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- Larsson, Oscar, 1978-
(author)
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Polyelectrolyte-Based Capacitors and Transistors
- 2011
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Doctoral thesis (other academic/artistic)abstract
- Polymers are very attractive materials that can be tailored for specific needs and functionalities. Based on their chemical structure, they can for instance be made electrically insulating or semiconducting with specific mechanical properties. Polymers are often processable from a solution, which enables the use of conventional low-cost and high-volume manufacturing techniques to print electronic devices onto flexible substrates. A multitude of polymer-based electronic and electrochemical devices and sensors have been developed, of which some already has reached the consumer market.This thesis focuses on polarization characteristics in polyelectrolyte-based capacitor structures and their role in sensors, transistors and supercapacitors. The fate of the ions in these capacitor structures, within the polyelectrolyte and at the interfaces between the polyelectrolyte and various electronic conductors (a metal, a semiconducting polymer or a network of carbon nanotubes), is of outermost importance for the device function. The humidity-dependent polarization characteristics in a polyelectrolyte capacitor are used as the sensing probe for wireless readout of a passively operated humidity sensor circuit. This sensor circuit can be integrated into a printable low-cost passive sensor label. By varying the humidity level, limitations and possibilities are identified for polyelectrolyte-gated organic field-effect transistors. Further, the effect of the ionic conductivity is investigated for polyelectrolyte-based supercapacitors. Finally, by using an ordinary electrolyte instead of a polyelectrolyte and a high-surface area (supercapacitor) gate electrode, the device mechanisms proposed for electrolyte-gated organic transistors are unified.
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- Larsson, Oscar, 1978-, et al.
(author)
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Proton motion in a polyelectrolyte : A probe for wireless humidity sensors
- 2010
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In: Sensors and actuators. B, Chemical. - : Elsevier / ScienceDirect. - 0925-4005 .- 1873-3077. ; 143:2, s. 482-486
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Journal article (peer-reviewed)abstract
- Low-cost passive wireless electronic sensor labels glued onto packages are highly desirable since they enable monitoring of the status of the packages for instance along the logistic chain or while stored at a shelf. Such additional sensing feature would be of great value for many producers and vendors, active in e.g. the food or construction industries. Here, we explore a novel concept for wireless sensing and readout, in which the humidity sensitive ionic motion in a polyelectrolyte membrane is directly translated into a shift of the resonance frequency of a resonance circuit. Thanks to its simplicity, the wireless sensor device itself can be manufactured entirely using common printing techniques and can be integrated into a low-cost passive electronic sensor label.
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- Larsson, Oscar, 1978-
(author)
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Sovereign power beyond the state : A critical reappraisal of governance by networks
- 2013
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In: Critical Policy Studies. - Abingdon, Oxon : Routledge. - 1946-0171 .- 1946-018X. ; 7:2, s. 99-114
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Journal article (peer-reviewed)abstract
- This article argues that existent critique against the discourse and practice of governance by networks fails to consider the more substantial political challenges that such a style of governance generates. By not addressing the depoliticization claims present in the discourse of governance by networks there is a continuation of the seemingly attractive solution and possibility for states to perform metagovernance of networks. Such suggestions have, however, overlooked the instability of networks and the politics of politics that this form of organization entails. By making use of a retheorization of sovereign power and its double relationship to public political space, it is argued that new insights can be gained with regards to the role of networks in contemporary politics. This retheorization suggests that sovereign power is present when decisions are made both on the political nature of issues and on whether accountability to the wider public should apply. Thus, contrary to the claim that sovereign power is declining as networks get involved in public affairs, it is argued here that such power is even more present due to an increased uncertainty of political boundaries that arise in the implementation and maintenance of new governing structures.
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