liu.seSök publikationer i DiVA
Ändra sökning
Avgränsa sökresultatet
1 - 12 av 12
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Andersson, Peter
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Forchheimer, Robert
    Linköpings universitet, Institutionen för systemteknik. Linköpings universitet, Tekniska högskolan.
    Tehrani, Payman
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Berggren, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Printable All-Organic Electrochromic Active-Matrix Displays2007Ingår i: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 17, nr 16, s. 3074-3082Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    All-organic active matrix addressed displays based on electrochemical smart pixels made on flexible substrates are reported. Each individual smart pixel device combines an electrochemical transistor with an electrochromic display cell, thus resulting in a low-voltage operating and robust display technology. Poly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly(styrenesulfonate) (PSS) served as the active material in the electrochemical smart pixels, as well as the conducting lines, of the monolithically integrated active-matrix display. Different active-matrix display addressing schemes have been investigated and a matrix display fill factor of 65 % was reached. This is achieved by combining a three-terminal electrochemical transistor with an electrochromic display cell architecture, in which an additional layer of PEDOT:PSS was placed on top of the display cell counter electrode. In addition, we have evaluated different kinds of electrochromic polymer materials aiming at reaching a high color switch contrast. This work has been carried out in the light of achieving a robust display technology that is easily manufactured using a standard label printing press, which forced us to use the fewest different materials as well as avoiding exotic and complex device architectures. Together, this yields a manufacturing process of only five discrete patterning steps, which in turn promise for that the active matrix addressed displays can be manufactured on paper or plastic substrates in a roll-to-roll production procedure.

  • 2.
    Andersson, Peter
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Tehrani, Payman
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Forchheimer, Robert
    Linköpings universitet, Institutionen för systemteknik.
    Nilsson, David
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Robinson, Nathaniel D
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Berggren, Magnus
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    All-Organic Active Matrix Addressed Displays Based on Electrochromic Polymers and Flexible Substrate2005Ingår i: MRS Fall Meeting,2005, 2005Konferensbidrag (Refereegranskat)
  • 3.
    Berggren, Magnus
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
    Nilsson, David
    Acreo AB, Sweden.
    Andersson Ersman, Peter
    Acreo AB, Sweden.
    Tehrani, Payman
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Hennerdal, Lars-Olov
    Acreo AB, Sweden.
    Electrochromic Displays2010Ingår i: Iontronic: Ionic Carriers in Organic Electronic Materials and Devices / [ed] Janelle Leger, Magnus Berggren, Sue Carter, Boca Raton: CRC Press; Taylor & Francis Group , 2010, s. 131-139Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    The field of organic electronics promises exciting new technologies based on inexpensive and mechanically flexible electronic devices. It has progressed over the past three decades to the point of commercial viability and is projected to grow to a 30 billion dollar market by the year 2015. Exploring new applications and device architectures, this book sets the tone for that exploration, gathering a community of experts in this area who are focused on the use of ionic functions to define the principle of operation in polymer devices. The contributors detail relevant technologies based on organic electronics, including polymer electrochromic devices and light-emitting electrochemical cells.

  • 4. Beställ onlineKöp publikationen >>
    Tehrani, Payman
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Electrochemical Switching in Conducting Polymers – Printing Paper Electronics2008Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    Dagligen kommer vi i kontakt med olika plastmaterial. Dessa har vanligtvis mycket dålig elektrisk ledningsförmåga och används oftast som isolerande material. Det finns dock en klass av plaster som är halvledande eller ledande. Sedan upptäckten av dessa material för mer än 30 år sedan har nya material och användningsområden utvecklats och nu börjar de första produkterna baserad på organisk elektronik komma ut på marknaden. En stor fördel med de ledande plasterna är att egenskaperna kan anpassas genom att ändra den kemiska strukturen. Man kan dessutom lösa upp dem och skapa ledande bläck, som sedan kan användas i vanliga tryckmaskiner. Detta gör det möjligt att på ett enkelt och billigt sätt tillverka elektronik på liknande sätt som till exempel tidningar trycks idag.

