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Issue 30, 2018
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Gating effects of conductive polymeric ionic liquids

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Poly(ionic liquid)s (POILs) belong to one of the most promising materials class in electrochemistry. In this study, we investigate POILs as a gating material within a field-effect transistor, additionally describing their glassy dynamics and charge transport properties. Four different imidazolium-based POILs have been investigated, ranging from homopolymers with varied counterions, i.e. POIL 1: P(APMIN(Tf)2) poly(1-[2-acryloylpropyl]-3-methylimidazolium bis(trifluoromethane)sulfonamide) and POIL 2: P(APMIPF6) poly(1-[2-acryloylpropyl]-3-methylimidazolium hexafluorophosphate, to semifluorinated random copolymers, i.e. POIL 3: P(APMIN(Tf)2-co-TFEA) (TFEA: 2,2,2-trifluoroethyl acrylate), and finally to semifluorinated triblock copolymers, POIL 4: P(APMIN(Tf)2-co-TFEA)-b-PPFS-b-P(APMIN(Tf)2-co-TFEA) (PPFS: polypentafluorostyrene). Their glassy dynamics and charge transport mechanism are investigated by broadband dielectric spectroscopy (BDS), differential scanning calorimetry (DSC) and alternating current chip-calorimetry (ACC). The gating effects of these POILs are studied in detail, showing for the first time a reversible phase transition between thin films formed from the brownmillertite phase SrCoO2.5 and the perovskite phase SrCoO3 by use of such POILs, being especially pronounced for POIL 1: P(APMIN(Tf)2) homopolymer displaying gate voltages (VG) of 3–4 V and a gating time of ∼4 h. In the case of the POIL 3, P(APMIN(Tf)2-co-TFEA) as a random copolymer, higher VG (−8/+5 V) and a longer gating time (∼16 h) are revealed. Phase transition between SrCoO2.5 and SrCoO3 could not be observed from POILs 2 & 4 even using very large gate voltages (−10/+8 V) for a much longer time (48 h), indicating that primarily charge density and charge-carrier mobility are decisive in ionic liquid gating.

Graphical abstract: Gating effects of conductive polymeric ionic liquids

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Supplementary files

Article information

23 Apr 2018
16 Jul 2018
First published
16 Jul 2018

J. Mater. Chem. C, 2018,6, 8242-8250
Article type

Gating effects of conductive polymeric ionic liquids

S. Chen, F. Frenzel, B. Cui, F. Gao, A. Campanella, A. Funtan, F. Kremer, S. S. P. Parkin and W. H. Binder, J. Mater. Chem. C, 2018, 6, 8242
DOI: 10.1039/C8TC01936C

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