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Sökning: WAKA:ref > Inganäs Olle > Kungliga Tekniska Högskolan > Refereegranskat

  • Resultat 1-10 av 18
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  • Asplund, M, et al. (författare)
  • Composite biomolecule/PEDOT materials for neural electrodes
  • 2008
  • Ingår i: Biointerphases. - NY : American Institute of Physics. - 1559-4106. ; 3:3, s. 83-93
  • Tidskriftsartikel (refereegranskat)abstract
    • Electrodes intended for neural communication must be designed to meet boththe electrochemical and biological requirements essential for long term functionality. Metallic electrode materials have been found inadequate to meet theserequirements and therefore conducting polymers for neural electrodes have emergedas a field of interest. One clear advantage with polymerelectrodes is the possibility to tailor the material to haveoptimal biomechanical and chemical properties for certain applications. To identifyand evaluate new materials for neural communication electrodes, three chargedbiomolecules, fibrinogen, hyaluronic acid (HA), and heparin are used ascounterions in the electrochemical polymerization of poly(3,4-ethylenedioxythiophene) (PEDOT). The resultingmaterial is evaluated electrochemically and the amount of exposed biomoleculeon the surface is quantified. PEDOT:biomolecule surfaces are also studiedwith static contact angle measurements as well as scanning electronmicroscopy and compared to surfaces of PEDOT electrochemically deposited withsurfactant counterion polystyrene sulphonate (PSS). Electrochemical measurements show that PEDOT:heparinand PEDOT:HA, both have the electrochemical properties required for neuralelectrodes, and PEDOT:heparin also compares well to PEDOT:PSS. PEDOT:fibrinogen isfound less suitable as neural electrode material.
  • 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.
  • Borgani, Riccardo, et al. (författare)
  • Intermodulation electrostatic force microscopy for imaging surface photo-voltage
  • 2014
  • Ingår i: Applied Physics Letters. - American Institute of Physics (AIP). - 0003-6951. ; 105:14, s. 143113
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate an alternative to Kelvin Probe Force Microscopy for imaging surface potential. The open-loop, single-pass technique applies a low-frequency AC voltage to the atomic force microscopy tip while driving the cantilever near its resonance frequency. Frequency mixing due to the nonlinear capacitance gives intermodulation products of the two drive frequencies near the cantilever resonance, where they are measured with high signal to noise ratio. Analysis of this intermodulation response allows for quantitative reconstruction of the contact potential difference. We derive the theory of the method, validate it with numerical simulation and a control experiment, and we demonstrate its utility for fast imaging of the surface photo-voltage on an organic photovoltaic material.
  • 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.
  • 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.
  • Hamedi, Mahiar, et al. (författare)
  • Electronic Polymers and DNA Self-assembled in Nanowire Transistors
  • 2013
  • Ingår i: Small. - Wiley-VCH Verlag Berlin. - 1613-6810. ; 9:3, s. 363-368
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study the fully acidic form of PEDOT-S was used for the purpose of self-assembly onto DNA. We have previously shown that PEDOT-S is a short polymer that is self-doped with !1/3 of the sulfonate side groups acting as the self-doping sites (see supporting info.). The remaining sulfonate groups contribute to a net anionic charge, and a water-soluble polymer, with an intrinsic bulk conductivity of around 30 S/cm. It has been shown that PEDOT-S can bind to oppositely charged cationic amyloid protein structures in water and form conducting nano fibrillar networks, and it has also been shown to form hybrid structures with synthetic peptides, and gold nanoparticles.
  • 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.
  • 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.
  • Hevekerl, Heike, 1982-, et al. (författare)
  • Dark States in Ionic Oligothiophene Bioprobes-Evidence from Fluorescence Correlation Spectroscopy and Dynamic Light Scattering
  • 2014
  • Ingår i: Journal of Physical Chemistry B. - American Chemical Society. - 1520-6106. ; 118:22, s. 5924-5933
  • Tidskriftsartikel (refereegranskat)abstract
    • Luminescent conjugated polyelectrolytes (LCPs) can upon interaction with biological macromolecules change their luminescent properties, and thereby serve as conformation- and interaction-sensitive biomolecular probes. However, to exploit this in a more quantitative manner, there is a need to better understand the photophysical processes involved. We report studies of the conjugated pentameric oligothiophene, derivative p-FTAA, which changes optical properties with different p-FTAA concentrations in aqueous buffers, and in a pH and oxygen saturation dependent manner. Using dynamic light scattering, luminescence spectroscopy and fluorescence correlation spectroscopy, we find evidence for a monomer dimer equilibrium, for the formation of large clusters of p-FTAA in aqueous environment, and can couple aggregation to changed emission properties of oligothiophenes. In addition, we observe the presence of at least two dark transient states, one presumably being a triplet state. Oxygen was found to statically quench the p-FTAA fluorescence but also to promote molecular fluorescence by quenching dark transient states of the p-FTAA molecules. Taken together, this study provides knowledge of fluorescence and photophysical features essential for applying p-FTAA and other oligothiophene derivatives for diagnostic purposes, including detection and staining of amyloid aggregates.
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