    Den här avhandlingen behandlar en del av det nya området som berör elektrokemiska komponenter och några av dess tillämpningar. Fokus ligger främst på billig, tryckt elektronik. Bland annat presenteras ett sätt att fördubbla kontrasten för tryckta pappersdisplayer, ett nytt sätt att mönstra ledande plaster och elektrokemisk temperaturloggningsetikett som kan övervaka temperaturen för förpackningar under transport. Den mekanism som förstör ledningsförmågan vid höga spänningar har varit ett återkommande inslag i de studier som har genomförts här. Denna mekanism förstör komponenterna under drift men kan också användas för att ta bort ledningsförmågan som mönstringsmetod eller för att lagra information, permanent, i temperaturloggningsetiketten.

    Delarbeten
    1. Patterning polythiophene films using electrochemical over-oxidation
    Öppna denna publikation i ny flik eller fönster >>Patterning polythiophene films using electrochemical over-oxidation
    Visa övriga...
    2005 (Engelska)Ingår i: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 14, s. N21-N25Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Over-oxidative degradation of polythiophenes, which breaks the conjugation and destroys the electronic conductivity of the polymer, is well documented as a liability in these materials. We use this 'weakness', via controlled electrochemical over-oxidation, in a novel subtractive patterning technique compatible with high-speed reel-to-reel printing technology. We demonstrate the use of electrochemical over-oxidation to pattern PEDOT:PSS films via an x–y plotter, silk-screen and high-resolution photolithographic techniques, resulting in patterning down to a resolution of 2 µm and a conduction contrast between unpatterned and patterned areas of up to 108.

    Ort, förlag, år, upplaga, sidor
    IOP Elctronic Journals, 2005
    Nyckelord
    Not Available.
    Nationell ämneskategori
    Oorganisk kemi
    Identifikatorer
    urn:nbn:se:liu:diva-14024 (URN)10.1088/0964-1726/14/4/N03 (DOI)
    Tillgänglig från: 2008-11-12 Skapad: 2008-10-17 Senast uppdaterad: 2019-12-29Bibliografiskt granskad
    2. The effect of pH on the elechtrochemical over-oxidation of PEDOT:PSS films
    Öppna denna publikation i ny flik eller fönster >>The effect of pH on the elechtrochemical over-oxidation of PEDOT:PSS films
    Visa övriga...
    2007 (Engelska)Ingår i: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 177, nr 39-40, s. 3521-3527Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Chemical degradation of conjugated polymers is one cause of material failures in polymer-based (opto)electronic devices, but can also be used as a technique for subtractive patterning of polymer films. When a large anodic potential is applied to the conducting polymer blend poly(3,4-ethylenedioxythiophene)-poly(4styrenesulfonate), PEDOT:PSS, an over-oxidation reaction occurs, altering its electrical conductivity. Here, we have studied the effect of pH on the electrochemical over-oxidation process of PEDOT in PEDOT:PSS. High pH is associated with a decrease of over-oxidation potential and an increase of resistivity in the resulting film. Vibrational spectroscopy and photoelectron spectroscopy measurements on over-oxidized PEDOT:PSS films indicate that the decrease in conductivity results from cleavage of the conjugation pathway accompanied by the formation of sulfone, carbonyl and carboxylic groups in the polymer chain.

    Ort, förlag, år, upplaga, sidor
    ScienceDirect, 2007
    Nyckelord
    Poly(3, 4-ethylenedioxythiophene), Degradation, Over-oxidation, XPS, FTIR, Conjugated polymer, Polythiophenes
    Nationell ämneskategori
    Oorganisk kemi
    Identifikatorer
    urn:nbn:se:liu:diva-14026 (URN)10.1016/j.ssi.2006.10.008 (DOI)
    Tillgänglig från: 2008-11-12 Skapad: 2008-10-17 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
    3. Evaluation of active materials designed for use in printable electrochromic polymer displays
    Öppna denna publikation i ny flik eller fönster >>Evaluation of active materials designed for use in printable electrochromic polymer displays
    Visa övriga...
    2006 (Engelska)Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, nr 4, s. 2485-2492Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    In a step towards roll-to-roll production of polymer-based electrochromic displays on flexible substrates, nine thiophene-based polymers and copolymers designed to increase the contrast of displays based on poly(3,4-ethylenedioxythiophene)/poly(styrene-sulfonic acid) have been synthesized and evaluated with respect to their absorbance (contrast), switch speed, and ability to switch reversibly in a water-based electrolyte. The results of the evaluation, including cyclic voltammetry and optically visible absorption, provide a basis for understanding what an aqueous electrolyte electrochromic display requires in terms of oxidation potential and material stability, and the effect of chemical structure on the reversibility and speed of switching. © 2006 Elsevier B.V. All rights reserved.

