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Phospholipid film in electrolyte-gated organic field-effect transistors
Università di Bari “Aldo Moro”.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Università di Bari “Aldo Moro”.
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2012 (English)In: Organic electronics, ISSN 1566-1199, Vol. 13, no 4, 638-644 p.Article in journal (Refereed) Published
Abstract [en]

A totally innovative electrolyte-gated field effect transistor, embedding a phospholipid film at the interface between the organic semiconductor and the gating solution, is described. The electronic properties of OFETs including a phospholipid film are studied in both pure water and in an electrolyte solution and compared to those of an OFET with the organic semiconductor directly in contact with the gating solution. In addition, to investigate the role of the lipid layers in the charge polarization process and quantify the field-effect mobility, impedance spectroscopy was employed. The results indicate that the integration of the biological film minimizes the penetration of ions into the organic semiconductor thus leading to a capacitive operational mode as opposed to an electrochemical one. The OFETs operate at low voltages with a field-effect mobility in the 10−3 cm2 V−1 s−1 range and an on/off current ratio of 103. This achievement opens perspectives to the development of FET biosensors potentially capable to operate in direct contact with physiological fluids.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 13, no 4, 638-644 p.
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-74742DOI: 10.1016/j.orgel.2012.01.002ISI: 000300846200015OAI: diva2:491660
funding agencies|European Union| 248728 |Available from: 2012-02-07 Created: 2012-02-07 Last updated: 2015-10-07
In thesis
1. Operating Organic Electronics via Aqueous Electric Double Layers
Open this publication in new window or tab >>Operating Organic Electronics via Aqueous Electric Double Layers
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The field of organic electronics emerged in the 1970s with the discovery of conducting polymers. With the introduction of plastics as conductors and semiconductors came many new possibilities both in production and function of electronic devices. Polymers can often be processed from solution and their softness provides both the possibility of working on flexible substrates, and various advantages in interfacing with other soft materials, e.g. biological samples and specimens. Conducting polymers readily partake in chemical and electrochemical reactions, providing an opportunity to develop new electrochemicallydriven devices, but also posing new problems for device engineers.

The work of this thesis has focused on organic electronic devices in which aqueous electrolytes are an active component, but still operating in conditions where it is desirable to avoid electrochemical reactions. Interfacing with aqueous electrolytes occurs in a wide variety of settings, but we have specifically had biological environments in mind as they necessarily involve the presence of water. The use of liquid electrolytes also provides the opportunity to deliver and change the device electrolyte continuously, e.g. through microfluidic systems, which could then be used as a dynamic feature and/or be used to introduce and change analytes for sensors. Of particular interest is the electric double layer at the interface between the electrolyte and other materials in the device,  specifically its sensitivity to charge reorganization and high capacitance.

The thesis first focuses on organic field effect transistors gated through aqueous electrolytes. These devices are proposed as biosensors with the transistor architecture providing a direct transduction and amplification so that it can be electrically read out. It is discussed both how to distinguish between the various operating mechanisms in electrolyte thin film transistors and how to choose a strategy to achieve the desired mechanism. Two different strategies to suppress ion penetration into, and thus electrochemical doping of, the organic semiconductor are presented.

The second focus of the thesis is on polarization of ferroelectric polymer films through electrolytes. A model for the interaction between the remnant ferroelectric charge in the polymer film and the mobile ionic charges of the electrolyte is presented, and verified experimentally. The reorientation of the ferroelectric polarization via the electric double layer is also demonstrated in a regenerative medicine application; the ferroelectric polarization is shown to affect cell binding, and is used as a gentle method to nondestructively detach cells from a culture substrate.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 61 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1704
National Category
Physical Sciences Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:liu:diva-121805 (URN)10.3384/diss.diva-121805 (DOI)978-91-7685-944-5 (print) (ISBN)
Public defence
2015-11-09, K3, Kåkenhus, Campus Norrköping, Norrköping, 14:00
Available from: 2015-10-07 Created: 2015-10-07 Last updated: 2015-10-12Bibliographically approved

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