulgut Burak, Zhao Yu, Grose Jacob E, Ralph Daniel C, Abruña Héctor D
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
Langmuir. 2006 Apr 25;22(9):4433-7. doi: 10.1021/la053277r.
Self-assembled monolayers and bulk films of thioanilines, polymerized on gold and platinum surfaces, have been characterized and compared to bulk polyaniline (PANI) films. In a previous study [Kuwabata; et al. Langmuir 1999, 15, 6807-6812], only one redox couple was observed in the cyclic voltammetric profile of a polymerized monolayer of thioaniline on gold, in contrast to the known profiles of bulk PANI, which exhibit two couples. We observe two couples in both a polymerized thioaniline monolayer and a bulk polythioaniline (S-PANI) film, but the 200 mV window between the couples (the width of the region of high conductivity) in the S-PANI films is much smaller than the 600 mV window in bulk PANI. We ascribe this difference to the presence of the thiol substituent. The windows of high conductivity of the polymerized thioaniline monolayer and the bulk S-PANI film are the same within the limits of our experiment, implying that the difference in the dimensionality of the films (a 2D monolayer vs 3D bulk films) has a limited effect on the films' voltammetric profiles.
在金和铂表面聚合的硫代苯胺自组装单分子层和本体膜已被表征，并与本体聚苯胺（PANI）膜进行了比较。在先前的一项研究[Kuwabata等人，《朗缪尔》，1999年，第15卷，6807 - 6812页]中，与已知的本体聚苯胺的循环伏安曲线显示两个氧化还原对不同，在金表面硫代苯胺聚合单分子层的循环伏安曲线中仅观察到一个氧化还原对。我们在聚合硫代苯胺单分子层和本体聚硫代苯胺（S - PANI）膜中都观察到了两个氧化还原对，但S - PANI膜中两个氧化还原对之间的200 mV窗口（高电导率区域的宽度）比本体聚苯胺中的600 mV窗口小得多。我们将这种差异归因于硫醇取代基的存在。在我们的实验范围内，聚合硫代苯胺单分子层和本体S - PANI膜的高电导率窗口是相同的，这意味着膜的维度差异（二维单分子层与三维本体膜）对膜的伏安曲线影响有限。