    Nyckelord
    Electrochromic display; Conjugated polymers; Poly(3, 4-ethylenedioxythiophene)
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-37443 (URN)10.1016/j.tsf.2006.07.149 (DOI)35830 (Lokalt ID)35830 (Arkivnummer)35830 (OAI)
    Tillgänglig från: 2009-10-10 Skapad: 2009-10-10 Senast uppdaterad: 2017-12-13
    4. Improving the contrast of all-printed electrochromic polymer on paper displays
    Öppna denna publikation i ny flik eller fönster >>Improving the contrast of all-printed electrochromic polymer on paper displays
    Visa övriga...
    2009 (Engelska)Ingår i: JOURNAL OF MATERIALS CHEMISTRY, ISSN 0959-9428 , Vol. 19, nr 13, s. 1799-1802Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    PEDOT:PSS-based electrochromic displays have been explored for manufacture on flexible paper substrates in roll-to-roll printing presses at high volumes and low costs. Here, we report the improvement of the optical contrast of such devices by adding an extra layer of a dihexyl-substituted poly(3,4-propylenedioxythiophene) (PProDOT-Hx2) to complement the optical absorption spectrum of PEDOT: PSS. The oxidized state of PProDOT-Hx2 is highly transparent and is an intense magenta color while in the reduced state. By adding a layer of PProDOT-Hx2 directly on top of PEDOT: PSS, we were able to improve the optical contrast by nearly a factor of two. In this report, we present optical and electrochemical data of PProDOT-Hx2/PEDOT: PSS-based electrochromic paper displays and compare their performance with PEDOT: PSS-only equivalents.

    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-17504 (URN)10.1039/b820677e (DOI)
    Tillgänglig från: 2009-03-27 Skapad: 2009-03-27 Senast uppdaterad: 2017-02-03
    5. Printable organic temperature logger based on overoxidation front propagation in PEDOT:PSS
    Öppna denna publikation i ny flik eller fönster >>Printable organic temperature logger based on overoxidation front propagation in PEDOT:PSS
    Visa övriga...
    (Engelska)Manuskript (Övrigt vetenskapligt)
    Abstract [en]

    An electrochemical temperature logger has been realized by using the propagation of overoxidation fronts in stripes of poly(3,4-ethylenedioxythiopehene) blended with poly(styrenesulfonate) (PEDOT:PSS). The over-oxidation front propagation has been characterized and related to the ionic conductivity of polyethylene glycol (PEG) electrolytes. The electrolytes were chosen to have a phase transition in the temperature interval to be monitored, resulting in large conductivity variations and thereby an easily interpreted output. A logger demonstrator has been fabricated and shown to detect a temperature increase and a following temperature decrease. This very simple device is cheap to produce and could be used to monitor the temperature of packages.

    Nyckelord
    Not available.
    Nationell ämneskategori
    Oorganisk kemi
    Identifikatorer
    urn:nbn:se:liu:diva-15129 (URN)
    Tillgänglig från: 2008-11-12 Skapad: 2008-10-17 Senast uppdaterad: 2017-02-03Bibliografiskt granskad
  • 5.
    Tehrani, Payman
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Electrochromism and over-oxidation in conjugated polymers: Improved color switching and a novel patterning approach2006Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    During the last 30 years a new research and technology field of organic electronic materials has grown thanks to a groundbreaking discovery made during the late 70’s. This new field is today a worldwide research effort focusing on exploring this new class of materials that also enable many new areas of electronics applications. In the organic electronics research field conducting organic molecules and polymers are synthesized and used in devices. The reason behind the success of conducting polymers is the flexibility to develop materials with new functionalities via clever chemical design and the possibility to use low-cost production techniques to manufacture devices.

    This thesis reviews and describes different aspects of the organic electronics, here focusing on electrochromic displays; device improvements, the study of degradation and also patterning technology for rational manufacturing processing. The color contrast in electrochromic displays based on conjugated polymers was increased with approximately a factor of two by adding an extra electrochromic polymer. It was found that electrochemical over-oxidation (ECO) limits the flexibility in choosing desired electrochromic materials. ECO is one of the main degradation mechanisms in electrochromic displays. ECO is an efficient and fast process to permanently reduce the electronic conductivity in polythiophenes. From this, a novel patterning process was developed, in which the films of polythiophenes can be patterned through local and controlled deactivation of the conductivity. The ECO has been combined with different patterning tools to enable the use of existing printing tools for manufacturing. In combination with screen-printing, low-cost and high volume roll-to-roll patterning was demonstrated, while together with photolithography, patterning down to 2 µm can be achieved. Systematic studies have shown that conductivity contrasts beyond 107 can be achieved, which is enough for various simple electronic systems. To generate better understanding of the ECO phenomena the effect of pH on the over-oxidation characteristics was studied. The results suggest that a part of the mechanism for over-oxidation depends on the OH– concentration of the electrolyte used.

