Self-Assembly Behavior of an Oligothiophene-Based Conjugated Liquid Crystal and Its Implication for Ionic Conductivity Characteristics

Liu, Ziwei; Dong, Ban Xuan; Misra, Mayank; Sun, Yangyang; Strzalka, Joseph; Patel, Shrayesh N.; Escobedo, Fernando A.; Nealey, Paul F.; Ober, Christopher K.

doi:10.1002/adfm.201805220

Title: Self-Assembly Behavior of an Oligothiophene-Based Conjugated Liquid Crystal and Its Implication for Ionic Conductivity Characteristics

Journal Article · 13 November 2018 · Advanced Functional Materials

DOI: https://doi.org/10.1002/adfm.201805220 · OSTI ID:1491829

Liu, Ziwei ^[1]; Dong, Ban Xuan ^[2]; Misra, Mayank ^[1]; Sun, Yangyang ^[1]; Strzalka, Joseph ^[3]; Patel, Shrayesh N. ^[4];

^[1]; Nealey, Paul F. ^[4];

^[1]

Cornell Univ., Ithaca, NY (United States)
Univ. of Chicago, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)

Here, a joint experimental and computational study on the synthesis, selfassembly and ionic conduction characteristics of a new conjugated liquid crystal quaterthiophene/poly(ethylene oxide) (PEO4) consisting of terminal tetraethyleneglycol monomethyl ether groups on both ends of a quaterthiophene core. In agreement with molecular dynamic simulations, temperature-dependent grazing-incidence wide angle X-ray scattering and X-ray diffraction indicate that the molecule spontaneously forms a smectic phase at ambient temperature as characterized both in bulk and thin film configurations. Significantly, this smectic phase is maintained upon blending with bis(trifluoro-methanesulfonyl)imide (LiTFSI) as ion source at a concentration ratio up to r = [Li⁺]/[EO] = 0.05. Nanosegregation between oligothiophene and PEO moieties and π-π stacking of thiophene rings led to the formation of efficient 2D pathways for ion transport, resulting in thin film in-plane ionic conductivity as high as 5.2 x 10^-4 S/cm^-1 at 70°C and r = 0.05 as measured by electrochemical impedance spectroscopy (EIS). Upon heating the samples above a transition temperature around 95 °C, a less ordered phase forms associated with a pronounced drop in ionic conductivity. Finally, upon cooling, partial and local reordering of the conducting smectic domains leads to an ionic conductivity decrease compared to the as-cast state.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1491829

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 2 Vol. 29; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
ionic conductivity
liquid crystal
oligothiophene
self-assembly
π-π interactions

Title: Self-Assembly Behavior of an Oligothiophene-Based Conjugated Liquid Crystal and Its Implication for Ionic Conductivity Characteristics

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