Self-Assembly of a Functional Oligo(Aniline)-Based Amphiphile into Helical Conductive Nanowires
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- 作者：O. Alexander Bell ; Guanglu Wu ; Johannes S. Haataja ; Felicitas Br枚mmel ; Natalie Fey ; Annela M. Seddon ; Robert L. Harniman ; Robert M. Richardson ; Olli Ikkala ; Xi Zhang ; Charl F. J. Faul
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：November 18, 2015
- 年：2015
- 卷：137
- 期：45
- 页码：14288-14294
- 全文大小：548K
- ISSN：1520-5126
文摘
A tetra(aniline)-based cationic amphiphile, TANI-NHC(O)C5H10N(CH3)3+Br鈥?/sup> (TANI-PTAB) was synthesized, and its emeraldine base (EB) state was found to self-assemble into nanowires in aqueous solution. The observed self-assembly is described by an isodesmic model, as shown by temperature-dependent UV鈥搗is investigations. Linear dichroism (LD) studies, combined with computational modeling using time-dependent density functional theory (TD-DFT), suggests that TANI-PTAB molecules are ordered in an antiparallel arrangement within nanowires, with the long axis of TANI-PTAB arranged perpendicular to the nanowire long axis. Addition of either S- or R- camphorsulfonic acid (CSA) to TANI-PTAB converted TANI to the emeraldine salt (ES), which retained the ability to form nanowires. Acid doping of TANI-PTAB had a profound effect on the nanowire morphology, as the CSA counterions鈥?chirality translated into helical twisting of the nanowires, as observed by circular dichroism (CD). Finally, the electrical conductivity of CSA-doped helical nanowire thin films processed from aqueous solution was 2.7 mS cm鈥?. The conductivity, control over self-assembled 1D structure and water-solubility demonstrate these materials鈥?promise as processable and addressable functional materials for molecular electronics, redox-controlled materials and sensing.