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Träfflista för sökning "WAKA:ref ;pers:(Inganäs Olle);pers:(Herland Anna)"

Sökning: WAKA:ref > Inganäs Olle > Herland Anna

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1.
  • Andersson, Viktor, et al. (författare)
  • Imaging of the 3D Nanostructure of a Polymer Solar Cell by Electron Tomography
  • 2009
  • Ingår i: Nano letters (Print). - 1530-6984. ; 9:2, s. 853-855
  • Tidskriftsartikel (refereegranskat)abstract
    • Electron tomography has been used for analyzing the active layer in a polymer solar cell, a bulk heterojunction of an alternating copolymer of fluorene and a derivative of fullerene. The method supplies a three-dimensional representation of the morphology of the film, where domains with different scattering properties may be distinguished. The reconstruction shows good contrast between the two phases included in the film and demonstrates that electron tomography is an adequate tool for investigations of the three-dimensional nanostructure of the amorphous materials used in polymer solar cells.
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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.
  • Björk, Per, et al. (författare)
  • Single molecular imaging and spectroscopy of conjugated polyelectrolytes decorated on stretched aligned DNA
  • 2005
  • Ingår i: Nano Letters. - 1530-6984 (print), 1530-6992 (online). ; 5:10, s. 1948-1953
  • Tidskriftsartikel (refereegranskat)abstract
    • DNA is the prototype template for building nanoelectronic devices by self-assembly. The electronic functions are made possible by coordinating electronic polymer chains to DNA. This paper demonstrates two methods for fabrication of aligned and ordered DNA nanowires complexed with conjugated polyelectrolytes (CPEs). The complex can be formed either in solution prior to stretching or after stretching of the bare DNA on a surface. Molecular combing was used to stretch the complexes on surface energy patterned surfaces, and PMMA for the bare DNA. Single molecular spectroscopy, in fluorescence, and microscopy, in atomic force microscopy, give evidence for coordination of the short CPE chains to the aligned DNA.
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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.
  • Herland, Anna, et al. (författare)
  • Alignment of a conjugated polymer onto amyloid-like protein fibrils
  • 2007
  • Ingår i: Small. - 1613-6810. ; 3:2, s. 318-325
  • Tidskriftsartikel (refereegranskat)abstract
    • The amyloid-like fibril is a biomolecular nanowire template of very high stability. Here we describe the coordination of a conjugated polyelectrolyte, poly(thiophene acetic acid) (PTAA), to bovine insulin fibrils with widths of &lt;10 nm and lengths of up to more than 10 <img src="http://www3.interscience.wiley.com/giflibrary/12/mu.gif" />m. Fibrils complexed with PTAA are aligned on surfaces through molecular combing and transfer printing. Single-molecule spectroscopy techniques are applied to chart spectral variation in the emission of these wires. When these results are combined with analysis of the polarization of the emitted light, we can conclude that the polymer chains are preferentially aligned along the fibrillar axis.
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6.
  • Herland, Anna, 1979-, et al. (författare)
  • Conjugated polymers as optical probes for protein interactions and protein conformations
  • 2007
  • Ingår i: Macromolecular rapid communications. - 1022-1336. ; 28:17, s. 1703-1713
  • Tidskriftsartikel (refereegranskat)abstract
    • There is a need for highly sensitive, multi-parallel protein sensors within diagnostics and proteomic research. Conjugated polymers (CPs) have been demonstrated as highly sensitive optical probes for protein biosensing. Compared to small molecules, the polymeric probe has the possibility of multiple interactions and a collective response, which enhances the sensor signal. The optical output is colorimetric or, more sensitive, fluorescence based, including Förster energy transfer and changes in the emission wavelengths and/or intensity. Using CPs, many interesting protein detection events have been demonstrated, e.g., protein interactions, enzymatic activity, amyloid fibril formation, and detection by aptamers. CPs have also been successfully used to stain bacterial, cellular, and tissue samples. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.
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7.
  • Herland, Anna, et al. (författare)
  • Decoration of amyloid fibrils with luminescent conjugated polymers
  • 2008
  • Ingår i: Journal of Materials Chemistry. - 0959-9428. ; 18:1, s. 126-132
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work we report the coating of a biological template with a polar, but uncharged, luminescent conjugated polymer, soluble in organic solvents but not in water, to produce a nanowire. Amyloid fibrils from bovine insulin were decorated with an alternating polyfluorene derivative. Decorated fibrils were partially aligned on hydrophobic surfaces as separate and bundled fibrils, by means of molecular combing. The single molecule spectroscopy technique utilizing excitation by rotating linearly polarized light and fluorescence detection through a rotating polarizer showed a high degree of anisotropy of the polymer chains on the individual fibrils. The high degree of polarization indicated highly oriented polymer chains with the preferential orientation of the polymer backbone along the fibrils. The anisotropy ratios are comparable with those of well-oriented polymer chains in films. © The Royal Society of Chemistry.
8.
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9.
  • Herland, Anna, et al. (författare)
  • Synthesis of a regioregular zwitterionic conjugated oligoelectrolyte, usable as an optical probe for detection of amyloid fibril formation at acidic pH
  • 2005
  • Ingår i: Journal of the American Chemical Society. - 0002-7863. ; 127:7, s. 2317-2323
  • Tidskriftsartikel (refereegranskat)abstract
    • Changes of the optical properties of conjugated polyelectrolytes have been utilized to monitor noncovalent interactions between biomolecules and the conjugated polyelectrolytes in sensor applications. A regioregular, zwitterionic conjugated oligoelectrolyte was synthesized in order to create a probe with a defined set of optical properties and hereby facilitate interpretation of biomolecule−oligoelectrolyte interactions. The synthesized oligoelectrolyte was used at acidic pH as a novel optical probe to detect amyloid fibril formation of bovine insulin and chicken lysozyme. Interaction of the probe with formed amyloid fibrils results in changes of the geometry and the electronic structure of the oligoelectrolyte chains, which were monitored with absorption and emission spectroscopy.
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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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