Anisotropic ionic conductivity in fluorinated ionic liquid crystals suitable for optoelectronic applications

Antonio Abate*, Annamaria Petrozza, Gabriella Cavallo, Guglielmo Lanzani, Francesco Matteucci, Duncan W. Bruce, Nikolay Houbenov, Pierangelo Metrangolo, Giuseppe Resnati

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

53 Citations (Scopus)

Abstract

In this work, we report a library of thirteen fluorinated ionic liquids consisting of iodide salts of 1-alkyl-3-polyfluoroalkyl-imidazolium cations. By changing the length of the alkyl and polyfluoroalkyl pendants, we discovered that particular combinations of these result in compounds showing a mesophase. The nature and the molecular arrangement of the mesophase are characterised by polarised optical microscopy and powder X-ray diffraction analysis, among others. We demonstrate that, after the addition of I2 to generate the I-/I3 - redox couple, anisotropic ionic conductivity takes place along preferential pathways in the lamellar structure of the mesophase. Notably, the addition of I2 does not suppress the mesophase temperature range, contrary to previously reported systems. Furthermore, the tendency of these materials to supercool allows the molecular arrangement in the mesophase to be retained in a solid film at ambient temperatures. Finally, we demonstrate their applicability as a quasi-solid electrolyte by preparing dye-sensitised solar cells with power conversion efficiencies comparable to the previous reports.

Original languageEnglish
Pages (from-to)6572-6578
Number of pages7
JournalJOURNAL OF MATERIALS CHEMISTRY. A
Volume1
Issue number22
DOIs
Publication statusPublished - 14 Jun 2013
MoE publication typeA1 Journal article-refereed

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    Abate, A., Petrozza, A., Cavallo, G., Lanzani, G., Matteucci, F., Bruce, D. W., Houbenov, N., Metrangolo, P., & Resnati, G. (2013). Anisotropic ionic conductivity in fluorinated ionic liquid crystals suitable for optoelectronic applications. JOURNAL OF MATERIALS CHEMISTRY. A, 1(22), 6572-6578. https://doi.org/10.1039/c3ta10990a