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Electronically Controlled pH Gradients and Proton Oscillations
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Karolinska Institutet.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry.ORCID iD: 0000-0002-2773-5096
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2008 (English)In: Organic electronics, ISSN 1566-1199, 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.

Place, publisher, year, edition, pages
2008. Vol. 9, no 3, 303-309 p.
Keyword [en]
Conjugated polymer, Electronic ion pump, Ion oscillations, pH
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-14645DOI: 10.1016/j.orgel.2007.11.011OAI: diva2:24085
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2015-05-06
In thesis
1. Organic Bioelectronics: Electrochemical Devices using Conjugated Polymers
Open this publication in new window or tab >>Organic Bioelectronics: Electrochemical Devices using Conjugated Polymers
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
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1128
National Category
Materials Engineering
urn:nbn:se:liu:diva-9679 (URN)978-91-85831-03-6 (ISBN)
Public defence
2007-10-26, K3, Kåkenhus, Campus Norrköping, Norrköping, 10:00 (English)
Available from: 2007-10-03 Created: 2007-10-03 Last updated: 2015-05-06

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