    Delarbeten
    1. Patterning polythiophene films using electrochemical over-oxidation
    Öppna denna publikation i ny flik eller fönster >>Patterning polythiophene films using electrochemical over-oxidation
    Visa övriga...
    2005 (Engelska)Ingår i: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 14, s. N21-N25Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Over-oxidative degradation of polythiophenes, which breaks the conjugation and destroys the electronic conductivity of the polymer, is well documented as a liability in these materials. We use this 'weakness', via controlled electrochemical over-oxidation, in a novel subtractive patterning technique compatible with high-speed reel-to-reel printing technology. We demonstrate the use of electrochemical over-oxidation to pattern PEDOT:PSS films via an x–y plotter, silk-screen and high-resolution photolithographic techniques, resulting in patterning down to a resolution of 2 µm and a conduction contrast between unpatterned and patterned areas of up to 108.

    Ort, förlag, år, upplaga, sidor
    IOP Elctronic Journals, 2005
    Nyckelord
    Not Available.
    Nationell ämneskategori
    Oorganisk kemi
    Identifikatorer
    urn:nbn:se:liu:diva-14024 (URN)10.1088/0964-1726/14/4/N03 (DOI)
    Tillgänglig från: 2008-11-12 Skapad: 2008-10-17 Senast uppdaterad: 2019-12-29Bibliografiskt granskad
    2. Evaluation of active materials designed for use in printable electrochromic polymer displays
    Öppna denna publikation i ny flik eller fönster >>Evaluation of active materials designed for use in printable electrochromic polymer displays
    Visa övriga...
    2006 (Engelska)Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, nr 4, s. 2485-2492Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    In a step towards roll-to-roll production of polymer-based electrochromic displays on flexible substrates, nine thiophene-based polymers and copolymers designed to increase the contrast of displays based on poly(3,4-ethylenedioxythiophene)/poly(styrene-sulfonic acid) have been synthesized and evaluated with respect to their absorbance (contrast), switch speed, and ability to switch reversibly in a water-based electrolyte. The results of the evaluation, including cyclic voltammetry and optically visible absorption, provide a basis for understanding what an aqueous electrolyte electrochromic display requires in terms of oxidation potential and material stability, and the effect of chemical structure on the reversibility and speed of switching. © 2006 Elsevier B.V. All rights reserved.

    Nyckelord
    Electrochromic display; Conjugated polymers; Poly(3, 4-ethylenedioxythiophene)
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-37443 (URN)10.1016/j.tsf.2006.07.149 (DOI)35830 (Lokalt ID)35830 (Arkivnummer)35830 (OAI)
    Tillgänglig från: 2009-10-10 Skapad: 2009-10-10 Senast uppdaterad: 2017-12-13
    3. The effect of pH on the elechtrochemical over-oxidation of PEDOT:PSS films
    Öppna denna publikation i ny flik eller fönster >>The effect of pH on the elechtrochemical over-oxidation of PEDOT:PSS films
    Visa övriga...
    2007 (Engelska)Ingår i: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 177, nr 39-40, s. 3521-3527Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Chemical degradation of conjugated polymers is one cause of material failures in polymer-based (opto)electronic devices, but can also be used as a technique for subtractive patterning of polymer films. When a large anodic potential is applied to the conducting polymer blend poly(3,4-ethylenedioxythiophene)-poly(4styrenesulfonate), PEDOT:PSS, an over-oxidation reaction occurs, altering its electrical conductivity. Here, we have studied the effect of pH on the electrochemical over-oxidation process of PEDOT in PEDOT:PSS. High pH is associated with a decrease of over-oxidation potential and an increase of resistivity in the resulting film. Vibrational spectroscopy and photoelectron spectroscopy measurements on over-oxidized PEDOT:PSS films indicate that the decrease in conductivity results from cleavage of the conjugation pathway accompanied by the formation of sulfone, carbonyl and carboxylic groups in the polymer chain.

