liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Organic Bioelectronics: Electrochemical Devices using Conjugated Polymers
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Since the Nobel Prize awarded discovery that some polymers or “plastics” can be made electronically conducting, the scientific field of organic electronics has arisen. The use of conducting polymers in electronic devices is appealing, because the materials can be processed from a liquid phase, much like ordinary non-conducting plastics. This gives the opportunity to utilize printing technologies and manufacture electronics roll-to-roll on flexible substrates, ultimately at very low costs. Even more intriguing are the possibilities to achieve completely novel functionalities in combination with the inherent compatibility of these materials with biological species. Therefore, organic electronics can be merged with biology and medicine to create organic bioelectronics, i.e. organic electronic devices that interact with biological samples directly or are used for biological applications.

This thesis aims at giving a background to the field of organic bioelectronics and focuses on how electrochemical devices may be utilized. An organic electronic wettability switch that can be used for lab-on-a-chip applications and control of cell growth as well as an electrochemical ion pump for cell communication and drug delivery are introduced. Furthermore, the underlying electrochemical structures that are the basis for the above mentioned devices, electrochemical display pixels etc. are discussed in detail. In summary, the work contributes to the understanding of electrochemical polymer electronics and, by presenting new bioelectronic inventions, builds a foundation for future projects and discoveries.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap , 2007.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1128
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-9679ISBN: 978-91-85831-03-6 (print)OAI: oai:DiVA.org:liu-9679DiVA: diva2:24086
Public defence
2007-10-26, K3, Kåkenhus, Campus Norrköping, Norrköping, 10:00 (English)
Opponent
Supervisors
Available from: 2007-10-03 Created: 2007-10-03 Last updated: 2017-02-03
List of papers
1. A Solid-state Organic Electronic Wettability Switch
Open this publication in new window or tab >>A Solid-state Organic Electronic Wettability Switch
Show others...
2004 (English)In: Advanced Materials, ISSN 0935-9648, Vol. 16, no 4, 316-320 p.Article in journal (Refereed) Published
Keyword
Conjugated polymers, Electronics, Polymers, conjugated, Redox activity, Switches
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-14640 (URN)10.1002/adma.200306131 (DOI)
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03
2. Electronic Modulation of an Electrochemically induced Wettability Gradient to Control Water Movement on a Polyaniline Surface
Open this publication in new window or tab >>Electronic Modulation of an Electrochemically induced Wettability Gradient to Control Water Movement on a Polyaniline Surface
2006 (English)In: Thin Solid Films, ISSN 0040-6090, Vol. 515, no 4, 2003-2008 p.Article in journal (Refereed) Published
Abstract [en]

Wettability gradients can be electronically controlled in a multiple-electrode electrochemical structure that consists of a solid electrolyte and the conducting polymer polyaniline doped with dodecylbenzenesulfonic acid as the active surface. A bias applied directly between a counter electrode and the surface to be switched determines the initial water contact angle, while the potential between two electrodes on either side of the switch surface, connected to each other and the switch surface only through an electrolyte, induces a surface energy gradient. The spreading of water on the switchable surface can be modulated with both potentials. The wettability at each point of the switch surface is correlated to the local electrochromic state (visible color) of the material, offering a visual indication of how a water drop will spread before it is applied. This new device has potential applications in scientific areas such as micro-fluidics and biomaterials.

Keyword
Electrochemistry, Wetting, Surface energy, Organic conductor
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-14641 (URN)10.1016/j.tsf.2006.04.001 (DOI)
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03
3. Electrochemical Control of Surface Wettability of poly(3-alkylthiophenes)
Open this publication in new window or tab >>Electrochemical Control of Surface Wettability of poly(3-alkylthiophenes)
2006 (English)In: Surface Science, ISSN 0039-6028, Vol. 600, no 11, L148-L152 p.Article in journal (Refereed) Published
Abstract [en]

The effect of n-alkyl side-chain length on water contact angle with films in neutral and electrochemically doped states are studied. Increasing the side-chain from butyl to hexyl to octyl increases the contact angle of water on conjugated polymer films in both electrochemical states, but decreases the difference in angle between the states in the same film. Devices based on these films have potential application in, for example, guiding water and other liquids through microfluidic channels in lab-on-a-chip and micro-electro-mechanical (MEM) applications.

Keyword
Water contact angle, Electrochemical phenomena, Surface energy, Wetting, Conducting polymer, Solid–liquid interfaces, Organic semiconductors
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-14642 (URN)10.1016/j.susc.2006.03.039 (DOI)
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03
4. Evaluation of active materials designed for use in printable electrochromic polymer displays
Open this publication in new window or tab >>Evaluation of active materials designed for use in printable electrochromic polymer displays
Show others...
2006 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, no 4, 2485-2492 p.Article in journal (Refereed) 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.

Keyword
Electrochromic display; Conjugated polymers; Poly(3, 4-ethylenedioxythiophene)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-37443 (URN)10.1016/j.tsf.2006.07.149 (DOI)35830 (Local ID)35830 (Archive number)35830 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13
5. Electronic Control of Ca2+ Signalling in Neuronal Cells using an Organic Electronic Ion Pump
Open this publication in new window or tab >>Electronic Control of Ca2+ Signalling in Neuronal Cells using an Organic Electronic Ion Pump
Show others...
2007 (English)In: Nature Materials, ISSN 1476-1122, Vol. 6, no 9, 673-679 p.Article in journal (Refereed) Published
Abstract [en]

Cells and tissues use finely regulated ion fluxes for their intra- and intercellular communication. Technologies providing spatial and temporal control for studies of such fluxes are however, limited. We have developed an electrophoretic ion pump made of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulphonate) (PEDOT:PSS) to mediate electronic control of the ion homeostasis in neurons. Ion delivery from a source reservoir to a receiving electrolyte via a PEDOT:PSS thin-film channel was achieved by electronic addressing. Ions are delivered in high quantities at an associated on/off ratio exceeding 300. This induces physiological signalling events that can be recorded at the single-cell level. Furthermore, miniaturization of the device to a 50-um-wide channel allows for stimulation of individual cells. As this technology platform allows for electronic control of ion signalling in individual cells with proper spatial and temporal resolution, it will be useful in further studies of communication in biological systems.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-14644 (URN)10.1038/nmat1963 (DOI)
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03
6. Electronically Controlled pH Gradients and Proton Oscillations
Open this publication in new window or tab >>Electronically Controlled pH Gradients and Proton Oscillations
Show others...
2008 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 9, no 3, 303-309 p.Article in journal (Refereed) Published
Abstract [en]

An organic electronic ion pump, including poly(3,4-ethylenedioxythiophene) as the active material has been used to electronically control the transport of protons between two electrolytes and to change the pH of the target solution from 7 to 3 in a few minutes. The number of transported protons equals the time-integrated current between the two addressing electrodes. If no voltage is applied the leakage due to diffusion is not detectable, which indicates an overall proton delivery on/off ratio exceeding 1000. Locally, the pH drop can be even larger and the relationship between the proton delivery rate of the pump and proton diffusion in the electrolyte forms pH gradients. If the device is instead addressed with short pulses, local pH oscillations are created. The transport of protons presented here can be extended to other small sized ions, which in combination with the biocompatibility of the delivery surface make the device promising for cell communication studies and lab-on-a-chip applications.

Keyword
Conjugated polymer, Electronic ion pump, Ion oscillations, pH
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-14645 (URN)10.1016/j.orgel.2007.11.011 (DOI)
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-12-13

Open Access in DiVA

fulltext(1385 kB)1814 downloads
File information
File name FULLTEXT01.pdfFile size 1385 kBChecksum MD5
e4ce10d4502b54bd0d46983e1c9585f8e42b8b8c9e559e4159c3fb8c6da6663cae8cf9ac
Type fulltextMimetype application/pdf
cover(499 kB)183 downloads
File information
File name COVER01.pdfFile size 499 kBChecksum MD5
ae94094652faabd71e60eba1bec1e213b850dad414a361b9d6fbe91439893f94993d7c97
Type coverMimetype application/pdf

Authority records BETA

Isaksson, Joakim

Search in DiVA

By author/editor
Isaksson, Joakim
By organisation
Department of Science and TechnologyThe Institute of Technology
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1814 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 4264 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf