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 · Wed Nov 14 00:00:00 EST 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)

Abstract In this work, a joint experimental and computational study on the synthesis, self‐assembly, 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 is performed. 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 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 lead to the formation of efficient 2D pathways for ion transport, resulting in thin‐film in‐plane ionic conductivity as high as 5.2 × 10 ⁻⁴ S cm ⁻¹ at 70 °C and r = 0.05 as measured by electrochemical impedance spectroscopy. Upon heating the samples above a transition temperature around 95 °C, an isotropic phase forms associated with a pronounced drop in ionic conductivity. 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:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; DE‐AC02‐06CH11357

OSTI ID:: 1491829

Alternate ID(s):: OSTI ID: 1482268

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

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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Preparation and Characterization of [pi]-Stacking Quinodimethane Oligothiophenes. Predicting Semiconductor Behavior and Bandwidths from Crystal Structures and Molecular Orbital Calculations

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Related Subjects

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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