    Ort, förlag, år, upplaga, sidor
    ScienceDirect, 2007
    Nyckelord
    Poly(3, 4-ethylenedioxythiophene), Degradation, Over-oxidation, XPS, FTIR, Conjugated polymer, Polythiophenes
    Nationell ämneskategori
    Oorganisk kemi
    Identifikatorer
    urn:nbn:se:liu:diva-14026 (URN)10.1016/j.ssi.2006.10.008 (DOI)
    Tillgänglig från: 2008-11-12 Skapad: 2008-10-17 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
  • 6.
    Tehrani, Payman
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Engquist, Isak
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Robinson, Nathaniel D.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Nilsson, David
    Acreo AB, Bredgatan 34, SE-601 21 Norrköping, Sweden.
    Robertsson, Mats
    Acreo AB, Bredgatan 34, SE-601 21 Norrköping, Sweden.
    Berggren, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Printable organic temperature logger based on overoxidation front propagation in PEDOT:PSSManuskript (Övrigt vetenskapligt)
    Abstract [en]

    An electrochemical temperature logger has been realized by using the propagation of overoxidation fronts in stripes of poly(3,4-ethylenedioxythiopehene) blended with poly(styrenesulfonate) (PEDOT:PSS). The over-oxidation front propagation has been characterized and related to the ionic conductivity of polyethylene glycol (PEG) electrolytes. The electrolytes were chosen to have a phase transition in the temperature interval to be monitored, resulting in large conductivity variations and thereby an easily interpreted output. A logger demonstrator has been fabricated and shown to detect a temperature increase and a following temperature decrease. This very simple device is cheap to produce and could be used to monitor the temperature of packages.

  • 7.
    Tehrani, Payman
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Engquist, Isak
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Robinson, Nathaniel D
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ytors Fysik och Kemi. Linköpings universitet, Tekniska högskolan.
    Nilsson, David
    Acreo AB.
    Robertsson, Mats
    Acreo AB.
    Berggren, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Printable organic electrochemical circuit to record time-temperature history2010Ingår i: ELECTROCHIMICA ACTA, ISSN 0013-4686, Vol. 55, nr 23, s. 7061-7066Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An electrochemical circuit to record time-temperature history has been realized by using the propagation of over-oxidation fronts in stripes of poly(3,4-ethylenedioxythiopehene) blended with poly(styrenesulfonate) (PEDOT:PSS). The over-oxidation front propagation has been characterized and related to the phase change of polyethylene glycol (PEG) electrolytes. The electrolytes were chosen to have a phase transition in the temperature interval to be monitored, resulting in large conductivity variations and thereby an easily interpreted output. A demonstrator has been fabricated and shown to detect a temperature increase and a following temperature decrease. This very simple device is cheap to produce and could be used to monitor the temperature of packages.

  • 8.
    Tehrani, Payman
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Hennerdal, Lars-Olov
    Acreo AB.
    Dyer, Aubrey L
    University of Florida.
    Reynolds, John R
    University of Florida.
    Berggren , Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Improving the contrast of all-printed electrochromic polymer on paper displays2009Ingår i: JOURNAL OF MATERIALS CHEMISTRY, ISSN 0959-9428 , Vol. 19, nr 13, s. 1799-1802Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    PEDOT:PSS-based electrochromic displays have been explored for manufacture on flexible paper substrates in roll-to-roll printing presses at high volumes and low costs. Here, we report the improvement of the optical contrast of such devices by adding an extra layer of a dihexyl-substituted poly(3,4-propylenedioxythiophene) (PProDOT-Hx2) to complement the optical absorption spectrum of PEDOT: PSS. The oxidized state of PProDOT-Hx2 is highly transparent and is an intense magenta color while in the reduced state. By adding a layer of PProDOT-Hx2 directly on top of PEDOT: PSS, we were able to improve the optical contrast by nearly a factor of two. In this report, we present optical and electrochemical data of PProDOT-Hx2/PEDOT: PSS-based electrochromic paper displays and compare their performance with PEDOT: PSS-only equivalents.

