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Hamedi, Mahiar
Publications (10 of 16) Show all publications
Hamedi, M., Elfwing, A., Gabrielsson, R. H. & Inganäs, O. (2013). Electronic Polymers and DNA Self-assembled in Nanowire Transistors. Small, 9(3), 363-368
Open this publication in new window or tab >>Electronic Polymers and DNA Self-assembled in Nanowire Transistors
2013 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 9, no 3, p. 363-368Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Wiley-VCH Verlag Berlin, 2013
Keywords
Organic electronics, conducting polymers, DNA nanotechnology, molecular selfassembly, organic electrochemical transistors
National Category
Natural Sciences Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-81344 (URN)10.1002/smll.201201771 (DOI)000314547200005 ()
Note

Funding Agencies|Strategic Research Foundation SSF through the program OPEN||

Available from: 2012-09-12 Created: 2012-09-12 Last updated: 2017-12-07Bibliographically approved
Müller, C., Jansson, R., Elfwing, A., Askarieh, G., Karlsson, R., Hamedi, M., . . . Hedhammar, M. (2011). Functionalisation of recombinant spider silk with conjugated polyelectrolytes. Journal of Materials Chemistry, 21(9), 2909-2915
Open this publication in new window or tab >>Functionalisation of recombinant spider silk with conjugated polyelectrolytes
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2011 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 21, no 9, p. 2909-2915Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-66131 (URN)10.1039/c0jm03270k (DOI)000287369300019 ()
Available from: 2011-03-04 Created: 2011-03-04 Last updated: 2017-12-11
Müller, C., Hamedi, M., Karlsson, R., Jansson, R., Marcilla, R., Hedhammar, M. & Inganäs, O. (2011). Woven Electrochemical Transistors on Silk Fibers. ADVANCED MATERIALS, 23(7), 898
Open this publication in new window or tab >>Woven Electrochemical Transistors on Silk Fibers
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2011 (English)In: ADVANCED MATERIALS, ISSN 0935-9648, Vol. 23, no 7, p. 898-Article in journal (Refereed) Published
Abstract [en]

Woven electrochemical transistors on silk fibers from the silkworm Bombyx mori are demonstrated. This is achieved with carefully chosen electrolyte chemistry: electrically conducting silk fibers are produced by dyeing silk fibers with a conjugated polyelectrolyte and gating is accomplished by use of an electrolyte mixture composed of imidazolium-based ionic liquids.

Place, publisher, year, edition, pages
John Wiley and Sons, Ltd, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-66903 (URN)10.1002/adma.201003601 (DOI)000287668500015 ()
Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2015-05-29
Björk, P., Herland, A., Hamedi, M. & Inganäs, O. (2010). Biomolecular nanowires decorated by organic electronic polymers. JOURNAL OF MATERIALS CHEMISTRY, 20(12), 2269-2276
Open this publication in new window or tab >>Biomolecular nanowires decorated by organic electronic polymers
2010 (English)In: JOURNAL OF MATERIALS CHEMISTRY, ISSN 0959-9428, Vol. 20, no 12, p. 2269-2276Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-54609 (URN)10.1039/b910639a (DOI)000275380000001 ()
Available from: 2010-03-26 Created: 2010-03-26 Last updated: 2010-03-26
Hamedi, M., Wigenius, J., Tai, F.-i., Björk, P. & Aili, D. (2010). Polypeptide-guided assembly of conducting polymer nanocomposites. NANOSCALE, 2(10), 2058-2061
Open this publication in new window or tab >>Polypeptide-guided assembly of conducting polymer nanocomposites
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2010 (English)In: NANOSCALE, ISSN 2040-3364, Vol. 2, no 10, p. 2058-2061Article in journal (Refereed) Published
Abstract [en]

A strategy for fabrication of electroactive nanocomposites with nanoscale organization, based on self-assembly, is reported. Gold nanoparticles are assembled by a polypeptide folding-dependent bridging. The polypeptides are further utilized to recruit and associate with a water soluble conducting polymer. The polymer is homogenously incorporated into the nanocomposite, forming conducting pathways which make the composite material highly conducting.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2010
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-61181 (URN)10.1039/c0nr00299b (DOI)000282686200019 ()
Note
Original Publication: Mahiar Hamedi, Jens Wigenius, Feng-i Tai, Per Björk and Daniel Aili, Polypeptide-guided assembly of conducting polymer nanocomposites, 2010, NANOSCALE, (2), 10, 2058-2061. http://dx.doi.org/10.1039/c0nr00299b Copyright: Royal Society of Chemistry http://www.rsc.org/ Available from: 2010-11-05 Created: 2010-11-05 Last updated: 2014-10-08Bibliographically approved
Wigenius, J., Björk, P., Hamedi, M. & Aili, D. (2010). Supramolecular Assembly of Designed α-Helical Polypeptide-Based Nanostructures and Luminescent Conjugated Polyelectrolytes. Macromolecular Bioscience, 10(8), 836-841
Open this publication in new window or tab >>Supramolecular Assembly of Designed α-Helical Polypeptide-Based Nanostructures and Luminescent Conjugated Polyelectrolytes
2010 (English)In: Macromolecular Bioscience, ISSN 1616-5187, E-ISSN 1616-5195, Vol. 10, no 8, p. 836-841Article in journal (Refereed) Published
Abstract [en]

Designed polypeptides with controllable folding properties are utilized as supramolecular templates for fabrication of ordered nanoscale molecular and fibrous assemblies of luminescent conjugated polymers (LCPs). The properties of the LCPs as well as the three dimensional conformation of the polypeptide-scaffold determine how the polymers are arranged in the supramolecular construct, which highly affects the properties of the hybrid material. The ability to control the polypeptide conformation and assembly into fibers provide a promising route for tuning the optical properties of LCPs and for fabrication of complex functional supramolecules with well defined structural properties.

Place, publisher, year, edition, pages
John Wiley & Sons, 2010
Keywords
α-helical; conjugated polymers; hybrid materials; peptides; self-assembly
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-54899 (URN)10.1002/mabi.200900463 (DOI)000281387900002 ()
Available from: 2010-04-20 Created: 2010-04-20 Last updated: 2017-12-12Bibliographically approved
Hamedi, M., Wigenius, J., Tai, F.-I., Björk, P. & Aili, D. (2010). Synthetic Polypeptides as Scaffolds for Supramolecular Assembly of Conducting Polymer Nanocomposites.
Open this publication in new window or tab >>Synthetic Polypeptides as Scaffolds for Supramolecular Assembly of Conducting Polymer Nanocomposites
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2010 (English)Manuscript (preprint) (Other academic)
Abstract [en]

The development of nanoelectronics has resulted in enormous advancements in fabrication techniques that have enabled massproduction of CMOS circuits with feature sizes below 45nm. There is a large interest in new methods to further push the size limits, lower the production costs and to facilitate the design of more advanced three-dimensional structures beyond today’s 2.5 dimensional architectures. Self-assembly is probably the most important scheme in this development and is currently applied to many different areas and classes of nanoelectronics. Self-assembly enables fabrication of structures well below 10 nm in feature size and allows for incorporation of novel nanomaterials, such as metallic and semiconducting nanoparticles with many interesting optical and electrical properties. The controlled self-assembly of electro-active nanocomposites is of great interest for the development of novel functional materials including biosensors, electrochromic/plasmonic hybrid devices, and polymer/nanoparticle-based memories.

Keywords
Conducting Polymers, Organic Electronics, Conducting Nanowires, Self- Assembly, Supramolecular Materials
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-54901 (URN)
Available from: 2010-04-20 Created: 2010-04-20 Last updated: 2010-04-20
Hamedi, M., Tvinstedt, K., Karlsson, R. H., Asberg, P. & Inganäs, O. (2009). Bridging Dimensions in Organic Electronics: Assembly of Electroactive Polymer Nanodevices from Fluids. Nano letters (Print), 9(2), 631-635
Open this publication in new window or tab >>Bridging Dimensions in Organic Electronics: Assembly of Electroactive Polymer Nanodevices from Fluids
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2009 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 9, no 2, p. 631-635Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-16960 (URN)10.1021/nl802919w (DOI)
Available from: 2009-02-28 Created: 2009-02-27 Last updated: 2017-12-13
Hamedi, M., Herlogsson, L., Crispin, X., Marcilla, R., Berggren, M. & Inganäs, O. (2009). Fiber-Embedded Electrolyte-Gated Field-Effect Transistors for e-Textiles. Advanced Materials, 21(5), 573-577
Open this publication in new window or tab >>Fiber-Embedded Electrolyte-Gated Field-Effect Transistors for e-Textiles
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2009 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 21, no 5, p. 573-577Article in journal (Refereed) Published
Abstract [en]

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.

Keywords
Conducting polymers, electronic textile, fiber transistor, field-effect transistor
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-16982 (URN)10.1002/adma.200802681 (DOI)
Available from: 2009-03-01 Created: 2009-02-27 Last updated: 2017-12-13Bibliographically approved
Karlsson, R., Herland, A., Hamedi, M., Wigenius, J., Åslund, A., Liu, X., . . . Konradsson, P. (2009). Iron-Catalyzed Polymerization of Alkoxysulfonate-Functionalized 3,4-Ethylenedioxythiophene Gives Water-Soluble Poly(3,4-ethylenedioxythiophene) of High Conductivity. Chemistry of Materials, 21(9), 1815-1821
Open this publication in new window or tab >>Iron-Catalyzed Polymerization of Alkoxysulfonate-Functionalized 3,4-Ethylenedioxythiophene Gives Water-Soluble Poly(3,4-ethylenedioxythiophene) of High Conductivity
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2009 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 21, no 9, p. 1815-1821Article in journal (Refereed) Published
Abstract [en]

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).

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2009
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-18398 (URN)10.1021/cm801512r (DOI)000265781000012 ()
Available from: 2009-05-25 Created: 2009-05-25 Last updated: 2017-12-13Bibliographically approved
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