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Printed low loss capacitors for use in a wireless humidity sensor label
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Acreo AB, Norrköping, Sweden.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-8845-6296
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-5365-6140
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

A low loss printed capacitor is achieved by using a screen printable benzocyclobutene-based solution. The dissipation factor is measured to be 0.001 at frequencies around 3 MHz, which is low compared to commercially available dielectric inks with dissipation factors of ~0.05 in the same frequency region. By incorporating low loss printed capacitors with a planar antenna and a printed humidity sensor capacitor, a humidity sensor label which resonates at 3 MHz is demonstrated. The label is fully printed on a flexible substrate pre-patterned with the antenna and the manufacturing process is compatible with low-cost reelto-reel processing technology. The quality factor (Q factor) of the sensor label is enhanced up to about 15 in ambient environment. This allows readout of the sensor response at a distance and through damping materials such as walls in a building.

Keyword [en]
Printed humidity sensor label;
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-97350OAI: oai:DiVA.org:liu-97350DiVA: diva2:647093
Available from: 2013-09-10 Created: 2013-09-10 Last updated: 2017-02-03Bibliographically approved
In thesis
1. Controlling ion transport in organic devices
Open this publication in new window or tab >>Controlling ion transport in organic devices
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic electronics and printed electronics have been attracting more and more research interest in the past decades. Polymers constitute an important class of materials within the field organic electronics due to their unique physical and chemical properties. One great benefit of the polymers is their solution processability, which provides us the possibility to utilize conventional printing techniques to fabricate devices on flexible substrates.

This thesis focuses on utilizing and controlling the ion transport in polyelectrolytes in electronic devices for different applications. A polyelectrolyte is a polymer in which the polymeric backbone includes ionic sites compensated by counter ions.

Firstly, we have used a specific property of the polyelectrolyte: its electric polarization is strongly dependent on the humidity level. The ions are screened by water molecules; this improves the mobility and dissociation of ions. A polyelectrolyte-based capacitor is thus ideal to sense humidity. Such a capacitor is integrated into an LC resonant circuit possessing a specific resonant frequency. The wirelessly detected resonant frequencies of the sensing circuit indicate the corresponding humidity levels. With the appropriate choice of materials, the complete sensing circuit (resistor, capacitor, capacitor-like sensor head) can be screen-printed on an antenna manufactured using a roll-to-roll dry phase patterning technique.

Secondly, we have modified the polarization characteristics of ions in a polyelectrolyte layer by trapping the ions in molecular macrocycles dispersed in a polymer overlayer. The resulting remanent polarization is read out as a hysteresis loop in the capacitance-voltage characteristic of a capacitor. The strategy is further implemented in an electrolyte-gated organic transistor to control its threshold voltage by applying defined programming voltages. Although the lifetime of the “remanent” polarization is rather short, the concept might be further improved to fit those of memory applications.

Finally, we take use of the ionic selectivity of a polyelectrolyte to stabilize the operation of a water-gated organic field-effect transistor. The polyanionic membrane is added onto the semiconductor channel to prevent small anions of the aqueous electrolyte to penetrate into the p-channel semiconductor. Moreover, the polyelectrolyte layer protects the semiconductor and thus strongly stabilizes the shelf lifetime of those transistors. This improved version of the water-gated organic transistor is a candidate for developing transistor-based sensors working in, for instance, biological media.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 66 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1536
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-97353 (URN)978-91-7519-547-6 (ISBN)
Public defence
2013-09-18, Resursen, Pronova Norrköping konferens, St Persgatan 19, Norrköping, 10:15 (English)
Supervisors
Available from: 2013-09-10 Created: 2013-09-10 Last updated: 2017-02-03Bibliographically approved

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Wang, XiaodongCrispin, XavierEngquist, IsakBerggren, Magnus

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