  • 9.
    Tehrani, Payman
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Isaksson, Joakim
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Mammo, W.
    Department of Materials and Surface Chemistry/Polymer Technology Chalmers University of Technology.
    Andersson, M.R.
    Department of Materials and Surface Chemistry/Polymer Technology Chalmers University of Technology.
    Robinson, Nathaniel D
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Berggren, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Evaluation of active materials designed for use in printable electrochromic polymer displays2006Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, nr 4, s. 2485-2492Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In a step towards roll-to-roll production of polymer-based electrochromic displays on flexible substrates, nine thiophene-based polymers and copolymers designed to increase the contrast of displays based on poly(3,4-ethylenedioxythiophene)/poly(styrene-sulfonic acid) have been synthesized and evaluated with respect to their absorbance (contrast), switch speed, and ability to switch reversibly in a water-based electrolyte. The results of the evaluation, including cyclic voltammetry and optically visible absorption, provide a basis for understanding what an aqueous electrolyte electrochromic display requires in terms of oxidation potential and material stability, and the effect of chemical structure on the reversibility and speed of switching. © 2006 Elsevier B.V. All rights reserved.

  • 10.
    Tehrani, Payman
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Kanciurzewska, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Crispin, Xavier
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Robinson, Nathaniel D.
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ytors Fysik och Kemi. Linköpings universitet, Tekniska högskolan.
    Fahlman, Mats
    Linköpings universitet, Institutionen för fysik, kemi och biologi, Ytors Fysik och Kemi. Linköpings universitet, Tekniska högskolan.
    Berggren, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    The effect of pH on the elechtrochemical over-oxidation of PEDOT:PSS films2007Ingår i: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 177, nr 39-40, s. 3521-3527Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Chemical degradation of conjugated polymers is one cause of material failures in polymer-based (opto)electronic devices, but can also be used as a technique for subtractive patterning of polymer films. When a large anodic potential is applied to the conducting polymer blend poly(3,4-ethylenedioxythiophene)-poly(4styrenesulfonate), PEDOT:PSS, an over-oxidation reaction occurs, altering its electrical conductivity. Here, we have studied the effect of pH on the electrochemical over-oxidation process of PEDOT in PEDOT:PSS. High pH is associated with a decrease of over-oxidation potential and an increase of resistivity in the resulting film. Vibrational spectroscopy and photoelectron spectroscopy measurements on over-oxidized PEDOT:PSS films indicate that the decrease in conductivity results from cleavage of the conjugation pathway accompanied by the formation of sulfone, carbonyl and carboxylic groups in the polymer chain.

  • 11.
    Tehrani, Payman
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Remonen, Tommie
    Acreo AB, Norrköping.
    Hennerdal, Lars-Olov
    Acreo AB, Norrköping.
    Malmström, Anna
    Acreo AB, Norrköping.
    Häll, Jessica
    ITN Fysik och elektroteknik.
    Nilsson, David
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Leenders, Luc
    Agfa-Gevaert NV, Mortsel, Belgium.
    Kugler, Thomas
    Acreo AB, Norrköping.
    Berggren, Magnus
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Electrochemical Patterning of Conducting Polymer Layers: A Novel Technology for "Printing" Polymer Electronic Devices2002Ingår i: Material Research Society Spring Meeting,2002, 2002Konferensbidrag (Refereegranskat)
  • 12.
    Tehrani, Payman
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Robinson, Nathaniel D.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Kugler, Thomas
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Remonen, Tommi
    Acreo AB, Bredgatan 34, SE-602 21 Norrköping, Sweden.
    Hennerdal, Lars-Olov
    Acreo AB, Bredgatan 34, SE-602 21 Norrköping, Sweden.
    Häll, Jessica
    Acreo AB, Bredgatan 34, SE-602 21 Norrköping, Sweden.
    Malmström, Anna
    Acreo AB, Bredgatan 34, SE-602 21 Norrköping, Sweden.
    Leenders, Luc
    AGFA-Gevaert NV, Septestraat 27, B-2640 Mortsel, Belgium.
    Berggren, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Patterning polythiophene films using electrochemical over-oxidation2005Ingår i: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 14, s. N21-N25Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Over-oxidative degradation of polythiophenes, which breaks the conjugation and destroys the electronic conductivity of the polymer, is well documented as a liability in these materials. We use this 'weakness', via controlled electrochemical over-oxidation, in a novel subtractive patterning technique compatible with high-speed reel-to-reel printing technology. We demonstrate the use of electrochemical over-oxidation to pattern PEDOT:PSS films via an x–y plotter, silk-screen and high-resolution photolithographic techniques, resulting in patterning down to a resolution of 2 µm and a conduction contrast between unpatterned and patterned areas of up to 108.

1 - 12 av 12
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf