Nanostructured conducting polypyrrole and poly(N-methylpyrrole) were successfully synthesized by simply adding monomers into a magnetic ionic liquid, bmim[FeCl4]. In this process, self-organized conducting polymer nanostructures such as particles and tubes were formed without and with magnetic field. The shape of polypyrrole nanoparticles synthesized at room temperature was almost spherical with their size ranging around 60 nm with a relatively narrow size distribution. The conductivity of pelletized particles was 101−2 S/cm. From the N-methylpyrrole monomer, more attractive nanostructured polymers were obtained. Tubes with nanoscaled inner holes and walls were synthesized using a self-assembly process for the first time. The self-assembled local structures in the solvent ionic liquid are likely to serve as templates of highly organized nanostructured polymers. External magnetic field seems to affect these local structures and hence the resultant polymer nanostructures. This research provides a new method to synthesize various nanosized conducting polymeric materials via simple self-assembly.
Flexible all-organic polymer-dispersed liquid crystal (PDLC) devices were fabricated by using highly transparent and conductive poly(3,4-ethylenedioxy thiophene): p-toluene sulfonate (PEDOT:PTS) films, as electrode layers. These conductive PEDOT:PTS films have a high transparency up to 80%, and possess a very low sheet resistance of 100Ωsq−1 at 100nm thickness. We report on the fabrication and characterization of a PDLC device using a highly conductive PEDOT:PTS for the electrodes and demonstrate its superior performance relative to that of a similar device using the indium tin oxide layer as the electrodes.
Organic semiconducting polymer thin-films of 3-hexylthiophene, 3-octylthiophene, 3-decylthiophene, containing highly oriented crystal were fabricated by gas-phase polymerization using the CVD technique. These poly(3-alkylthiophene) films had a crystallinity up to 80%, and possessed a Hall mobility up to 10 cm2/Vs. The degree of crystalinity and the mobility values increased as the alkyl chain length increased. The crystal structure of the polymers was composed of stacked layers constructed by a side-by-side arrangement of alkyl chains and in-plane pi-pi stacking. These thin films are capable of being applied to organic electronics as the active materials used in thin-film transistors and organic photovoltaic cells.
Flexible OELDs were fabricated by using highly conductive poly(3,4‐ethylenedioxy thiophene): p‐toluene sulfonate(PEDOT: PTS) nano‐films, as electrode layers. These conductive PEDOT: PTS films have a high transparency up to 80%, and possess a very low sheet resistance of 100 Ω square−1 at 160‐nm thickness. We report on the fabrication and characterization of a OELD using a PEDOT: PTS for the electrodes and demonstrate its superior performance relative to that of a similar device using the a‐ITO layer. The device has been demonstrated to exhibit light emission in green, brightness level up to 1800 cd/m2 at the 25 V.
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