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Träfflista för sökning "WAKA:ref ;pers:(Inganäs Olle);pers:(Hamedi Mahiar)"

Sökning: WAKA:ref > Inganäs Olle > Hamedi Mahiar

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2.
  • Björk, Per, et al. (författare)
  • Biomolecular nanowires decorated by organic electronic polymers
  • 2010
  • Ingår i: JOURNAL OF MATERIALS CHEMISTRY. - 0959-9428. ; 20:12, s. 2269-2276
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate the shaping and forming of organic electronic polymers into designer nanostructures using biomacromolecules. In order to create nanowires, nanohelixes and assemblies of these, we coordinate semiconducting or metallic polymers to biomolecular polymers in the form of DNA and misfolded proteins. Optoelectronic and electrochemical devices utilizing these shaped materials are discussed.
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3.
  • Hamedi, Mahiar, et al. (författare)
  • Bridging Dimensions in Organic Electronics : Assembly of Electroactive Polymer Nanodevices from Fluids
  • 2009
  • Ingår i: Nano letters (Print). - 1530-6984. ; 9:2, s. 631-635
  • Tidskriftsartikel (refereegranskat)abstract
    • Processing and patterning of electroactive materials from solvents is a hallmark of flexible organic electronics,(1) and commercial applications based on these properties are now emerging. Printing and ink-jetting are today preferred technologies for patterning, but these limit the formation of nanodevices, as they give structures way above the micrometer lateral dimension. There is therefore a great need for cheap, large area patterning of nanodevices and methods for top-down registration of these. Here we demonstrate large area patterning of connected micro/nanolines and nanotransistors from the conducting polymer PEDOT, assembled from fluids. We thereby simultaneously solve problems of large area nanopatterning, and nanoregistration.
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4.
  • Hamedi, Mahiar, et al. (författare)
  • Electrochemical Devices Made from Conducting Nanowire Networks Self-Assembled from Amyloid Fibrils and Alkoxysulfonate PEDOT
  • 2008
  • Ingår i: Nano letters (Print). - 1530-6984. ; 8:6, s. 1736-1740
  • Tidskriftsartikel (refereegranskat)abstract
    • Proteins offer an almost infinite number of functions and geometries for building nanostructures. Here we have focused on amyloid fibrillar proteins as a nanowire template and shown that these fibrils can be coated with the highly conducting polymer alkoxysulfonate PEDOT through molecular self-assembly in water. Transmission electron microscopy and atomic force microscopy show that the coated fibers have a diameter around 15 nm and a length/thickness aspect ratio >1:1000 . We have further shown that networks of the conducting nanowires are electrically and electrochemically active by constructing fully functional electrochemical transistors with nanowire networks, operating at low voltages between 0 and 0.5 V.
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5.
  • Hamedi, Mahiar, et al. (författare)
  • Fiber-Embedded Electrolyte-Gated Field-Effect Transistors for e-Textiles
  • 2009
  • Ingår i: Advanced Materials. - 0935-9648. ; 21:5, s. 573-577
  • Tidskriftsartikel (refereegranskat)abstract
    • Electrolyte-gate organic field-effect transistors embedded at the junction of textile microfibers are demonstrated. The fiber transistor operates below I V and delivers large current densities. The transience of the organic thin-film transistors current and the impedance spectroscopy measurements reveal that the channel is formed in two steps.
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6.
  • Hamedi, Mahiar, et al. (författare)
  • Towards woven logic from organic electronic fibres
  • 2007
  • Ingår i: Nature Materials. - 1476-1122. ; 6, s. 357-362
  • Tidskriftsartikel (refereegranskat)abstract
    • The use of organic polymers for electronic functions is mainly motivated by the low-end applications, where low cost rather than advanced performance is a driving force. Materials and processing methods must allow for cheap production. Printing of electronics using inkjets1 or classical printing methods has considerable potential to deliver this. Another technology that has been around for millennia is weaving using fibres. Integration of electronic functions within fabrics, with production methods fully compatible with textiles, is therefore of current interest, to enhance performance and extend functions of textiles2. Standard polymer field-effect transistors require well defined insulator thickness and high voltage3, so they have limited suitability for electronic textiles. Here we report a novel approach through the construction of wire electrochemical transistor (WECT) devices, and show that textile monofilaments with 10–100 µm diameters can be coated with continuous thin films of the conducting polythiophene poly(3,4-ethylenedioxythiophene), and used to create micro-scale WECTs on single fibres. We also demonstrate inverters and multiplexers for digital logic. This opens an avenue for three-dimensional polymer micro-electronics, where large-scale circuits can be designed and integrated directly into the three-dimensional structure of woven fibres.
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8.
  • Johansson, Janne, et al. (författare)
  • Functionalisation of recombinant spider silk with conjugated polyelectrolytes
  • 2011
  • Ingår i: Journal of Materials Chemistry. - Royal Society of Chemistry. - 0959-9428. ; 21:9, s. 2909-2915
  • Tidskriftsartikel (refereegranskat)abstract
    • Conjugated polyelectrolytes are demonstrated to permit facile staining of recombinant spider silk fibres. We find that the polyelectrolyte concentration and pH of the staining solution as well as the incubation temperature strongly influence the efficiency of this self-assembly process, which appears to be principally mediated through favourable electrostatic interactions. Thus, depending on the choice of staining conditions as well as the polyelectrolyte, electrically conductive or photoluminescent recombinant silk fibres could be produced. In addition, staining of natural Bombyx mori silk is established, which emphasises the versatility of the here advanced approach to functionalise silk-based materials.
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10.
  • Karlsson, Roger, et al. (författare)
  • Iron-Catalyzed Polymerization of Alkoxysulfonate-Functionalized 3,4-Ethylenedioxythiophene Gives Water-Soluble Poly(3,4-ethylenedioxythiophene) of High Conductivity
  • 2009
  • Ingår i: Chemistry of Materials. - American Chemical Society (ACS). - 0897-4756. ; 21:9, s. 1815-1821
  • Tidskriftsartikel (refereegranskat)abstract
    • Chemical polymerization of a 3,4-ethylenedioxythiophene derivative bearing a sulfonate group (EDOTS) is reported. The polymer, PEDOT-S, is fully water-soluble and has been produced by polymerizing EDOT-S in water, using Na2S2O8 and a catalytic amount of FeCl3. Elemental analysis and XPS measurements indicate that PEDOT-S is a material with a substantial degree of self-doping, but also contains free sulfate ions as charge-balancing counterions of the oxidized polymer. Apart from self-doping PEDOT-S, the side chains enable full water solubility of the material; DLS studies show an average cluster size of only 2 nm. Importantly, the solvation properties of the PEDOT-S are reflected in spin-coated films, which show a surface roughness of 1.2 nm and good conductivity (12 S/cm) in ambient conditions. The electro-optical properties of this material are shown with cyclic voltammetry and spectroelectrochemical experiment reveals an electrochromic contrast (similar to 48% at lambda(max) = 606 nm).
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