Gating effects of conductive polymeric ionic liquids
| Autor: | Bin Cui, Antonella Campanella, Fang Gao, Stuart S. P. Parkin, Wolfgang H. Binder, Falk Frenzel, Senbin Chen, Friedrich Kremer, Alexander Funtan |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Analytical chemistry Charge density 02 engineering and technology General Chemistry Gating 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Differential scanning calorimetry chemistry Hexafluorophosphate Phase (matter) Ionic liquid Materials Chemistry Counterion 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of Materials Chemistry C |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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