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Publication - Professor Charl FJ Faul

    Self-assembly of a functional oligo(aniline)-based amphiphile into helical conductive nanowires


    Bell, OA, Wu, G, Haataja, JS, Broemmel, F, Fey, N, Seddon, AM, Harniman, RL, Richardson, RM, Ikkala, O, Zhang, X & Faul, CFJ, 2015, ‘Self-assembly of a functional oligo(aniline)-based amphiphile into helical conductive nanowires’. Journal of the American Chemical Society, vol 137., pp. 14288?14294


    A tetra(aniline)-based cationic amphiphile, TANI-NHC(O)C5H10N(CH3)3+Br
    (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–vis 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’ 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–1. The conductivity, control over
    self-assembled 1D structure and water-solubility demonstrate these
    materials’ promise as processable and addressable functional materials
    for molecular electronics, redox-controlled materials and sensing.

    Full details in the University publications repository